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#Two-Square Cipher

2 articles with this tag.

A visual representation of the two-square cipher breaker recovering two key squares from a crib
Basic Classic Symmetric Breakers Advanced

Breaking the Two-Square Cipher with a Crib

The two-square cipher resists the ciphertext-only search that breaks Playfair and four-square, because it has no fixed reference squares. But a crib of known plaintext breaks it in seconds. Learn the known-plaintext attack, with runnable Python.

13 min read

A visual representation of the Two-Square Cipher
Basic Classic Symmetric Intermediate

The Two-Square Cipher

Learn about the two-square cipher, a digraph substitution cipher that sits between Playfair's single grid and four-square's four grids: two independently keyed squares, one uniform encryption rule.

13 min read

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