Tagged Questions
1
vote
1answer
456 views
How can 3DES encryption use decryption in the middle step?
I have been reading about the 3DES algorithm and I cannot understand one part. In 3DES we do following operation: $$C=E[K_3,D[K_2,E[K_1,P]]].$$
Where $C$ is ciphertext, $P$ is plaintext, $E$ is DES ...
4
votes
1answer
130 views
Does anyone have a KAT for 3DES KO-2?
Does any one have, or can refer to a Known-Answer-Test (KAT) for Triple DES Keying Option 2?
(Keying Option 2 means $C = DES_{k_1}(DES^{-1}_{k_2}(DES_{k_1}(P)))$ for encryption and $P = ...
