A new substitution-permutation network cipher using Walsh Hadamard Transform

As we all know Cryptography is one of the oldest technique analogous to Mathematics. Modern cryptography progressed some systematic methods for providing confidentiality, Integrity, Availability and Authenticity. The contrast in between symmetric key cryptosystem is Block cipher and Stream cipher. Block Cipher is important primordial in modern cryptography and network security. In this paper, we investigate the structure of Substitution and Permutation Network (SPN) Cipher and constructing it using Walsh - Hadamard Transform (WHT). S-Boxes are the key component of SPN cipher. WHT is characteristics two case of DFT and it is mainly used for computation of Non-linearity. Most of the Cryptographic properties are connected with Walsh transformation.