Chapter 6 of 10 · Cryptography 60%

🐧 'It's AES-256, it's safe.' Then the encrypted file shows the same block repeating and the penguin's outline appears. Can you spot the broken mode?

AES the algorithm can be unbreakable while the mode leaks everything. In 2013 around 150 million Adobe passwords fell to ECB plus plaintext hints. Learn to spot repeating blocks, bit-flip CBC, and pick the mode that holds. 🔑

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Cryptography

🐧 'It's AES-256, it's safe.' Then the encrypted file shows the same block repeating and the penguin's outline appears. Can you spot the broken mode?

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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