Block Ciphers: AES
Explains the SPN structure used by AES, the roles of confusion and diffusion, and how it differs from the Feistel structure in DES.
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#Cryptography
Posts in this collection, ordered newest first.
Cryptography: Attacks on Classical Ciphers
Explains brute-force key search and frequency analysis, including why monoalphabetic substitution ciphers are vulnerable.