The number of tests required to break the DES algorithm are
(a) 2.8×10^14
(b) 4.2×10^9
(c) 1.84×10^19
(d) 7.2×10^16
I got this question by my school teacher while I was bunking the class.
Question is from The Data Encryption Standard (DES) and It’s Strength topic in portion Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security