Yes, You Too Can Break Crypto - Exploiting Common Crypto Mistakes

This course explains common cryptographic mistakes and demonstrates weaknesses in XOR, randomness, one-time pads, stream ciphers, and block cipher modes. It also covers padding, integrity, bit-flipping attacks, authenticated encryption, hashing, and key derivation.

Syllabus

Intro
Why this talk • Cryptography: HARD
whoami • Past: software development
General recommendations
Common mistakes
Exclusive OR (XOR)
Randomness
One time pad (OTP)
One time? But why?
Stream cipher (more practical OTP)
Block cipher primitive
Electronic code block (ECB)
Cipher block chaining (CBC)
CBC decryption
Padding (for block ciphers)
What about integrity?
Bit flipping (stream cipher)
Bit flipping (block cipher, CBC mode)
Authenticated encryption
Hash vs KDF
Takeaways
Further learning