Use Caesar Cipher for your secret messages

Thursday, May 21, 2009

In encrypting a text message, a substitution technique can be used where the letters of the plain text are replaced by other letters or by numbers or even symbols. The Caesar cipher is a method of encryption that was proposed by Caesar. The method involves replacing each alphabet in a message by the alphabet three places down the line.
Plain: a b c d
Cipher: D E F G
For example, the encrypted form of the message “send the money” will be VHQG WKH PRQHB. All that is required to break the Caesar cipher is to reverse the encipherment process, i.e., replace each alphabet in a cipher text message produced by Caesar cipher with the alphabet that is three places up the line. Thus, take a cipher text produced by Caesar cipher and replace each A with X, B with Y, C with Z and D with A, and so on.