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[ Daily / Weekly / Overview ]

Apr 25, 2025

Zero-trust Network / Identifiers

heimdall (⭐182) - A cloud-native, identity-aware proxy and policy enforcement point that orchestrates authentication and authorization systems via versatile rules, supporting protocol-agnostic identity propagation.

Aug 26, 2024

Authorization / Policy models

Service-to-service authorization: A guide to non-user principals - Discover how assigning identities to services (non-user principals) can simplify authentication, enhance security, and streamline authorization in complex distributed systems. A useful guide for IAM teams managing microservices and APIs.

Authorization / ReBAC frameworks

Permify (⭐5.4k) - Another open-source authorization as a service inspired by Google Zanzibar, and see how it compares to other Zanzibar-inspired tools.

Authorization / AWS policy tools

An AWS IAM Security Tooling Reference - A comprehensive list of (maintained) tools for AWS IAM.

Authorization / Other tools

Gubernator (⭐127) - High performance rate-limiting micro-service and library.

OAuth2 & OpenID / Other tools

How to Implement a Secure Central Authentication Service in Six Steps - Got multiple legacy systems to merge with their own login methods and accounts? Here is how to merge all that mess by the way of OIDC.

Authgear (⭐91) - Open-source authentication-as-a-service solution. It includes the code for the server, AuthUI, the Portal, and Admin API.

Trust & Safety / User Identity

Facebook Dangerous Individuals and Organizations List - Some groups and content are illegal in some juridictions. This is an example of a blocklist.

Dec 12, 2023

Authorization / Policy models

Authorization Academy - An in-depth, vendor-agnostic treatment of authorization that emphasizes mental models. This guide shows the reader how to think about their authorization needs in order to make good decisions about their authorization architecture and model.

Oct 27, 2023

Password-less auth / WebAuthn

Clearing up some misconceptions about Passkeys - Or why passkeys are not worse than passwords.

Authorization / Policy models

GCP's IAM syntax is better than AWS's - The minutiae of permission design in GCP improves the developer's experience.

Authorization / ReBAC frameworks

Warrant (⭐1.3k) - A relationship based access control (ReBAC) engine (inspired by Google Zanzibar) also capable of enforcing any authorization paradigm, including RBAC and ABAC.

Secret Management / Other tools

HashiCorp Vault - Secure, store and tightly control access to tokens, passwords, certificates, encryption keys.

Infisical (⭐18k) - An alternative to HashiCorp Vault.

Jun 27, 2023

OAuth2 & OpenID / Other tools

The problem with OAuth for Authentication - “The problem is that OAuth 2.0 is a Delegated Authorization protocol, and not a Authentication protocol.” 10 years after, this article is still the best explanation on why use OpenID Connect instead of plain OAuth2?

Jun 14, 2023

SAML / Other tools

SAML vs. OAuth - “OAuth is a protocol for authorization: it ensures Bob goes to the right parking lot. In contrast, SAML is a protocol for authentication, or allowing Bob to get past the guardhouse.”

Trust & Safety / Fraud

After Car2Go eased its background checks, 75 of its vehicles were stolen in one day. - Why background check are sometimes necessary.

Trust & Safety / Captcha

You (probably) don't need ReCAPTCHA - Starts with a rant on how the service is a privacy nightmare and is tedious UI-wise, then list alternatives.

Jun 11, 2023

Multi-factor auth / Identifiers

A Comparative Long-Term Study of Fallback Authentication - Key take-away: “schemes based on email and SMS are more usable. Mechanisms based on designated trustees and personal knowledge questions, on the other hand, fall short, both in terms of convenience and efficiency.”

Authorization / AWS policy tools

IAMbic (⭐291) - GitOps for IAM. The Terraform of Cloud IAM. IAMbic is a multi-cloud identity and access management (IAM) control plane that centralizes and simplifies cloud access and permissions. It maintains an eventually consistent, human-readable, bi-directional representation of IAM in version control.

Authorization / Macaroons

Google's Macaroons in Five Minutes or Less - If I'm given a Macaroon that authorizes me to perform some action(s) under certain restrictions, I can non-interactively build a second Macaroon with stricter restrictions that I can then give to you.

OAuth2 & OpenID / Other tools

PKCE Explained - “PKCE is used to provide one more security layer to the authorization code flow in OAuth and OpenID Connect.”

OAuth 2.0 and the Road to Hell - The resignation letter from the lead author and editor of the Oauth 2.0 specification.

Privacy / Profanity

Privacy Enhancing Technologies Decision Tree - A flowchart to select the right tool depending on data type and context.

Privacy / Anonymization

Diffix: High-Utility Database Anonymization - Diffix try to provide anonymization, avoid pseudonymization and preserve data quality. Written in Elixir at Aircloak, it acts as an SQL proxy between the analyst and an unmodified live database.

Apr 22, 2023

Competitive Analysis / GDPR

Best-of Digital Identity (⭐125) - Ranking, popularity and activity status of open-source digital identity projects.

Nov 23, 2022

Cryptography / Identifiers

RFC #4122: UUID - Security Considerations - “Do not assume that UUIDs are hard to guess; they should not be used as security capabilities (identifiers whose mere possession grants access)”. UUIDs are designed to be unique, not to be random or unpredictable: do not use UUIDs as a secret.

Awesome Identifiers - A benchmark of all identifier formats.

Awesome GUID (⭐17) - Funny take on the global aspect of unique identifiers.

Nov 16, 2022

Authorization / ABAC frameworks

Open Policy Agent (⭐10k) - An open-source general-purpose decision engine to create and enforce ABAC policies.

Authorization / ReBAC frameworks

SpiceDB (⭐5.6k) - An open source database system for managing security-critical application permissions inspired by Zanzibar.

Topaz (⭐1.2k) - An open-source project which combines the policy-as-code and decision logging of OPA with a Zanzibar-modeled directory.

Authorization / AWS policy tools

AWS IAM Roles, a tale of unnecessary complexity - The history of fast-growing AWS explains how the current scheme came to be, and how it compares to GCP's resource hierarchy.

Trust & Safety / User Identity

Ballerine (⭐2.2k) - An open-source infrastructure for user identity and risk management.

Nov 01, 2022

Multi-factor auth / Identifiers

SMS Multifactor Authentication in Antarctica - Doesn't work because there are no cellphone towers at stations in Antarctica.

Password-less auth / SMS-based

Magic Links – Are they Actually Outdated? - What are magic links, their origin, pros and cons.

OAuth2 & OpenID / Other tools

Logto (⭐9.9k) - An IAM infrastructure for modern apps and SaaS products, supporting OIDC, OAuth 2.0 and SAML for authentication and authorization.

SAML / Other tools

The SSO Wall of Shame - A documented rant on the excessive pricing practiced by SaaS providers to activate SSO on their product. The author's point is, as a core security feature, SSO should be reasonably priced and not part of an exclusive tier.

Apr 28, 2022

OAuth2 & OpenID / Other tools

a12n-server (⭐477) - A simple authentication system which only implements the relevant parts of the OAuth2 standards.

Apr 27, 2022

OAuth2 & OpenID / Other tools

ZITADEL (⭐10k) - An Open-Source solution built with Go and Angular to manage all your systems, users and service accounts together with their roles and external identities. ZITADEL provides you with OIDC, OAuth 2.0, login & register flows, passwordless and MFA authentication. All this is built on top of eventsourcing in combination with CQRS to provide a great audit trail.

Mar 31, 2022

Authorization / ReBAC frameworks

Open Policy Administration Layer (⭐5.3k) - Open Source administration layer for OPA, detecting changes to both policy and policy data in realtime and pushing live updates to OPA agents. OPAL brings open-policy up to the speed needed by live applications.

Mar 30, 2022

Overview

IAM is hard. It's really hard. - “Overly permissive AWS IAM policies that allowed s3:GetObject to * (all) resources”, led to $80 million fine for Capital One. The only reason why you can't overlook IAM as a business owner.

Multi-factor auth / Identifiers

Your Pa$$word doesn't matter - Same conclusion as above from Microsoft: “Based on our studies, your account is more than 99.9% less likely to be compromised if you use MFA.”

Multi-factor auth / SMS-based

AT&T rep handed control of his cellphone account to a hacker

Password-less auth / JWT

JWT, JWS and JWE for Not So Dummies! - A signed JWT is known as a JWS (JSON Web Signature). In fact a JWT does not exist itself — either it has to be a JWS or a JWE (JSON Web Encryption). Its like an abstract class — the JWS and JWE are the concrete implementations.

Secret Management / Hardware Security Module (HSM)

Everybody be cool, this is a robbery! - A case study of vulnerability and exploitability of a HSM (in French, sorry).

Trust & Safety / Moderation

You either die an MVP or live long enough to build content moderation - “You can think about the solution space for this problem by considering three dimensions: cost, accuracy and speed. And two approaches: human review and machine review. Humans are great in one of these dimensions: accuracy. The downside is that humans are expensive and slow. Machines, or robots, are great at the other two dimensions: cost and speed - they're much cheaper and faster. But the goal is to find a robot solution that is also sufficiently accurate for your needs.”

Blocklists / Hostnames and Subdomains

Subdomain denylists: #1, #2 (⭐44), #3 (⭐166), #4.

Oct 26, 2021

Password-less auth / Public-Key Infrastructure (PKI)

PKI for busy people - Quick overview of the important stuff.

Oct 16, 2021

Multi-factor auth / Identifiers

Kanidm (⭐3.4k) - Simple, secure and fast identity management platform.

Oct 08, 2021

Account Management

SuperTokens (⭐14k) - Open-source project for login and session management which supports passwordless, social login, email and phone logins.

UserFrosting (⭐1.6k) - Modern PHP user login and management framework.

Multi-factor auth / Identifiers

Authelia (⭐24k) - Open-source authentication and authorization server providing two-factor authentication and single sign-on (SSO) for your applications via a web portal.

Password-less auth / JWT

jwtXploiter (⭐272) - A tool to test security of json web token.

Oct 06, 2021

Authorization / ReBAC frameworks

Zanzibar: Google's Consistent, Global Authorization System - Scales to trillions of access control lists and millions of authorization requests per second to support services used by billions of people. It has maintained 95th-percentile latency of less than 10 milliseconds and availability of greater than 99.999% over 3 years of production use. Other bits not in the paper. Zanzibar Academy is a site dedicated to explaining how Zanzibar works.

Sep 27, 2021

Authentication / Identifiers

A Child's Garden of Inter-Service Authentication Schemes - In the same spirit as above, but this time at the service level.

Sep 22, 2021

Authorization / Policy models

Why Authorization is Hard - Because it needs multiple tradeoffs on Enforcement which is required in so many places, on Decision architecture to split business logic from authorization logic, and on Modeling to balance power and complexity.

The never-ending product requirements of user authorization - How a simple authorization model based on roles is not enough and gets complicated fast due to product packaging, data locality, enterprise organizations and compliance.

Sep 07, 2021

Authorization / Policy models

RBAC like it was meant to be - How we got from DAC (unix permissions, secret URL), to MAC (DRM, MFA, 2FA, SELinux), to RBAC. Details how the latter allows for better modeling of policies, ACLs, users and groups.

The Case for Granular Permissions - Discuss the limitations of RBAC and how ABAC (Attribute-Based Access Control) addresses them.

In Search For a Perfect Access Control System - The historical origins of authorization schemes. Hints at the future of sharing, trust and delegation between different teams and organizations.

Authorization / RBAC frameworks

Cerbos (⭐3.8k) - An authorization endpoint to write context-aware access control policies.

Aug 27, 2021

Authentication / Identifiers

API Tokens: A Tedious Survey - An overview and comparison of all token-based authentication schemes for end-user APIs.

Authorization / RBAC frameworks

Oso (⭐3.5k) - A batteries-included library for building authorization in your application.

SAML / Other tools

SAML is insecure by design - Not only weird, SAML is also insecure by design, as it relies on signatures based on XML canonicalization, not XML byte stream. Which means you can exploit XML parser/encoder differences.

Jul 27, 2021

Competitive Analysis / GDPR

DigitalOcean Accounts changelog - All the latest accounts updates on DO.

Jul 19, 2021

Authorization / AWS policy tools

ConsoleMe (⭐3.2k) - A self-service tool for AWS that provides end-users and administrators credentials and console access to the onboarded accounts based on their authorization level of managing permissions across multiple accounts, while encouraging least-privilege permissions.

Jul 03, 2021

Multi-factor auth / Identifiers

2FA is missing a key feature - “When my 2FA code is entered incorrectly I'd like to know about it”.

UX/UI / GDPR

11 Tips for Better Signup / Login UX - Some basic tips on the login form.

Jun 27, 2021

Authorization / RBAC frameworks

Biscuit - Biscuit merge concepts from cookies, JWTs, macaroons and Open Policy Agent. “It provide a logic language based on Datalog to write authorization policies. It can store data, like JWT, or small conditions like Macaroons, but it is also able to represent more complex rules like role-based access control, delegation, hierarchies.”

Jun 21, 2021

OAuth2 & OpenID / Other tools

Casdoor (⭐11k) - A UI-first centralized authentication / Single-Sign-On (SSO) platform based. Supports OIDC and OAuth 2, social logins, user management, 2FA based on Email and SMS.

Jun 04, 2021

Password-less auth / SMS-based

An argument for passwordless - Passwords are not the be-all and end-all of user authentication. This article tries to tell you why.

May 20, 2021

Password-based auth / Identifiers

Password Storage Cheat Sheet - The only way to slow down offline attacks is by carefully choosing hash algorithms that are as resource intensive as possible.

OAuth2 & OpenID / Other tools

OAuth 2.0 Security Best Current Practice - “Updates and extends the OAuth 2.0 Security Threat Model to incorporate practical experiences gathered since OAuth 2.0 was published and covers new threats relevant due to the broader application”.

Hidden OAuth attack vectors - How to identify and exploit some of the key vulnerabilities found in OAuth 2.0 authentication mechanisms.

authentik - Open-source Identity Provider similar to Keycloak.

SAML / Other tools

The Difficulties of SAML Single Logout - On the technical and UX issues of single logout implementations.

Mar 07, 2021

Competitive Analysis / GDPR

Google Cloud Developer's Cheat Sheet (⭐8.1k) - Describe all GCP products in 4 words or less.

Dec 13, 2020

Authorization / AWS policy tools

IAM Floyd (⭐557) - AWS IAM policy statement generator with fluent interface. Helps with creating type safe IAM policies and writing more restrictive/secure statements by offering conditions and ARN generation via IntelliSense. Available for Node.js, Python, .Net and Java.

Dec 07, 2020

Overview

The EnterpriseReady SaaS Feature Guides - The majority of the features making B2B users happy will be implemented by the IAM perimeter.

IAM Is The Real Cloud Lock-In - A little click-baity, but author admit that “It depends on how much you trust them to 1. Stay in business; 2. Not jack up your prices; 3. Not deprecate services out from under you; 4. Provide more value to you in business acceleration than they take away in flexibility.”

Security

Enterprise Information Security - Mozilla's security and access guidelines.

Mitigating Cloud Vulnerabilities - “This document divides cloud vulnerabilities into four classes (misconfiguration, poor access control, shared tenancy vulnerabilities, and supply chain vulnerabilities)”.

Cartography (⭐3.3k) - A Neo4J-based tool to map out dependencies and relationships between services and resources. Supports AWS, GCP, GSuite, Okta and GitHub.

Open guide to AWS Security and IAM (⭐36k)

Account Management

As a user, I want… - A meta-critic of account management, in which features expected by the business clash with real user needs, in the form of user stories written by a fictional project manager.

Things end users care about but programmers don't - In the same spirit as above, but broader: all the little things we overlook as developers but users really care about. In the top of that list lies account-centric features, diverse integration and import/export tools. I.e. all the enterprise customers needs to cover.

Separate the account, user and login/auth details - Sound advice to lay down the foundation of a future-proof IAM API.

Identity Beyond Usernames - On the concept of usernames as identifiers, and the complexities introduced when unicode characters meets uniqueness requirements.

Cryptography

Cryptographic Right Answers - An up to date set of recommendations for developers who are not cryptography engineers. There's even a shorter summary available.

Real World Crypto Symposium - Aims to bring together cryptography researchers with developers, focusing on uses in real-world environments such as the Internet, the cloud, and embedded devices.

An Overview of Cryptography - “This paper has two major purposes. The first is to define some of the terms and concepts behind basic cryptographic methods, and to offer a way to compare the myriad cryptographic schemes in use today. The second is to provide some real examples of cryptography in use today.”

Papers we love: Cryptography (⭐92k) - Foundational papers of cryptography.

Lifetimes of cryptographic hash functions - “If you are using compare-by-hash to generate addresses for data that can be supplied by malicious users, you should have a plan to migrate to a new hash every few years”.

Cryptography / Identifiers

Security Recommendations for Any Device that Depends on Randomly-Generated Numbers - “The phrase ‘random number generator’ should be parsed as follows: It is a random generator of numbers. It is not a generator of random numbers.”

Zero-trust Network / Identifiers

BeyondCorp: A New Approach to Enterprise Security - Quick overview of Google's Zero-trust Network initiative.

What is BeyondCorp? What is Identity-Aware Proxy? - More companies add extra layers of VPNs, firewalls, restrictions and constraints, resulting in a terrible experience and a slight security gain. There's a better way.

oathkeeper (⭐3.3k) - Identity & Access Proxy and Access Control Decision API that authenticates, authorizes, and mutates incoming HTTP requests. Inspired by the BeyondCorp / Zero Trust white paper.

transcend (⭐252) - BeyondCorp-inspired Access Proxy server.

Pomerium (⭐4.2k) - An identity-aware proxy that enables secure access to internal applications.

Authentication / Identifiers

Scaling backend authentication at Facebook - How-to in a nutshell: 1. Small root of trust; 2. TLS isn't enough; 3. Certificate-based tokens; 4. Crypto Auth Tokens (CATs). See the slides for more details.

Password-based auth / Identifiers

The new NIST password guidance - A summary of NIST Special Publication 800-63B covering new password complexity guidelines.

Password expiration is dead - Recent scientific research calls into question the value of many long-standing password-security practices such as password expiration policies, and points instead to better alternatives such as enforcing banned-password lists and MFA.

Banks, Arbitrary Password Restrictions and Why They Don't Matter - “Arbitrary low limits on length and character composition are bad. They look bad, they lead to negative speculation about security posture and they break tools like password managers.”

Dumb Password Rules (⭐3k) - Shaming sites with dumb password rules.

Plain Text Offenders - Public shaming of websites storing passwords in plain text.

Password Manager Resources (⭐4.3k) - A collection of password rules, change URLs and quirks by sites.

A Well-Known URL for Changing Passwords (⭐901) - Specification defining site resource for password updates.

How to change the hashing scheme of already hashed user's passwords - Good news: you're not stuck with a legacy password saving scheme. Here is a trick to transparently upgrade to stronger hashing algorithm.

Multi-factor auth / Identifiers

Breaking Password Dependencies: Challenges in the Final Mile at Microsoft - The primary source of account hacks is password spraying (on legacy auth like SMTP, IMAP, POP, etc.), second is replay attack. Takeaway: password are insecure, use and enforce MFA.

Beyond Passwords: 2FA, U2F and Google Advanced Protection - An excellent walk-trough over all these technologies.

Secrets, Lies, and Account Recovery: Lessons from the Use of Personal Knowledge Questions at Google - “Our analysis confirms that secret questions generally offer a security level that is far lower than user-chosen passwords. (…) Surprisingly, we found that a significant cause of this insecurity is that users often don't answer truthfully. (…) On the usability side, we show that secret answers have surprisingly poor memorability”.

How effective is basic account hygiene at preventing hijacking - Google security team's data shows 2FA blocks 100% of automated bot hacks.

Attacking Google Authenticator - Probably on the verge of paranoia, but might be a reason to rate limit 2FA validation attempts.

Compromising online accounts by cracking voicemail systems - Or why you should not rely on automated phone calls as a method to reach the user and reset passwords, 2FA or for any kind of verification. Not unlike SMS-based 2FA, it is currently insecure and can be compromised by the way of its weakest link: voicemail systems.

Getting 2FA Right in 2019 - On the UX aspects of 2FA.

Multi-factor auth / SMS-based

SMS 2FA auth is deprecated by NIST - NIST has said that 2FA via SMS is bad and awful since 2016.

SMS: The most popular and least secure 2FA method

Is SMS 2FA Secure? No. - Definitive research project demonstrating successful attempts at SIM swapping.

Hackers Hit Twitter C.E.O. Jack Dorsey in a 'SIM Swap.' You're at Risk, Too.

The Most Expensive Lesson Of My Life: Details of SIM port hack

SIM swap horror story

AWS is on its way to deprecate SMS-based 2FA - “We encourage you to use MFA through a U2F security key, hardware device, or virtual (software-based) MFA device. You can continue using this feature until January 31, 2019.”

Password-less auth / WebAuthn

WebAuthn guide - Introduce WebAuthn as a standard supported by all major browsers, and allowing “servers to register and authenticate users using public key cryptography instead of a password”.

Password-less auth / Security key

Webauthn and security keys - Describe how authentication works with security keys, details the protocols, and how they articulates with WebAuthn. Key takeaway: “There is no way to create a U2F key with webauthn however. (…) So complete the transition to webauthn of your login process first, then transition registration.”

Getting started with security keys - A practical guide to stay safe online and prevent phishing with FIDO2, WebAuthn and security keys.

Solo (⭐2.3k) - Open security key supporting FIDO2 & U2F over USB + NFC.

OpenSK (⭐3.1k) - Open-source implementation for security keys written in Rust that supports both FIDO U2F and FIDO2 standards.

YubiKey Guide (⭐12k) - Guide to using YubiKey as a SmartCard for storing GPG encryption, signing and authentication keys, which can also be used for SSH. Many of the principles in this document are applicable to other smart card devices.

YubiKey at Datadog (⭐496) - Guide to setup Yubikey, U2F, GPG, git, SSH, Keybase, VMware Fusion and Docker Content Trust.

Password-less auth / Public-Key Infrastructure (PKI)

Everything you should know about certificates and PKI but are too afraid to ask - PKI lets you define a system cryptographically. It's universal and vendor neutral.

lemur - Acts as a broker between CAs and environments, providing a central portal for developers to issue TLS certificates with 'sane' defaults.

CFSSL (⭐9k) - A swiss army knife for PKI/TLS by CloudFlare. Command line tool and an HTTP API server for signing, verifying, and bundling TLS certificates.

JA3 (⭐2.9k) - Method for creating SSL/TLS client fingerprints that should be easy to produce on any platform and can be easily shared for threat intelligence.

Password-less auth / JWT

Introduction to JSON Web Tokens - Get up to speed on JWT with this article.

Learn how to use JWT for Authentication (⭐4.2k) - Learn how to use JWT to secure your web app.

Using JSON Web Tokens as API Keys - Compared to API keys, JWTs offers granular security, homogeneous auth architecture, decentralized issuance, OAuth2 compliance, debuggability, expiration control, device management.

Managing a Secure JSON Web Token Implementation - JWT has all sorts of flexibility that make it hard to use well.

Hardcoded secrets, unverified tokens, and other common JWT mistakes - A good recap of all JWT pitfalls.

Adding JSON Web Token API Keys to a DenyList - On token invalidation.

Stop using JWT for sessions - And why your "solution" doesn't work, because stateless JWT tokens cannot be invalidated or updated. They will introduce either size issues or security issues depending on where you store them. Stateful JWT tokens are functionally the same as session cookies, but without the battle-tested and well-reviewed implementations or client support.

JOSE is a Bad Standard That Everyone Should Avoid - The standards are either completely broken or complex minefields hard to navigate.

JWT.io - Allows you to decode, verify and generate JWT.

loginsrv - Standalone minimalistic login server providing a JWT login for multiple login backends (htpasswd, OSIAM, user/password, HTTP basic authentication, OAuth2: GitHub, Google, Bitbucket, Facebook, GitLab).

Authorization / Policy models

Semantic-based Automated Reasoning for AWS Access Policies using SMT - Zelkova is how AWS does it. This system perform symbolic analysis of IAM policies, and solve the reachability of resources according user's rights and access constraints. Also see the higher-level introduction given at re:inforce 2019.

Authorization / RBAC frameworks

Athenz (⭐932) - Set of services and libraries supporting service authentication and role-based authorization for provisioning and configuration.

Authorization / ABAC frameworks

Keto (⭐5k) - Policy decision point. It uses a set of access control policies, similar to AWS policies, in order to determine whether a subject is authorized to perform a certain action on a resource.

Ladon (⭐2.4k) - Access control library, inspired by AWS.

Authorization / AWS policy tools

Become an AWS IAM Policy Ninja - “In my nearly 5 years at Amazon, I carve out a little time each day, each week to look through the forums, customer tickets to try to find out where people are having trouble.”

Policy Sentry (⭐2.1k) - Writing security-conscious IAM Policies by hand can be very tedious and inefficient. Policy Sentry helps users to create least-privilege policies in a matter of seconds.

Authorization / Macaroons

Macaroons: Cookies with Contextual Caveats for Decentralized Authorization in the Cloud - Google's original paper.

Google paper's author compares Macaroons and JWTs - As a consumer/verifier of macaroons, they allow you (through third-party caveats) to defer some authorization decisions to someone else. JWTs don't.

OAuth2 & OpenID / Other tools

An Illustrated Guide to OAuth and OpenID Connect - Explain how these standards work using simplified illustrations.

OAuth 2 Simplified - A reference article describing the protocol in simplified format to help developers and service providers implement it.

OAuth 2.0 and OpenID Connect (in plain English) - Starts with an historical context on how these standards came to be, clears up the innacuracies in the vocabulary, then details the protocols and its pitfalls to make it less intimidating.

Everything You Need to Know About OAuth (2.0) - A good overview with a practical case study on how Teleport, an open-source remote access tool, allows users to log in through GitHub SSO.

OAuth in one picture - A nice summary card.

Open-Sourcing BuzzFeed's SSO Experience - OAuth2-friendly adaptation of the Central Authentication Service (CAS) protocol. You'll find there good OAuth user flow diagrams.

Keycloak - Open-source Identity and Access Management. Supports OIDC, OAuth 2 and SAML 2, LDAP and AD directories, password policies.

The Decline of OpenID - OpenID is being replaced in the public web to a mix of OAuth 1, OAuth 2 or other proprietary SSO protocols.

Why Mastercard Doesn't Use OAuth 2.0 - “They did this to provide message-level integrity. OAuth 2 switched to transport-level confidentiality/integrity.” (which TLS provides) (source).

SAML / Other tools

How SAML 2.0 Authentication Works - Overview of the how and why of SSO and SAML.

Web Single Sign-On, the SAML 2.0 perspective - Another naive explanation of SAML workflow in the context of corporate SSO implementation.

The Beer Drinker's Guide to SAML - SAML is arcane at times. A another analogy might helps get more sense out of it.

Secret Management / Other tools

Secret at Scale at Netflix - Solution based on blind signatures. See the slides.

High Availability in Google's Internal KMS - Not GCP's KMS, but the one at the core of their infrastructure. See the slides.

sops - Editor of encrypted files that supports YAML, JSON, ENV, INI and BINARY formats and encrypts with AWS KMS, GCP KMS, Azure Key Vault, age, and PGP.

gitleaks - Audit git repos for secrets.

truffleHog - Searches through git repositories for high entropy strings and secrets, digging deep into commit history.

Keywhiz - A system for managing and distributing secrets, which can fit well with a service oriented architecture (SOA).

roca - Python module to check for weak RSA moduli in various key formats.

Secret Management / Hardware Security Module (HSM)

HSM: What they are and why it's likely that you've (indirectly) used one today - Really basic overview of HSM usages.

Tidbits on AWS Cloud HSM hardware - AWS CloudHSM Classic is backed by SafeNet's Luna HSM, current CloudHSM rely on Cavium's Nitrox, which allows for partitionable "virtual HSMs".

Keystone - Open-source project for building trusted execution environments (TEE) with secure hardware enclaves, based on the RISC-V architecture.

Project Oak (⭐1.4k) - A specification and a reference implementation for the secure transfer, storage and processing of data.

Trust & Safety / Hardware Security Module (HSM)

Trust and safety 101 - A great introduction on the domain and its responsibilities.

What the Heck is Trust and Safety? - A couple of real use-case to demonstrate the role of a TnS team.

Awesome List of Billing and Payments: Fraud links (⭐1.1k) - Section dedicated to fraud management for billing and payment, from our sister repository.

Trust & Safety / User Identity

The Laws of Identity - Is this paper aims at identity metasystem, its laws still provides great insights at smaller scale, especially the first law: to always allow user control and ask for consent to earn trust.

How Uber Got Lost - “To limit "friction" Uber allowed riders to sign up without requiring them to provide identity beyond an email — easily faked — or a phone number. (…) Vehicles were stolen and burned; drivers were assaulted, robbed and occasionally murdered. The company stuck with the low-friction sign-up system, even as violence increased.”

A Comparison of Personal Name Matching: Techniques and Practical Issues - Customer name matching has lots of application, from account deduplication to fraud monitoring.

Statistically Likely Usernames (⭐1.1k) - Wordlists for creating statistically likely usernames for use in username-enumeration, simulated password-attacks and other security testing tasks.

Sherlock (⭐64k) - Hunt down social media accounts by username across social networks.

Trust & Safety / Fraud

Investigation into the Unusual Signups - A really detailed analysis of suspicious contributor signups on OpenStreetMap. This beautiful and high-level report demonstrating an orchestrated and directed campaign might serve as a template for fraud reports.

MIDAS: Detecting Microcluster Anomalies in Edge Streams (⭐776) - A proposed method to “detects microcluster anomalies, or suddenly arriving groups of suspiciously similar edges, in edge streams, using constant time and memory.”

Gephi (⭐6.1k) - Open-source platform for visualizing and manipulating large graphs.

Trust & Safety / Moderation

Still Logged In: What AR and VR Can Learn from MMOs - “If you host an online community, where people can harm another person: you are on the hook. And if you can't afford to be on the hook, don't host an online community”.

Trust & Safety / Threat Intelligence

Awesome Threat Intelligence (⭐8.7k) - “A concise definition of Threat Intelligence: evidence-based knowledge, including context, mechanisms, indicators, implications and actionable advice, about an existing or emerging menace or hazard to assets that can be used to inform decisions regarding the subject's response to that menace or hazard.”

SpiderFoot (⭐14k) - An open source intelligence (OSINT) automation tool. It integrates with just about every data source available and uses a range of methods for data analysis, making that data easy to navigate.

Standards related to Threat Intelligence - Open standards, tools and methodologies to support threat intelligence analysis.

MISP taxonomies and classification - Tags to organize information on “threat intelligence including cyber security indicators, financial fraud or counter-terrorism information.”

Browser Fingerprinting: A survey - Fingerprints can be used as a source of signals to identify bots and fraudsters.

The challenges of file formats - At one point you will let users upload files in your system. Here is a corpus of suspicious media files (⭐1.5k) that can be leveraged by scammers =to bypass security or fool users.

SecLists (⭐62k) - Collection of multiple types of lists used during security assessments, collected in one place. List types include usernames, passwords, URLs, sensitive data patterns, fuzzing payloads, web shells, and many more.

PhishingKitTracker (⭐100) - CSV database of email addresses used by threat actor in phishing kits.

PhoneInfoga (⭐14k) - Tools to scan phone numbers using only free resources. The goal is to first gather standard information such as country, area, carrier and line type on any international phone numbers with a very good accuracy. Then search for footprints on search engines to try to find the VoIP provider or identify the owner.

Confusable Homoglyphs (⭐160) - Homoglyphs is a common phishing trick.

Trust & Safety / Captcha

Awesome Captcha (⭐1.3k) - Reference all open-source captcha libraries, integration, alternatives and cracking tools.

reCaptcha - reCaptcha is still an effective, economical and quick solution when your company can't afford to have a dedicated team to fight bots and spammers at internet scale.

Blocklists / Captcha

Bloom Filter - Perfect for this use-case, as bloom filters are designed to quickly check if an element is not in a (large) set. Variations of bloom filters exist for specific data types.

How Radix trees made blocking IPs 5000 times faster - Radix trees might come handy to speed-up IP blocklists.

Blocklists / Hostnames and Subdomains

hosts - Consolidates reputable hosts files, and merges them into a unified hosts file with duplicates removed.

nextdns/metadata - Extensive collection of list for security, privacy and parental control.

The Public Suffix List - Mozilla's registry of public suffixes, under which Internet users can (or historically could) directly register names.

Country IP Blocks (⭐834) - CIDR country-level IP data, straight from the Regional Internet Registries, updated hourly.

Certificate Transparency Subdomains (⭐346) - An hourly updated list of subdomains gathered from certificate transparency logs.

common-domain-prefix-suffix-list.tsv - Top-5000 most common domain prefix/suffix list.

hosts-blocklists - No more ads, tracking and other virtual garbage.

xkeyscorerules100.txt - NSA's XKeyscore matching rules for TOR and other anonymity preserving tools.

pyisp - IP to ISP lookup library (includes ASN).

AMF site blocklist - Official French denylist of money-related fraud sites.

Blocklists / Emails

Burner email providers (⭐1.1k) - A list of temporary email providers. And its derivative Python module (⭐3.6k).

MailChecker (⭐1.7k) - Cross-language temporary (disposable/throwaway) email detection library.

Temporary Email Address Domains - A list of domains for disposable and temporary email addresses. Useful for filtering your email list to increase open rates (sending email to these domains likely will not be opened).

gman - “A ruby gem to check if the owner of a given email address or website is working for THE MAN (a.k.a verifies government domains).” Good resource to hunt for potential government customers in your user base.

Swot - In the same spirit as above, but this time to flag academic users.

Blocklists / Reserved IDs

General List of Reserved Words - This is a general list of words you may want to consider reserving, in a system where users can pick any name.

Hostnames and usernames to reserve - List of all the names that should be restricted from registration in automated systems.

Blocklists / Profanity

List of Dirty, Naughty, Obscene, and Otherwise Bad Words (⭐3.1k) - Profanity blocklist from Shutterstock.

profanity-check - Uses a linear SVM model trained on 200k human-labeled samples of clean and profane text strings.

Privacy / Profanity

Paper we love: Privacy (⭐92k) - A collection of scientific studies of schemes providing privacy by design.

IRMA Authentication - Open-source app and protocol that offers privacy-friendly attribute based authentication and signing using Camenisch and Lysyanskaya's Idemix.

Have I been Pwned? - Data breach index.

Automated security testing for Software Developers - Most privacy breaches were allowed by known vulnerabilities in third-party dependencies. Here is how to detect them by the way of CI/CD.

Email marketing regulations around the world (⭐453) - As the world becomes increasingly connected, the email marketing regulation landscape becomes more and more complex.

Privacy / Anonymization

The False Allure of Hashing for Anonymization - Hashing is not sufficient for anonymization no. But still it is good enough for pseudonymization (which is allowed by the GDPR).

Four cents to deanonymize: Companies reverse hashed email addresses - “Hashed email addresses can be easily reversed and linked to an individual”.

Why differential privacy is awesome - Explain the intuition behind differential privacy, a theoretical framework which allow sharing of aggregated data without compromising confidentiality. See follow-up articles with more details and practical aspects.

k-anonymity: an introduction - An alternative anonymity privacy model.

Presidio (⭐4.5k) - Context aware, pluggable and customizable data protection and PII data anonymization service for text and images.

Privacy / GDPR

GDPR Developer Guide (⭐335) - Best practices for developers.

GDPR – A Practical guide for Developers - A one-page summary of the above.

GDPR documents (⭐264) - Templates for personal use to have companies comply with "Data Access" requests.

Dark Patterns after the GDPR - This paper demonstrates that, because of the lack of GDPR law enforcements, dark patterns and implied consent are ubiquitous.

GDPR Enforcement Tracker - List of GDPR fines and penalties.

UX/UI / GDPR

The 2020 State of SaaS Product Onboarding - Covers all the important facets of user onboarding.

User Onboarding Teardowns - A huge list of deconstructed first-time user signups.

Discover UI Design Decisions Of Leading Companies - From Leaked Screenshots & A/B Tests.

Conversion Optimization - A collection of tactics to increase the chance of users finishing the account creation funnel.

Trello User Onboarding - A detailed case study, nicely presented, on how to improve user onboarding.

Don't get clever with login forms - Create login forms that are simple, linkable, predictable, and play nicely with password managers.

Why are the username and password on two different pages? - To support both SSO and password-based login. Now if breaking the login funnel in 2 steps is too infuriating to users, solve this as Dropbox does: an AJAX request when you enter your username.

HTML attributes to improve your users' two factor authentication experience - “In this post we will look at the humble <input> element and the HTML attributes that will help speed up our users' two factor authentication experience”.

Remove password masking - Summarizes the results from an academic study investigating the impact removing password masking has on consumer trust.

For anybody who thinks "I could build that in a weekend," this is how Slack decides to send a notification - Notifications are hard. Really hard.

Competitive Analysis / GDPR

AWS Security, Identity & Compliance announcements - The source of all new features added to the IAM perimeter.

GCP IAM release notes - Also of note: Identity, Identity Platform, Resource Manager, Key Management Service/HSM, Access Context Manager, Identity-Aware Proxy, Data Loss Prevention and Security Scanner.

Unofficial Weekly Google Cloud Platform newsletter - Relevant keywords: IAM and Security.

163 AWS services explained in one line each - Help makes sense of their huge service catalog. In the same spirit: AWS in simple terms & AWS In Plain English.

History / GDPR

cryptoanarchy.wiki - Cypherpunks overlaps with security. This wiki compiles information about the movement, its history and the people/events of note.

Nov 11, 2020

Password-based auth / Identifiers

Practical Recommendations for Stronger, More Usable Passwords - This study recommend the association of: blocklist checks against commonly leaked passwords, password policies without character-class requirements, minimum-strength policies.

Authorization / AWS policy tools

PolicyUniverse (⭐437) - Parse and process AWS policies, statements, ARNs, and wildcards.

Privacy / Profanity

World's Biggest Data Breaches & Hacks - Don't be the next company leaking your customer's data.

Nov 06, 2020

Account Management

Kratos (⭐12k) - User login, user registration, 2FA and profile management.

Nov 05, 2020

Account Management

Conjur (⭐816) - Automatically secures secrets used by privileged users and machine identities.

Authorization / ABAC frameworks

Casbin (⭐18k) - Open-source access control library for Golang projects.

Jul 28, 2020

Trust & Safety / Moderation

The despair and darkness of people will get to you - Moderation of huge social networks is performed by an army of outsourced subcontractors. These people are exposed to the worst and generally ends up with PTSD.

The Cleaners - A documentary on these teams of underpaid people removing posts and deleting accounts.

Jul 27, 2020

SAML / Other tools

What's the Difference Between OAuth, OpenID Connect, and SAML? - Identity is hard. Another take on the different protocol is always welcome to help makes sense of it all.

Jul 26, 2020

SAML / Other tools

The Difference Between SAML 2.0 and OAuth 2.0 - “Even though SAML was actually designed to be widely applicable, its contemporary usage is typically shifted towards enterprise SSO scenarios. On the other hand, OAuth was designed for use with applications on the Internet, especially for delegated authorisation.”