Certified Ethical Hacker (CEH v12) — Question 1

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, because it specifically uses 64-bit blocks and three keys of 56 bits each. The other options do not match these specifications; IDEA uses different block sizes and key lengths, AES operates on different block sizes with a different key management approach, and MD5 is a hashing algorithm, not an encryption method.