Chapter 7 of 10 · Cryptography 70%

🔑 An RSA public key is a number anyone can read. Split it back into two primes and you rebuild the private key. RSA-250 fell in 2020. Could you build the machine you are about to break?

RSA is not magic: pick two primes, multiply, publish the product. Its only secret is that nobody can un-multiply a big number. Build a working keypair in six lines of Python and read a real key with openssl, before you attack one. 🧮

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Cryptography

🔑 An RSA public key is a number anyone can read. Split it back into two primes and you rebuild the private key. RSA-250 fell in 2020. Could you build the machine you are about to break?

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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