Exam 312-50v11 topic 1 question 330 discussion

In cryptography, key stretching techniques are used to make a possibly weak key, typically a password or passphrase, more secure against a brute-force attack by increasing the resources (time and possibly space) it takes to test each possible key. Passwords or passphrases created by humans are often short or predictable enough to allow password cracking, and key stretching is intended to make such attacks more difficult by complicating a basic step of trying a single password candidate. Key stretching also improves security in some real-world applications where the key length has been constrained, by mimicking a longer key length from the perspective of a brute-force attacker.[1] https://en.wikipedia.org/wiki/Key_stretching#:~:text=In%20cryptography%2C%20key%20stretching%20techniques,to%20test%20each%20possible%20key.

The technique employed by Kevin to improve the security of encryption keys, based on the information provided, is typically referred to as "Key Derivation." Key derivation is a cryptographic process used to derive a stronger and more secure key from an initial key or a passphrase. The goal is to create keys that are resistant to brute-force attacks and other cryptographic vulnerabilities. Answer is C

C. Key Derivation function

The correct option is A. A. Key stretching

Key stretching is a technique used to enhance the security of cryptographic keys. It involves applying a one-way function, such as a hash function or a key derivation function, to a key multiple times in order to increase the time and resources required for an attacker to brute-force or guess the original key. The idea behind key stretching is to make the key stronger by increasing its length and making it more random-looking. This makes it more difficult for an attacker to guess the original key, even if they have access to the encrypted data and the algorithm used to encrypt it.

Described in other comments

Key Stretching Key stretching refers to processes used to make a weak key stronger, usually by making it longer. This technique helps in defending against brute-force attacks.In the key stretching technique, the initial key is given as input to an algorithm that generates an enhanced key. The key must be sufficiently resistant to brute-force attacks. (P.3137/3121)

A. Key stretching key stretching (uncountable) (cryptography) Techniques used to make a key more secure against brute force attacks by increasing the resources needed to test each possible key.

Key Stretching in correct answer. check CEH v11 Module 20 Page 3121

Key strecthing

C he encrypted the checksum no the message to verify the content

Correct A