Mono-alphabetic Cipher

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Mono-alphabetic Cipher

Post  Shokatsuryou on Mon Sep 12, 2011 5:24 pm

Basically, each letter is substituted with one or more symbols/letters, but each symbol/letter in the encrypted text can only be decoded as one letter.
Example:
Plain-text: flee at once. we are discovered!
Cipher-text: SIAA ZQ LKBA. VA ZOA RFPBLUAOAR!

Examples of mono-alphabetic ciphers include the Caesar Shift and the Pigpen Cipher.

The most commonly used way to crack mono-alph. ciphers is by using frequency analysis.
Freq. Analysis Charts:



Also note that some letters follow other letters more often. For example, q (from my knowledge) is almost always followed by a u.
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