For the given scenario where Alice is trying to send encrypted data to Bob, and Bob is trying to decrypt it, using Elgamal encryption scheme, fill the values in the table ParameterScenarioBob chooses p, a large prime173Bob chooses a, primitive element in ZnBob chooses Kpr = d E {2,3, ., p-2}Bob computes Kpub = ß = aª mod pp, a, and ß are sent to AliceAlice chooses i in {2,3,..., p-2}7....:Alice computes KẸ = a' mod pAlice computes KM=B'mod p3Alice's message to send is x € Z*,Alice encrypts message x, y=x*KM mod pAlice sends KE and y to BobBob computes KM=Kg°mod pBob computes KM' mod pBob computes x = y* KM mod p

Answered: Parameter Scenario Bob chooses p, a…

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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For the given scenario where Alice is trying to send encrypted data to Bob, and Bob is trying to decrypt it, using Elgamal encryption scheme, fill the values in the table

Parameter
Scenario
Bob chooses p, a large prime
17
3
Bob chooses a, primitive element in Zn
Bob chooses Kpr = d E {2,3, ., p-2}
Bob computes Kpub = ß = aª mod p
p, a, and ß are sent to Alice
Alice chooses i in {2,3,..., p-2}
7
....:
Alice computes KẸ = a' mod p
Alice computes KM=B'mod p
3
Alice's message to send is x € Z*,
Alice encrypts message x, y=x*KM mod p
Alice sends KE and y to Bob
Bob computes KM=Kg°mod p
Bob computes KM' mod p
Bob computes x = y* KM mod p

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