2 votes 2 votes How many distinct stages are there in $DES$ algorithm, which is parameterized by a $56$-bit key ? $16$ $17$ $18$ $19$ Computer Networks ugcnetcse-dec2014-paper2 computer-networks cryptography + – makhdoom ghaya asked Jul 21, 2016 recategorized Nov 12, 2017 by Sanjay Sharma makhdoom ghaya 4.5k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
3 votes 3 votes DES(Data Encryption Standard) algorithm which is parameterized by a 56 bit key has 19 distinct stages including 16 rounds or repetition so ans is D Sanjay Sharma answered Jul 21, 2016 Sanjay Sharma comment Share Follow See all 2 Comments See all 2 2 Comments reply anchitjindal07 commented Aug 7, 2018 reply Follow Share Please explain how to solve this 0 votes 0 votes AadilRashid commented Dec 10, 2018 reply Follow Share The answer should be A.16 since, first, one before last and the last are just transpositions of bits and independent of keys. 0 votes 0 votes Please log in or register to add a comment.
1 votes 1 votes 19 stages sh!va answered Jul 21, 2016 sh!va comment Share Follow See 1 comment See all 1 1 comment reply coolsid1983 commented Jul 9, 2018 reply Follow Share Why 19 stages? I know about 16 of them only 0 votes 0 votes Please log in or register to add a comment.
0 votes 0 votes In DES, plain text (here, password) is encrypted in block of 64 bits, yielding 64 bits of cipher text. The algorithm which is parameterized by 56 bit key has 19 distinct stages. Adnan Ashraf answered May 11, 2019 Adnan Ashraf comment Share Follow See all 0 reply Please log in or register to add a comment.