Question

1. As you know, DES is insecure because of its short key length (56 bits). An improvement is DESX. DESX has key length 120 bits, seen as a pair K (k₁, k₂), where k₁ is 56 bits and k is 64 bits. The ciphertext c of a one-block message m is c=k2DES(k₁, (mkz))

Name: 1 as you know des is insecure because of its short key length 56 bits an improvement is desx desx has key length 120 bits seen as a pair k k1 k2 where k1 is 56 bits and k is 64 bits the ciph 22917
Uploaded: 2022-10-11T09:22:21-08:00
Duration: 4 min 4 s
Channel: Sri K
Description: 1 as you know des is insecure because of its short key length 56 bits an improvement is desx desx has key length 120 bits seen as a pair k k1 k2 where k1 is 56 bits and k is 64 bits the ciph 22917

          1. As you know, DES is insecure because of its short key length (56 bits). An improvement is DESX. DESX has key length 120 bits, seen as a pair K (k₁, k₂), where k₁ is 56 bits and k is 64 bits. The ciphertext c of a one-block message m is
c=k2DES(k₁, (mkz))

Added by Jose P.

Computer Science and Information Technology

Trishna Knowledge Systems 2018 Edition

Instant Answer

Solved by Expert Sri K

10/11/2022

Step 1

DESX uses a key length of 120 bits, which is divided into two parts: k₁ (56 bits) and k₂ (64 bits). The k₁ part is used as the key for the DES encryption, while k₂ is an additional key used for preprocessing the message. Show more…

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1. As you know, DES is insecure because of its short key length (56 bits). An improvement is DESX. DESX has key length 120 bits, seen as a pair K (k₁, k₂), where k₁ is 56 bits and k is 64 bits. The ciphertext c of a one-block message m is c=k2DES(k₁, (mkz))