The Implementation of Vigenere Cipher on PIC16F84 « The Hardware Side of Cryptography

26 March 2008

The Implementation of Vigenere Cipher on PIC16F84

Filed under: encryption — Tags: Classsic Cipher, PIC16F84, Polyalphabet Substitution, Vigenere — edipermadi @ 10:09 pm

Today, i was reading the “CRYPTOLOGIA History” book. I found nice classical cipher named “vigenere”. This cipher was invented by Blaise de Vigenère. Although this cipher is insecure, lets just code it for the sake of curiosity.

This post is dedicated to provide an example to anyone who is looking for the implementation of Vigenère cipher in hardware, especially on PIC16F84 the PICmicro Microcontroller from microchip. Hopefully this piece will benefit to anyone, at least to satisfy myself .

This cipher mechanism is based on substitution table. The substitution table consisted of columns and rows labelled “A” to “Z”. To get cipher test, first you select the column of plain text and then you select the row of key. The intersection of row of column is called cipher text then. To decode cipher text, you select the row of key and you find the intersection which is equal to cipher text, the label of column is called plain text then. Simple right .