9.10. Let F be a secure block cipher with blocklength 2. Below is an encryption scheme for plaintexts M = {0, 1}². Formally describe its decryption algorithm and show that it does not have CCA security. Enc(k, m): re {0,1}^ c1 := F(k,r) C2 := r O F(k, m) return (c1, c2) KeyGen: k+ {0, 1}^ return k
9.10. Let F be a secure block cipher with blocklength 2. Below is an encryption scheme for plaintexts M = {0, 1}². Formally describe its decryption algorithm and show that it does not have CCA security. Enc(k, m): re {0,1}^ c1 := F(k,r) C2 := r O F(k, m) return (c1, c2) KeyGen: k+ {0, 1}^ return k
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
Related questions
Question
![9.10. Let F be a secure block cipher with blocklength 2. Below is an encryption scheme for
plaintexts M = {0, 1}². Formally describe its decryption algorithm and show that it does
not have CCA security.
Enc(k, m):
re {0,1}^
c1 := F(k,r)
C2 := r F(k, m)
return (c1, c2)
KeyGen:
k + {0, 1}^
return k](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F16eacc05-7dd3-4fb8-b350-d200f81ad4fd%2Fa0ca9f05-0303-4dff-8c61-9bf334a0e9d0%2Fciar8kh_processed.png&w=3840&q=75)
Transcribed Image Text:9.10. Let F be a secure block cipher with blocklength 2. Below is an encryption scheme for
plaintexts M = {0, 1}². Formally describe its decryption algorithm and show that it does
not have CCA security.
Enc(k, m):
re {0,1}^
c1 := F(k,r)
C2 := r F(k, m)
return (c1, c2)
KeyGen:
k + {0, 1}^
return k
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