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#Simulated Annealing

Found 2 articles with this tag.

A visual representation of breaking the Playfair Cipher
Basic Classic Symmetric Breakers Advanced

Breaking the Playfair Cipher

Playfair defeated single-letter frequency analysis by encrypting pairs of letters through a 5×5 key square. But the same simulated-annealing idea that cracks the substitution cipher still works here too, once you swap in quadgram statistics and a richer set of moves.

A visual representation of breaking the monoalphabetic Substitution Cipher
Basic Classic Symmetric Breakers Advanced

Breaking the Substitution Cipher

A monoalphabetic substitution key is one arbitrary permutation of 26 letters: 26! of them, far too many to brute force and immune to Kasiski or the Index of Coincidence since there's no repeating key. Here's how frequency analysis and a hill-climbing search crack it anyway.