Dihedral Cryptographic Technique

Abstract

This paper focuses on a new technique of cryptography in abstract algebra. We first give the necessary review on Dihedral group and cryptography .We definition a new alphabetic of characters by additive character “blank” ,thus we have (27) characters {26 letters and “blank” },therefore we use modular 27 instead 26 such that we use the reflection and rotation which exists in Dihedral group to change the arrange of vectors of characters in plain text.