Database System Concepts
7th Edition
ISBN: 9789332901384
Author: Henry F. Korth & S. Sudarshan Abraham Silberschatz
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 9, Problem 3PE
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Loophole in the scheme:
- Hackers can modify the Hypertext Markup Language (HTML) source code of the webpage and alter the value of the hidden “price” variable with another value for the price...
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How can I resolve the following issue?
I need help to resolve, thank you.
Let the user choose encryption or decryption.
For encryption, let user input the key in Hexadecimal number, the plain text in Hexadecimal number, output the ciphertext (in hexadecimal numbers).
For decryption, let user input the key in Hexadecimal number, the ciphertext (in hexadecimal numbers), output the decrypted message (Hexadecimal number).
Both encryption and decryption should output the different operation results for each round like the following:
For example:
Round 1:
E(R0) = ...... (Hex or Binary)
K1 = ……
E(Ro) xor K1 =
S-box outputs = ……
f(Ro1, K1) = …..
L2 =R1 =…….
La = Ra
Round 2:
.....•
No Encryption/Decryption libraries or functions provided by the third party are allowed.
Submit your program codes to Moodle with the notes of how to compile and run your program.
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