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Resources to learn and implement authentication in your application
https://github.com/gitcommitshow/awesome-authentication

List: awesome-authentication

authentication authentication-backend authentication-strategy digital-signature jwt learning oauth2 resources rfc-7519

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Resources to learn and implement authentication in your application

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This is compilation of research on implementing authentication in applications(Covering authentication using JWT for now, more approaches will follow soon)



## Fundamentals You Must Know



### Cryptography



* [Assymetric Cryptography](https://en.wikipedia.org/wiki/Public-key_cryptography)

* [Digital Signatures : Verifying authenticity of message](https://en.wikipedia.org/wiki/Digital_signature)

* [Forward Secrecy :  A way to protect against future compromises of private key](https://en.wikipedia.org/wiki/Forward_secrecy)

* [Encryption vs Signing](https://stackoverflow.com/questions/454048/what-is-the-difference-between-encrypting-and-signing-in-asymmetric-encryption)

* [Encryption vs Encoding](https://stackoverflow.com/questions/4657416/difference-between-encoding-and-encryption)

* [Hashing vs Encoding cs Encryption vs Obfuscation](https://danielmiessler.com/study/encoding-encryption-hashing-obfuscation/)



### About Tokens



* [JWT](https://tools.ietf.org/html/rfc7519)

* [JWT vs Opaque tokens](https://medium.com/hackernoon/all-you-need-to-know-about-user-session-security-ee5245e6bdad)



### About Frameworks



* [**OAuth2.0** - authorization framework to enable third-party application obtain limited access to HTTP service](https://tools.ietf.org/html/rfc6749#section-4.1.3)

* [**OpenIDConnect** - authentication on top of OAuth2.0](https://openid.net/specs/openid-connect-core-1_0.html)



### Web-Security Recommendations



* [Authentication cheatsheet by OWASP](https://cheatsheetseries.owasp.org/cheatsheets/Authentication_Cheat_Sheet.html)

* [PKCE - Proof Key for Code Exchange by OAuth Public Clients](https://tools.ietf.org/html/rfc7636)

* [The OAuth 2.0 Authorization Framework: Bearer Token Usage](https://tools.ietf.org/html/rfc6750)



### Secure Key Exchange In Public



* [Diffie Hellman Key Exchange](https://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange)

* [An SO answer to build more understanding around DH algo, signatures, forward secrecy, etc.](https://security.stackexchange.com/a/73132/229503)

* [Diffie-Hellman key exchange implementation in node.js](https://medium.com/@moghiny/diffie-hellman-key-exchange-theory-and-practice-with-node-js-ab2575e14e8)



### Maintaining Forward Secrecy



* [Double Rachet Algo](https://signal.org/docs/specifications/doubleratchet/)

* [Signal protocol specs](https://signal.org/docs/) & [implemtation lib in js](https://github.com/signalapp/libsignal-protocol-javascript)



### Invalidating JWT



* [Strategies to invalidate jwt - SO Q&A](https://stackoverflow.com/questions/21978658/invalidating-json-web-tokens)



> * Simply remove the token from the client

> * Create a token blacklist

> * Just keep token expiry times short and rotate them often

> * Contingency Plans : allow the user to change an underlying user lookup ID with their login credentials



> A common approach for invalidating tokens when a user changes their password is to sign the token with a hash of their password. Thus if the password changes, any previous tokens automatically fail to verify. You can extend this to logout by including a last-logout-time in the user's record and using a combination of the last-logout-time and password hash to sign the token. This requires a DB lookup each time you need to verify the token signature, but presumably you're looking up the user anyway.



* [Discussion: Is refreshing an expired JWT token a good strategy?](https://security.stackexchange.com/questions/119371/is-refreshing-an-expired-jwt-token-a-good-strategy)



## Securtity Risks and Criticism of JWT



* [JWT attack - signature as MAC](https://snikt.net/blog/2019/05/16/jwt-signature-vs-mac-attacks/)

* [Recreating JWT validation bypass](https://insomniasec.com/cdn-assets/Insomnia_Security_-_JWT_Validation_Bypass_in_Auth0_Authentication_API.pdf)

* [3 JWT design flaws](https://rodarmer.squarespace.com/security-blog/2019/7/21/jwt-security-vulnerabilities)

- [Stop using JWT for sessions](http://cryto.net/~joepie91/blog/2016/06/13/stop-using-jwt-for-sessions/) and [part 2: Why your solution doesn't work](http://cryto.net/%7Ejoepie91/blog/2016/06/19/stop-using-jwt-for-sessions-part-2-why-your-solution-doesnt-work/)

- [Why JWTs Suck as Session Tokens](https://developer.okta.com/blog/2017/08/17/why-jwts-suck-as-session-tokens)

- [No Way, JOSE! Javascript Object Signing and Encryption is a Bad Standard That Everyone Should Avoid](https://paragonie.com/blog/2017/03/jwt-json-web-tokens-is-bad-standard-that-everyone-should-avoid) (including JWT, JWE and JWS)

- https://github.com/shieldfy/API-Security-Checklist/issues/6 with more resources

- [Things to Use Instead of JWT](https://kevin.burke.dev/kevin/things-to-use-instead-of-jwt/)

- [Branca as an Alternative to JWT?](https://appelsiini.net/2017/branca-alternative-to-jwt/)

- [Paseto is a Secure Alternative to the JOSE Standards (JWT, etc.)](https://paragonie.com/blog/2018/03/paseto-platform-agnostic-security-tokens-is-secure-alternative-jose-standards-jwt-etc)



## Implementations(Examples/Demos)



* [Demo: How Docusign APIs auth workflow using JWT access token and refresh tokens](https://developers.docusign.com/esign-rest-api/guides/authentication/oauth2-jsonwebtoken)

* [JWT Authentication & Authorization in NodeJs/Express & MongoDB REST APIs(2019)](https://medium.com/swlh/jwt-authentication-authorization-in-nodejs-express-mongodb-rest-apis-2019-ad14ec818122)

* [JWT+Passport](https://medium.com/front-end-weekly/learn-using-jwt-with-passport-authentication-9761539c4314)

* [JWT+Passport : Code](https://gist.github.com/ArVan/a8eb2bff9e453a1850d17dd3af1d0bea#file-app-js)

* [JWT+Passport : Guide on DO](https://www.digitalocean.com/community/tutorials/api-authentication-with-json-web-tokensjwt-and-passport)

* [Passport-jwt](https://github.com/mikenicholson/passport-jwt)

* [Refreshing token using node-jsonwebtoken](https://gist.github.com/ziluvatar/a3feb505c4c0ec37059054537b38fc48)

* [oAuth2 server with node.js](https://blog.cloudboost.io/how-to-make-an-oauth-2-server-with-node-js-a6db02dc2ce7)

* [oAuth libraries for node.js](https://oauth.net/code/nodejs/)

* **[Inspiration: Read Firefox Accounts Code- All services including autyh-server, profile-server](https://github.com/mozilla/fxa) [Documentation](https://mozilla.github.io/application-services/docs/accounts/welcome.html)**

* **[oAuth2 server toolkit for node.js](https://github.com/jaredhanson/oauth2orize)**

* [OAuth2 Server and OpenID Connect Provider written in Go - sdk in all languages](https://github.com/ory/hydra)

* **[JavaScript client SDK to communicate with OAuth 2.0 and OpenID Connect providers](https://github.com/openid/AppAuth-JS)**

* [AuthZ lib supports ACL, RBAC, ABAC in Node.js](https://github.com/casbin/node-casbin)

* [Google OpenIDConnect authentication](https://developers.google.com/identity/protocols/oauth2/openid-connect)



## Useful Tools



* [Encode or Decode JWTs](https://www.jsonwebtoken.io/)

* [Learn JWT by reverse engineering](https://github.com/gitcommitshow/auth-jwt)