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NEW QUESTION 41
What is a salt?

A. Key rotationB. Random bits intermixed with a symmetric cipher to increase randomness and make it more secureC. Key whiteningD. Random bits intermixed with a hash to increase randomness and reduce collisions

Answer: D

Explanation:
Random bits intermixed with a hash to increase randomness and reduce collisions
https://en.wikipedia.org/wiki/Salt_(cryptography)
Salt is random data that is used as an additional input to a one-way function that hashes data, a password or passphrase. Salts are used to safeguard passwords in storage. Historically a password was stored in plaintext on a system, but over time additional safeguards were developed to protect a user's password against being read from the system. A salt is one of those methods.
Incorrect answers:
Key whitening - a technique used to increase the security of block ciphers. It consists of steps that combine the data with portions of the key (most commonly using a simple XOR) before the first round and after the last round of encryption.
Key rotation - is when you retire an encryption key and replace that old key by generating a new cryptographic key. Rotating keys on a regular basis help meet industry standards and cryptographic best practices.
Random bits intermixed with a symmetric cipher to increase randomness and make it more secure - Initialization Vector (IV)

 

NEW QUESTION 42
Ciphers that write message letters out diagonally over a number of rows then read off cipher row by row. Also called zig-zag cipher.

A. Null CipherB. Vigenere CipherC. ROT-13D. Rail Fence Cipher

Answer: D

Explanation:
Rail Fence Cipher
https://en.wikipedia.org/wiki/Rail_fence_cipher
The rail fence cipher (also called a zigzag cipher) is a form of transposition cipher. It derives its name from the way in which it is encoded.
Incorrect answers:
Null cipher - also known as concealment cipher, is an ancient form of encryption where the plaintext is mixed with a large amount of non-cipher material. Today it is regarded as a simple form of steganography, which can be used to hide ciphertext.
Vigenere cipher - is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution.
ROT13 - ("rotate by 13 places", sometimes hyphenated ROT-13) is a simple letter substitution cipher that replaces a letter with the 13th letter after it, in the alphabet. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome.

 

NEW QUESTION 43
Which of the following is assured by the use of a hash?

A. AuthenticationB. IntegrityC. ConfidentialityD. Availability

Answer: B

Explanation:
Integrity
https://en.wikipedia.org/wiki/Cryptographic_hash_function#Verifying_the_integrity_of_messages_and_files An important application of secure hashes is verification of message integrity. Comparing message digests (hash digests over the message) calculated before, and after, transmission can determine whether any changes have been made to the message or file.

 

NEW QUESTION 44
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