Consider a simple system with 8-bit block size. Assume the encryption (and decryption) to be a simple XOR of the key with the input. In other words, to encrypt x with k we simply perform x⊕k giving y. Similarly, to decrypt y, we perform y⊕k giving x. You are given the following 16-bit input “F5C6” in hexadecimal. You are provided IV as “8C” in hexadecimal. The key to be used (where appropriate) is “49” in hexadecimal. Compute the encrypted output with the following methods. Express your final answer, for each of them, as 4 hexadecimal characters so it is easy to read. A. Using ECB B. Using CBC C. Using OFB D. Using CFB
Consider a simple system with 8-bit block size. Assume the encryption (and decryption) to be a simple XOR of the key with the input. In other words, to encrypt x with k we simply perform x⊕k giving y. Similarly, to decrypt y, we perform y⊕k giving x. You are given the following 16-bit input “F5C6” in hexadecimal. You are provided IV as “8C” in hexadecimal. The key to be used (where appropriate) is “49” in hexadecimal. Compute the encrypted output with the following methods. Express your final answer, for each of them, as 4 hexadecimal characters so it is easy to read. A. Using ECB B. Using CBC C. Using OFB D. Using CFB
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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Consider a simple system with 8-bit block size. Assume the encryption (and decryption) to be a simple XOR of the key with the input. In other words, to encrypt x with k we simply perform x⊕k giving y. Similarly, to decrypt y, we perform y⊕k giving x.
You are given the following 16-bit input “F5C6” in hexadecimal. You are provided IV as “8C” in hexadecimal. The key to be used (where appropriate) is “49” in hexadecimal. Compute the encrypted output with the following methods. Express your final answer, for each of them, as 4 hexadecimal characters so it is easy to read.
A. Using ECB
B. Using CBC
C. Using OFB
D. Using CFB
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