encode
decode
Cipher variant
Vigenère
Beaufort
Variant Beaufort
Autokey
Gronsfeld
Keyword
Text to encode
Hello World
Encoded
Rijvs Uyvjn
Decode this
Copy
Copy link to this
Send as a secret message
Try an example
Attack at dawn · LEMON
Crack a mystery message
A Beaufort message
Autokey · QUEEN
Gronsfeld · 31415
A geocache-style puzzle
Crack it: I don’t know the key
Finds the key length and the keyword from the text alone (Vigenère, Beaufort, variant Beaufort, autokey, Gronsfeld)
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Step by step
Every letter worked out, with the Vigenère square
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Letter frequencies
Count the letters and compare them with English
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Which cipher is this?
A guess from the text’s letters and symbols
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