Encryption Protocol using some Pieces of Message as Key

Abstract

This paper presents a simple message encryption protocol. Mono alphabetic substitution was used in encryption while key was gotten from the original plain text by choosing particular characters which located in different assigned positions. The cipher text were composed of unchanged key part and encrypted part. In decryption, receiver has to pick up a key from received cipher text then performs message decryption by this key. This protocol was evaluated by three proficient in security field and point that this protocol could provide enough confidence in message sending and ease of
use.