Basic String Cryptography

A couple of simple cryptography techniques.

Description

These are three *very* simple codes for implementing the most rudimentary encryption method possible.

CRYPTOSHIFT.m implements a monoalphabetic shifting substitution encryption. It takes two arguements: the string to be encoded and the amount to shift each letter. To decode, shift backward the same amount you shifted forward.

CRYPTOSUBCODE.m generates, from an input string, a coded string and a key. The key represents the random substitutions made, and is used by CRYPTOSUBDECODE.m along with the encoded string to decode a string.

• MATLAB release: MATLAB 6.1 (R12.1)

[l r]

 

[kha swqdw]

 

[kha df]

thank you

[H R]

simple

[alper aydýn]

 

[reza Azadi]

 

[sathish sathi]

 

[Mr Smart]