Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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You may use a software to do calculations but you have to write down the details.
The correspondence of letters table:
A
01
B C D E F GH I J K L M
02 03 04 05 06 07 08 09 10 11 12 13
TU V W X Y
N O P Q R
14 15 16 17 18
Z space
S
19 20 21 22 23 24 25 26 00
4. Decipher the message "NUMBER", which was enciphered using the blocked
cipher that sends the plaintext block (x₁, x2) into the ciphertext block (y₁, y2) with
2
(22) = (₂¹9) (2)
mod 27.
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Transcribed Image Text:You may use a software to do calculations but you have to write down the details. The correspondence of letters table: A 01 B C D E F GH I J K L M 02 03 04 05 06 07 08 09 10 11 12 13 TU V W X Y N O P Q R 14 15 16 17 18 Z space S 19 20 21 22 23 24 25 26 00 4. Decipher the message "NUMBER", which was enciphered using the blocked cipher that sends the plaintext block (x₁, x2) into the ciphertext block (y₁, y2) with 2 (22) = (₂¹9) (2) mod 27.
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