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7. Caesar cipher is the earliest known substitution cipher. Please answer the following questions. (a) Encrypt the following message "SECURITY" by translating the letters into numbers, applying the encryption function given, and then translating the numbers back into letters ABCDEFGHIJK L M N O P O R S IU V W XYL 01234 56 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 f(p) = (p+4) mod 26

7. Caesar cipher is the earliest known substitution cipher. Please answer the following questions. (a) Encrypt the following message "SECURITY" by translating the letters into numbers, applying the encryption function given, and then translating the numbers back into letters ABCDEFGHIJK L M N O P O R S IU V W XYL 01234 56 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 f(p) = (p+4) mod 26

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
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7. Caesar cipher is the earliest known substitution cipher. Please answer the following questions. (a) Encrypt the following message "SECURITY" by translating the letters into numbers, applying the encryption function given, and then translating the numbers back into letters ABCDEFGHIJK L M N O P O R S IU V W XYL 0 12 14 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 f(p) = (p+4) mod 26
Transcribed Image Text:7. Caesar cipher is the earliest known substitution cipher. Please answer the following questions. (a) Encrypt the following message "SECURITY" by translating the letters into numbers, applying the encryption function given, and then translating the numbers back into letters ABCDEFGHIJK L M N O P O R S IU V W XYL 0 12 14 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 f(p) = (p+4) mod 26
(b) Suppose the encrypted message is "JEQYVEXXPIVW", what is the plain text (decrypted message)?
Transcribed Image Text:(b) Suppose the encrypted message is "JEQYVEXXPIVW", what is the plain text (decrypted message)?
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