Use symmetric ciphers to encrypt message "promise" and decrypt message "FOG". The representation of characters in modulo 26 is described as follows: Plaintext a b cdefghijk1 mn 0parst u vwxyz CiphertextA B|c|D|E|FG|HIJKLMNOP|Q|Rs]T|U]v wxYZ Value 00 01 02 03 04 05 06 07 08 09|10|11 12 13 14 15|16 17 18 19 20 21 22|23 24 25 q| r The mathematical equations for encryption and decryption can be described as follows: Encryption E :i→i+k mod 26 Decryption D :i→i-k mod 26 (k) i represents the messages (plaintext or cipher), k represents a symmetric key. In this case k=20

Use symmetric ciphers to encrypt message "promise" and decrypt message "FOG". The representation of characters in modulo 26 is described as follows: Plaintext a b cdefghijk1 mn 0parst u vwxyz CiphertextA B|c|D|E|FG|HIJKLMNOP|Q|Rs]T|U]v wxYZ Value 00 01 02 03 04 05 06 07 08 09|10|11 12 13 14 15|16 17 18 19 20 21 22|23 24 25 q| r The mathematical equations for encryption and decryption can be described as follows: Encryption E :i→i+k mod 26 Decryption D :i→i-k mod 26 (k) i represents the messages (plaintext or cipher), k represents a symmetric key. In this case k=20

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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Use symmetric ciphers to encrypt message "“promise" and decrypt message "FOG".
The representation of characters in modulo 26 is described as follows:
Plaintext -
a bcdefg|hijk1 mnopar stuvwx y z
Ciphertext A BCD|EFG|HIJKL|M|NO|P|Q|R s T|U|VwxY|Z
Value 00 01 02|03 04 05 06|07|08|09|10|11 12|13|14|15 16|17 18|19 20 21 22 23 24 25
The mathematical equations for encryption and decryption can be described as follows:
Encryption Ea:i→i+kmod 26
Decryption Da : i→i-k mod 26
i represents the messages (plaintext or cipher), k represents a symmetric key. In
this case k=20

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