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NEW QUESTION 35
What size block does AES work on?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: B

Explanation:
128
https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
Rijndael is a family of ciphers with different key and block sizes. For AES, NIST selected three members of the Rijndael family, each with a block size of 128 bits, but three different key lengths: 128, 192 and 256 bits.

NEW QUESTION 36
Which one of the following attempts to hide data in plain view?

• A. Cryptography
• B. Steganography
• C. Substitution
• D. Asymmetric cryptography

Answer: B

Explanation:
Steganography
https://en.wikipedia.org/wiki/Steganography
Steganography is the practice of concealing a file, message, image, or video within another file, message, image, or video. The word steganography comes from Greek steganographia, which combines the words steganos , meaning "covered or concealed", and -graphia meaning "writing".

NEW QUESTION 37
What is the name of the attack where the attacker obtains the ciphertexts corresponding to a set of plaintexts of his own choosing?

• A. Kasiski examination
• B. Differential cryptanalysis
• C. Known-plaintext attack
• D. Chosen plaintext

Answer: D

Explanation:
Chosen plaintext
https://en.wikipedia.org/wiki/Chosen-plaintext_attack
A chosen-plaintext attack (CPA) is an attack model for cryptanalysis which presumes that the attacker can obtain the ciphertexts for arbitrary plaintexts. The goal of the attack is to gain information that reduces the security of the encryption scheme.
Incorrect answers:
Differential cryptanalysis - is a general form of cryptanalysis applicable primarily to block ciphers, but also to stream ciphers and cryptographic hash functions. In the broadest sense, it is the study of how differences in information input can affect the resultant difference at the output. In the case of a block cipher, it refers to a set of techniques for tracing differences through the network of transformation, discovering where the cipher exhibits non-random behavior, and exploiting such properties to recover the secret key (cryptography key).
Known-plaintext attack - (KPA) is an attack model for cryptanalysis where the attacker has access to both the plaintext (called a crib), and its encrypted version (ciphertext). These can be used to reveal further secret information such as secret keys and code books.
Kasiski examination - (also referred to as Kasiski's test or Kasiski's method) is a method of attacking polyalphabetic substitution ciphers, such as the Vigenere cipher. It was first published by Friedrich Kasiski in 1863, but seems to have been independently discovered by Charles Babbage as early as 1846. In polyalphabetic substitution ciphers where the substitution alphabets are chosen by the use of a keyword, the Kasiski examination allows a cryptanalyst to deduce the length of the keyword. Once the length of the keyword is discovered, the cryptanalyst lines up the ciphertext in n columns, where n is the length of the keyword. Then each column can be treated as the ciphertext of a monoalphabetic substitution cipher. As such, each column can be attacked with frequency analysis.

NEW QUESTION 38
What is a variation of DES that uses a technique called Key Whitening?

• A. Blowfish
• B. DESX
• C. 3DES
• D. AES

Answer: B

Explanation:
DESX
https://en.wikipedia.org/wiki/DES-X
In cryptography, DES-X (or DESX) is a variant on the DES (Data Encryption Standard) symmetric-key block cipher intended to increase the complexity of a brute-force attack using a technique called key whitening.

NEW QUESTION 39
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