Quagmire Crib Analyzer

Recover the keyword and decode Vigenère, Beaufort, and Quagmire I–IV ciphers from a known crib. Paste the ciphertext, type the plaintext you know, and the key stream, period, and decoded text update live.

Inputs

Cipher Type

Cipher Alphabet Keyword (optional — placed at front of alphabet, remainder follows in order)

Cipher Text

Known Plaintext (crib — spaces & punctuation ignored; = skips one letter)

Tip: use = in the crib to skip a letter whose plaintext is unknown — it advances one cipher position without filling the key.

Analysis

Enter ciphertext and a crib to begin.