This is a tool for breaking the encryption of messages that have been XOR encrypted using a repeated key. This method uses statistics (letter frequencies and use of common words, bigrams, and trigrams), so the cipher-text needs to be a decent size otherwise it won’t work. For an in-depth explanation of how this works, please read my post here.
Minimum Key Length (in Bytes)
Maximum Key Length (in Bytes)
(See console for progress & additional results)