Answered step by step
Verified Expert Solution
Question
1 Approved Answer
question b. Thanks Problem 1 [Perfect Secrecy] (10 Points) An encryption scheme (Gen, Enc, Dec) with message space M is perfectly secret if for every
question b. Thanks
Problem 1 [Perfect Secrecy] (10 Points) An encryption scheme (Gen, Enc, Dec) with message space M is perfectly secret if for every m, m' e M, every ceC Pr [Enck(m) = c) = Pr [Enck(m') = c] where the probabilities are over the choice of k. Do the following encryption schemes have perfectly secrecy if the key k is sampled uniformly from the key space? Justify your answer. (a) M= {0,1,2,3} K = {0, 1, 2, 3, 4} Enck(m) = k + m (mod 4) Deck(c) = c-k (mod 4) (b) M= {m = m'||0|m' {0,1}l-1} K = {{0, 1}l-1} Enck(m = m'||0) = m' k Deck(c) = ck||0Step by Step Solution
There are 3 Steps involved in it
Step: 1
Get Instant Access to Expert-Tailored Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started