Transcription of Lecture 3: Block Ciphers and the Data Encryption Standard ...
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Lecture 3: Block Ciphers and the Data Encryption Standard ...
Lecture 3: Block Ciphers and the data EncryptionStandardLecture Notes on Computer and Network Security by Avi Kak 26, 20213:43pm 2021 Avinash Kak, Purdue UniversityGoals: To introduce the notion of a Block cipher in the modern context. To talk about the infeasibility ofideal Block Ciphers To introduce the notion of theFeistel Cipher Structure To go overDES, the data Encryption Standard To illustrate important DES steps with Python and Perl codeCONTENTSS ection Block of the Encryption Key for the Ideal Block Feistel Structure for Block Description of Each Round in the10 Feistel in Ciphers Based on the Feistel : The data Encryption Round of Processing in S-Box for the Substitution Step in Each Substitution P-Box Permutation in the Feistel DES Key Schedule.
The mapping from the input bit blocks to the output bit blocks ... The DES (Data Encryption Standard) algorithm for encryption and decryption, which is the main theme of this lecture, is based on what is known as the Feistel Structure. This section and the next
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