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• Plaintext: 01110010 Simplified-DES • Key: 1010000010 • Ciphertext: 01110111 10-bit key 10 P10 Simplified-DES LS-1 LS-1 P10 (permutate) Input : 123456789 10 Output: 35274 10 1986 P8 K, + P8 (select and permutate) Input :1 23456789 10 Output: 637485 109 LS-2 || LS-2 LS-1 (left shift 1 position) LS-2 (left shift 2 positions) P8 K 8-t plaitest • S-DES (and DES) perform substitutions using S-Boxes • S-Box considered as a matrix: input Simplified-DES IP (initial permutation) Input :12345678 Output:2 63 14857 used to select row/column; selected element is output 4 bit input: bit1, bit2, bit3, bit4 bit1, bit4 specifies row (0,1,2 or 3 in sw decimal) bit2, bit3 specifies column 2-bit output EP(expand and permutate) Input :1 2 34 Output:4 123 2 3 41 01 00 11 10 P4 (permutate) Input :123 4 Output:2 431 00 01 10 11 10 00 01 11 11 00 01 00 10 01 00 11 11 10 01 00 S0 = S1 = 00 10 01 11 11 01 11 10 IP-(inverse of IP)

• Plaintext: 01110010 Simplified-DES • Key: 1010000010 • Ciphertext: 01110111 10-bit key 10 P10 Simplified-DES LS-1 LS-1 P10 (permutate) Input : 123456789 10 Output: 35274 10 1986 P8 K, + P8 (select and permutate) Input :1 23456789 10 Output: 637485 109 LS-2 || LS-2 LS-1 (left shift 1 position) LS-2 (left shift 2 positions) P8 K 8-t plaitest • S-DES (and DES) perform substitutions using S-Boxes • S-Box considered as a matrix: input Simplified-DES IP (initial permutation) Input :12345678 Output:2 63 14857 used to select row/column; selected element is output 4 bit input: bit1, bit2, bit3, bit4 bit1, bit4 specifies row (0,1,2 or 3 in sw decimal) bit2, bit3 specifies column 2-bit output EP(expand and permutate) Input :1 2 34 Output:4 123 2 3 41 01 00 11 10 P4 (permutate) Input :123 4 Output:2 431 00 01 10 11 10 00 01 11 11 00 01 00 10 01 00 11 11 10 01 00 S0 = S1 = 00 10 01 11 11 01 11 10 IP-(inverse of IP)

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Simplified-DES • Plaintext: 01110010 • Key: 1010000010 Ciphertext: 01110111 10-bit key 10 P10 Simplified-DES LS-1 LS-1 P10 (permutate) Input :123456789 10 Output: 35274 10 1986 P8 K, P8 (select and permutate) Input :123456789 10 Output: 637485 109 LS-2 | LS-2 LS-1 (left shift 1 position) ¥5 25 LS-2 (left shift 2 positions) P8 Shit plaietest S-DES (and DES) perform substitutions using S-Boxes • S-Box considered as a matrix: input used to select row/column; selected element is output • 4 bit input: bit1, bit2, bit3, bit4 bit1, bit4 specifies row (0,1, 2 or 3 in Simplified-DES IP (initial permutation) Input :1 234 5678 Output:2 63 14857 • decimal) Sw bit2, bit3 specifies column EP(expand and permutate) Input :1 234 Output:4 12 323 41 • 2-bit output EP 01 00 11 10 00 01 10 11 P4 (permutate) Input :123 4 Output:2 431 11 10 01 00 S1 = 10 00 01 11 11 00 01 00 S0 = 00 10 01 11 11 01 11 10 s1 10 01 00 11 IP-(inverse of IP) IP 64.bit plaintext 64-bit key + p*........ Permutod choice .*** Initial pematation
Transcribed Image Text:Simplified-DES • Plaintext: 01110010 • Key: 1010000010 Ciphertext: 01110111 10-bit key 10 P10 Simplified-DES LS-1 LS-1 P10 (permutate) Input :123456789 10 Output: 35274 10 1986 P8 K, P8 (select and permutate) Input :123456789 10 Output: 637485 109 LS-2 | LS-2 LS-1 (left shift 1 position) ¥5 25 LS-2 (left shift 2 positions) P8 Shit plaietest S-DES (and DES) perform substitutions using S-Boxes • S-Box considered as a matrix: input used to select row/column; selected element is output • 4 bit input: bit1, bit2, bit3, bit4 bit1, bit4 specifies row (0,1, 2 or 3 in Simplified-DES IP (initial permutation) Input :1 234 5678 Output:2 63 14857 • decimal) Sw bit2, bit3 specifies column EP(expand and permutate) Input :1 234 Output:4 12 323 41 • 2-bit output EP 01 00 11 10 00 01 10 11 P4 (permutate) Input :123 4 Output:2 431 11 10 01 00 S1 = 10 00 01 11 11 00 01 00 S0 = 00 10 01 11 11 01 11 10 s1 10 01 00 11 IP-(inverse of IP) IP 64.bit plaintext 64-bit key + p*........ Permutod choice .*** Initial pematation
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