Chapter 8 of 10 · Cryptography 80%

🔓 A short RSA modulus showed up in factordb and broke in under a second. Could you rebuild the private key and read the message yourself?

RSA almost never falls to brute force. It falls to bad keys: close primes, a tiny exponent, reused randomness. You will factor with factordb and Fermat, recover d, decrypt by hand, and run RsaCtfTool across the whole attack set. 🧩

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Cryptography

🔓 A short RSA modulus showed up in factordb and broke in under a second. Could you rebuild the private key and read the message yourself?

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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