Type-3 feistel network of the 128-bits block size improved blowfish cryptographic encyption

Abstract EN

In this paper, a new secret-key block cipher called 128-bits Blowfish is proposed which is an evolutionary improvement of 64-bits Blowfish designed to meet the requirements of the Advanced Encryption Standard (AES) to increase security and to improve performance.

The proposed algorithm will be used a variable key size up to 192 bytes.

It is a Type-3 Feistel network iterated simple function 16 times.

Specifically, in this proposed algorithm, a combination of four S-boxes lookups, multiplications as well as fixed and data-dependent rotations will be used.

Mixing round provide different levels of security, efficiency, flexibility and good avalanche effect.

The proposal is word-oriented, in that all the internal operations are performed on 32-bit words.

So it is possible to implement the algorithm on smart cards efficiently.