• 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
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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I need a solution within 15. Best wishes, Ton
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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