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Show that if all the S-boxes in the DES cipher are replaced by an identify function (i.e. given a six-bit input the function outputs the four least significant bits) then the resulting cipher is easily broken. In other words, show that given a few plaintext/ciphertext pairs an attacker can quickly recover the secret key.

Show that if all the S-boxes in the DES cipher are replaced by an identify function (i.e. given a six-bit input the function outputs the four least significant bits) then the resulting cipher is easily broken. In other words, show that given a few plaintext/ciphertext pairs an attacker can quickly recover the secret key.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Show that if all the S-boxes in the DES cipher are replaced by an identify function (i.e.
given a six-bit input the function outputs the four least significant bits) then the resulting
cipher is easily broken. In other words, show that given a few plaintext/ciphertext pairs
an attacker can quickly recover the secret key.

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