This page allows you to encode text or decode text encrypted with Vernam's cypher. The strength of this cypher depends on knowing an independant secret, such as a secret word, or a page from a book. If the length of the 'secret' is as long as the length of the message itself, then the code that is produced cannot be cracked by statistical methods. If the 'secret' consists of only a single letter, then the cypher becomes a variant of Rot13, which can easily be cracked - it is often used in Puzzle Books for exactly that reason.
Click on any of the links at the top of the page to reveal (or hide) more information about this calculator.
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