Chapter 9 of 10 · Cryptography 90%

🎲 The PS3 signing key wasn't stolen or factored. It was read straight out of the signatures, because the console reused one random number. Want to see how?

Two strangers can agree on a secret key in full public view, and a strong algorithm still falls if the random numbers under it are predictable. You'll run Diffie-Hellman by hand, break a small one, and make Python's random module repeat itself. 🔑

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Cryptography

🎲 The PS3 signing key wasn't stolen or factored. It was read straight out of the signatures, because the console reused one random number. Want to see how?

Premium Chapter

Ready to track your progress?

Course Progress

Course Chapters

Encoding and encryption

Substitution ciphers

The Vigenere cipher

XOR cryptanalysis

Hash functions and collisions

Block cipher modes

RSA fundamentals

RSA attacks

Key exchange and randomness

Cryptography in the wild