Improved DES Algorithm Based on Variable Time Data Permutation
Karim Moussa Ali Abd Elatif, El-Sayed Hasaneen, Hesham Fathi Ali Hamed · ASME Press eBooks · 2009
This paper presents a new Data Encryption Standard (DES) based on variable time data permutation. Data is periodically permutated by using a permutation box. The permutation box contains several data permutations. The permutation choice will be due to a timer value which controls the permutation choice. for the same data and key, the ciphered data is varied periodically by using the variable time permutation. The results show that the proposed scheme gives a more secure algorithm without additional delay. Also, increasing the size of permutation box increases the security of the proposed scheme.