Certified Ethical Hacker CEH · Free Practice Question Hard
Question 51
Frank and John have started a secret club together. They want to ensure that when they send messages to each other, they are truly unbreakable. What encryption key would provide the STRONGEST and MOST secure encryption?
- A DES with a 56-bit key
- B AES with a 256-bit key
- C ECC with a 256-bit key
- D Randomized one-time use pad
Reveal correct answer
Correct answer: D
Explanation
OBJ-9.1: The only truly unbreakable encryption is one that uses a one-time use pad. This ensures that every message is encrypted with a different shared key that only the two owners of the one-time use pad would know. This technique ensures that there is no pattern in the key for an attacker to guess or find. Even if one of the messages could be broken, all of the other messages would remain secure since they use different keys to encrypt them. Unfortunately, one-time use pads require that two identical copies of the pad are produced and distributed securely before they can be used. DES and AES both rely on a single shared secret key, making it vulnerable to attack. DES has already been broken, while AES remains unbroken (today). With enough time and computing power, though, an AES key could be discovered. RSA is also vulnerable to attack with enough time and computing power.Discussion
Think the marked answer is wrong, or have a better explanation? Share it below — comments appear after review.
You must be logged in to post a comment.
