Certified Ethical Hacker (CEH v13) — Question 4

In this form of encryption algorithm, every individual block contains 64-bit data, and three keys are used, where each key consists of 56 bits. Which is this encryption algorithm?

Answer options

• A. IDEA
• B. Triple Data Encryption Standard
• C. AES
• D. MD5 encryption algorithm

Correct answer: B

Explanation

The correct answer is B, Triple Data Encryption Standard, as it specifically operates on 64-bit blocks and employs three keys of 56 bits each. Option A, IDEA, uses a different block size and key structure, while C, AES, operates on 128-bit blocks and does not use 56-bit keys. Option D, MD5, is a hashing algorithm, not an encryption one.