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Cipher Identifier

Cipher identifier and solvers.

Boxentriq's identifier analyses a pasted ciphertext (letter frequency, index of coincidence, patterns) and suggests which classical ciphers it might be. It sits next to solvers for ciphers like Vigenere, Playfair and substitution, which makes it a fast first move on unknown CTF text.

Why it's useful

Narrow down which cipher you face when a ciphertext looks unfamiliar.