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Substitution Cipher encoder and decoder 1.0

  Date Added: July 08, 2013  |  Visits: 191

Substitution Cipher encoder and decoder

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This function uses frequency analysis to attack and decode messagesencoded using a /substitution cipher/ which exchanges each letter of thealphabet for another. Unlike the famous "Caesar Shift" cipher, which"shifts" the letters of the alphabet along by a certain amount, givingjust 26 possible ciphers, this has no specific order, giving 26!possibilities. The function is very unlikely to work first time but,depending of the length of the text, highly likely to get the letters "T"and "E" correct. From here the user may spot an error in the decoding,such as "TQE" which is obviously "THE", and the function offers them thechance to swap the offending letters as often as is required. After a fewsimple cases, the encrypted message is generally broken.It removes all punctuation and case from the originaltext. The other m-file can be used to encode messages in the substitution cipher, using a random arrangement of letters and giving the user the cipher key as well as encoded message.

Requirements: No special requirements
Platforms: Matlab
Keyword: Chance Decoding Error Highly Offending Offers Quotthequot Quottqequot
Users rating: 0/10

License: Shareware Size: 10 KB
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