Explain why a brute-force attack on Double DES requires about 257 opera- tions.
Added by Nicholas H.
Step 1
Double DES (2DES) is a symmetric key block cipher that applies the DES encryption algorithm twice on the same plaintext block with two different keys. The encryption process is as follows: C = E(K2, E(K1, P)), where C is the ciphertext, P is the plaintext, and K1 Show more…
Show all steps
Your feedback will help us improve your experience
Sanchit Jain and 77 other AP CS educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
How is cryptanalysis different from brute-force attack?
1.46. Explain why the cipher e_k(m) = k ⊕ m and d_k(c) = k ⊕ c defined by XOR of bit strings is not secure against a chosen plaintext attack. Demonstrate your attack by finding the private key used to encrypt the 16-bit ciphertext c = 1001010001010111 if you know that the corresponding plaintext is m = 0010010000101100.
Sri K.
In Linux, the password hash is produced by applying a hash function for many rounds (e.g., 5000 rounds for SHA-512). This seems to waste time. Why does Linux do this?
Supreeta N.
Recommended Textbooks
Computer Science and Information Technology
Introduction to Programming Using Python
Computer Science - An Overview
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD