Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

2. Alice is using the one-time pad encryption scheme described in class (and in the book). Her message space, ciphertext space and keyspace are all

image text in transcribed

2. Alice is using the one-time pad encryption scheme described in class (and in the book). Her message space, ciphertext space and keyspace are all {0,1}3 (that is, 3 bits long). She samples her key at random and finds that it is 000. After encrypting her message, she sees that the ciphertext is the same as the plaintext! This seems problematic to her, so she re-samples the key, effectively changing the key distribution. (a) Prove that the resulting encryption scheme, with a key chosen uniformly from {0,1}3 \ {000), is not perfectly secret. (That is, show that the requirement stated in the definition of perfect secrecy is not met.) (b) Intuitively, why is it OK to use key 000 for the one-time pad? 2. Alice is using the one-time pad encryption scheme described in class (and in the book). Her message space, ciphertext space and keyspace are all {0,1}3 (that is, 3 bits long). She samples her key at random and finds that it is 000. After encrypting her message, she sees that the ciphertext is the same as the plaintext! This seems problematic to her, so she re-samples the key, effectively changing the key distribution. (a) Prove that the resulting encryption scheme, with a key chosen uniformly from {0,1}3 \ {000), is not perfectly secret. (That is, show that the requirement stated in the definition of perfect secrecy is not met.) (b) Intuitively, why is it OK to use key 000 for the one-time pad

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

Fundamentals Of Database Systems

Authors: Sham Navathe,Ramez Elmasri

5th Edition

B01FGJTE0Q, 978-0805317558

More Books

Students also viewed these Databases questions

Question

Define promotion.

Answered: 1 week ago

Question

Write a note on transfer policy.

Answered: 1 week ago

Question

Discuss about training and development in India?

Answered: 1 week ago

Question

Explain the various techniques of training and development.

Answered: 1 week ago