Cryptography

• http://en.wikipedia.org/wiki/Glossary_of_cryptographic_keys
• https://en.wikipedia.org/wiki/Outline_of_cryptography
• http://eprint.iacr.org/
• https://tinycrypt.wordpress.com/
• https://littlemaninmyhead.wordpress.com/2015/09/28/so-you-want-to-learn-to-break-ciphers/
• http://outsourcedbits.org/2014/11/11/how-not-to-learn-cryptography/
• http://www.cs.bris.ac.uk/Research/CryptographySecurity/knowledge.html

Free Books

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• A Graduate Course in Applied Cryptography by Dan Boneh and Victor Shoup
• Handbook of Applied Cryptography by Alfred J. Menezes, Paul C. van Oorschot and Scott A. Vanstone
• Cryptography, An Introduction: Third Edition by N.P. Smart
• https://toc.cryptobook.us/
• https://www.crypto101.io/
• https://inventwithpython.com/hacking/chapters/

GPG

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• https://evil32.com/

Password

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• OWASP Password Storage Cheat Sheet
• OWASP Forgot Password Cheat Sheet
• Password Hashing Competition
• Secure Remote Password
• https://crackstation.net/hashing-security.htm
• https://nakedsecurity.sophos.com/2013/11/20/serious-security-how-to-store-your-users-passwords-safely/
• https://paragonie.com/blog/2016/02/how-safely-store-password-in-2016
• http://blog.ircmaxell.com/2012/12/seven-ways-to-screw-up-bcrypt.html
• http://blog.ircmaxell.com/2014/03/why-i-dont-recommend-scrypt.html
• http://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.html
• BLAKE2
• Argon2

Challenges

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• https://cryptopals.com/
• https://projecteuler.net/
• https://id0-rsa.pub/
• https://www.root-me.org/en/Challenges/Cryptanalysis/
• http://www.cryptogram.org/resource-area/solve-a-cipher/

Write-ups

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• https://fail0verflow.com/blog/2014/plaidctf2014-for450-rsa/