Question

Name the final permutation kind in a fiestel network. Write the output block size in bytes for a Data Encryption Standard algorithm.

Answer 1

a Feistel cipher is a symmetric structure used in the construction of block ciphers, named after the German-born physicist and cryptographer Horst Feistelwho did pioneering research while working for IBM (USA); it is also commonly known as aFeistel network.

The DES (Data Encryption Standard) algorithm is the most widely used encryption algorithm in the world. For many years, and among many people, "secret code making" and DES have been synonymous. And despite the recent coup by the Electronic Frontier Foundation in creating a $220,000 machine to crack DES-encrypted messages, DES will live on in government and banking for years to come through a life- extending version called "triple-DES."