What do you mean by the term G-DES or DESX

Question

What do you mean by the term G-DES or DESX? Briefly define the meaning of it.

Answer 1

G-DES was devised through Schaumuller-Bichl to enhance on the performance of DES through stating a cipher based on the DES with a big block size, however without a raise in the amount of computation needed. This was claimed that G-DES was as secure as DES as the cipher was mainly based on DES. Though, Biham and Shamir exhibited that G-DES with suggested parameter sizes is simply broken and that any alterations of the G-DES parameters which result in a cipher faster than the DES are less secure than DES.