Encryption with Vigenere uses a key made of letters (and an alphabet). There are several ways to achieve the ciphering manually: Vigenere Ciphering by adding letters. In order to cipher a text, take the first letter of the message and the first letter of the key, add their value (letters have a value depending on their rank in the alphabet, starting with 0). Cipher Tools Let's say that you need to send your friend a message, but you don't want another person to know what it is. You can use a full-blown encryption tool, such as PGP. If the message isn't that important or if it is intended. Where ROT13 was based on you adding 13 to the letters, a Caesar cipher lets you add an arbitrary value. Again, you can do it with the cryptogram solver, but you can scroll through values of N pretty easily with this tool. Keyed Caesar: Similar to a Caesar cipher, but you first alter the encoded alphabet with a word or phrase. Columnar Transposition.
- Key in a word or a short phrase in the top box
- Enter a Keyword
- Press Encipher or Decipher
- The results appear in the bottom box
The Keyword Cipher uses a Keyword to rearrange the letters in the alphabet. These different letters are then substituted for the letters in the message to create a secret message. That Keyword is needed to decipher the secret message. The Secret Code Breaker “Handbooks” have computer programs that can be used to determine Keywords and decipher secret messages.
Decipher this secret message – Use SECRET as the Keyword
QDFP FP S HTYWLOR CFMDTO PTCOTQ JTPPSBT
Cipher Decryption Tool Online
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Substitution Cipher Solver Tool
Cipher Solver Tool
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(This JavaScript program written by Jim Hannon for Secret Code Breaker)
Downloadable Keyword Cipher Software
A program written by Peter Conrad that can break many secret messages that have been enciphered using a Keyword Cipher. It is a different program than the Keyword Cipher program that comes on the diskette included with “Secret Code Breaker – A Cryptanalyst’s Handbook”
Substitution Cipher Solver Tool
The download is a Zip file. Requires IBM compatible computer, running DOS or Windows.
Currently no Macintosh version is available (will run using RealPC).