Chapter 8: Problem 9 Previous Problem Problem List Next Problem Results for this submission Entered 49 146 Answer Preview Result 49 146 incorrect incorrect At least one of the answers above is NOT correct. (1 point) Alice and Bob are using the ElGamal cipher with the parameters p = 193 and a = = 5. = = Alice makes the mistake of using the same ephemeral key for two plaintexts, x1 and x 2. The eavesdropper Eve suspects that x1 146. She sees the two ciphertexts y1 = 141 and y2 = = 167 in transit; these are the encryptions of x1 and x2, respectively. a) What is the masking key kм? 49 b) What is the plaintext x2 ? 146

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
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Chapter 8: Problem 9
Previous Problem
Problem List
Next Problem
Results for this submission
Entered
49
146
Answer Preview
Result
49
146
incorrect
incorrect
At least one of the answers above is NOT correct.
(1 point) Alice and Bob are using the ElGamal cipher with the parameters p = 193 and a = = 5.
=
=
Alice makes the mistake of using the same ephemeral key for two plaintexts, x1 and x 2. The eavesdropper
Eve suspects that x1 146. She sees the two ciphertexts y1
= 141 and y2 = = 167 in transit; these are the
encryptions of x1 and x2, respectively.
a) What is the masking key kм?
49
b) What is the plaintext x2 ?
146
Transcribed Image Text:Chapter 8: Problem 9 Previous Problem Problem List Next Problem Results for this submission Entered 49 146 Answer Preview Result 49 146 incorrect incorrect At least one of the answers above is NOT correct. (1 point) Alice and Bob are using the ElGamal cipher with the parameters p = 193 and a = = 5. = = Alice makes the mistake of using the same ephemeral key for two plaintexts, x1 and x 2. The eavesdropper Eve suspects that x1 146. She sees the two ciphertexts y1 = 141 and y2 = = 167 in transit; these are the encryptions of x1 and x2, respectively. a) What is the masking key kм? 49 b) What is the plaintext x2 ? 146
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