Info
Warning
Danger
/ Homework Answers / Accounting / Question Show that CBC encryption

Question

Question

Show that CBC encryption where the IV is random but known in advance is not indistinguishable, under chosen plaintext attack. Directions: assume attacker sees the ciphertext blocks c1 , c2 resulting from CBC encryption of plaintext messages m1, m2. Furthermore, attacker is now given a random value I, to be used in CBC encryption of a message X that the attacker can choose. The attacker is given the result of that encryption; e.g., if X is exactly one block long, then attacker is given the output of E(X LI). Show that this allows attacker to find if m2 is a block of all zeros or block of all 1 bits. Conclude that such CBC encryption is not CPA-IND.

 

Solution
5 (1 Ratings )

Solved
Accounting 3 Months Ago 244 Views
This Question has Been Answered!
Premium Content -

Unlimited Access

Explore More than 2 Million+
  • Textbook Solutions
  • Flashcards
  • Homework Answers
  • Documents
Signup for Better Grades!

Ask an Expert

Our Experts can answer your tough homework and study questions
124306 Accounting Questions Answered!
Post a Question

Welcome Back!

ScholarOn has more then 20 Million answers, flashcards & more being added everyday!

or
Forgot?
Login
Don't have an account? Signup

Join ScholarOn

ScholarOn has more then 20 Million answers, flashcards & more being added everyday!

or
Signup
By registering, I agree to the Terms and Privacy Policies
Already have an account? Log in

Verify Your Email

Check your inbox & click on the link to activate your account.

Resend Email
Verification Mail Send Successfully. Please Check Your Email.

Forgot Password

Please enter your registered email to recieve the password reset link.

Send reset link
Already have an account? Log in
Did you know?

ScholarOn has more than 2 Million+ answers, textbook solutions & flashcards. Explore Now!

Let us boost your grade together!