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NEW QUESTION 42
An authentication method that periodically re-authenticates the client by establishing a hash that is then resent from the client is called ______.

• A. CHAP
• B. EAP
• C. SPAP
• D. PAP

Answer: A

Explanation:
CHAP
https://en.wikipedia.org/wiki/Challenge-Handshake_Authentication_Protocol Challenge-Handshake Authentication Protocol (CHAP) is an identity verification protocol that does not rely on sending a shared secret between the access-requesting party and the identity-verifying party (the authenticator). CHAP is based on a shared secret, but in order to authenticate, the authenticator sends a "challenge" message to the access-requesting party, which responds with a value calculated using a "one-way hash" function that takes as inputs the challenge and the shared secret. The authenticator checks the response against its own calculation of the expected hash value. If the values match, the authentication succeeds, otherwise it fails. Following the establishment of an authenticated connection, the authenticator may send a challenge to the access-requesting party at random intervals, to which the access-requesting party will have to produce the correct response.
Incorrect answers:
EAP - A framework that allows for creation of different ways to provide authentication, such as smart cards SPAP - Shiva Password Authentication Protocol, PAP with encryption for the usernames/passwords that are transmitted.
PAP - Password Authentication Protocol. Used to authenticate users, but is no longer used because the information was sent in cleartext.

NEW QUESTION 43
Represents the total number of possible values of keys in a cryptographic algorithm or other security measure, such as a password.

• A. Key Exchange
• B. Key Schedule
• C. Key Space
• D. Key Clustering

Answer: C

Explanation:
Key Space
https://en.wikipedia.org/wiki/Key_space_(cryptography)
Algorithm's key space refers to the set of all possible permutations of a key.
To prevent an adversary from using a brute-force attack to find the key used to encrypt a message, the key space is usually designed to be large enough to make such a search infeasible. On average, half the key space must be searched to find the solution.
Another desirable attribute is that the key must be selected truly randomly from all possible key permutations. Should this not be the case, and the attacker is able to determine some factor that may influence how the key was selected, the search space (and hence also the search time) can be significantly reduced. Humans do not select passwords randomly, therefore attackers frequently try a dictionary attack before a brute force attack, as this approach can often produce the correct answer in far less time than a systematic brute force search of all possible character combinations.

NEW QUESTION 44
What is a "Collision attack" in cryptography?

• A. Collision attacks try to get the public key
• B. Collision attacks try to break the hash into two parts, with the same bytes in each part to get the private key
• C. Collision attacks try to find two inputs producing the same
• D. Collision attacks try to break the hash into three parts to get the plaintext value

Answer: C

Explanation:
Collision attacks try to find two inputs producing the same
https://en.wikipedia.org/wiki/Collision_attack
A collision attack on a cryptographic hash tries to find two inputs producing the same hash value, i.e. a hash collision. This is in contrast to a preimage attack where a specific target hash value is specified.

NEW QUESTION 45
What size block does AES work on?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: C

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 46
What is the formula m^e %n related to?

• A. Encrypting with EC
• B. Decrypting with RSA
• C. Generating Mersenne primes
• D. Encrypting with RSA

Answer: D

Explanation:
Encrypting with RSA
https://en.wikipedia.org/wiki/RSA_(cryptosystem)
RSA Encrypting a message m (number) with the public key (n, e) is calculated:
M' := m^e %n
Incorrect answers:
Decrypting with RSA:
M'' := m^d %n
Generation Mersenne primes:
Mn = 2^n - 1
Encrypting with Elliptic Curve (EC):
y^2 = x^3 + ax + b

NEW QUESTION 47
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