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Hill Cipher

Huge collection of cipher solvers and decoders.

dCode's Hill cipher page encrypts, decrypts and cryptanalyses Hill ciphers, which use matrix multiplication modulo 26. It handles known-plaintext attacks and key matrix recovery, useful for the occasional CTF crypto puzzle. Same site as the main dCode entry.

Why it's useful

When a puzzle uses an obscure cipher, dCode probably has a tool.