Question # 1
| How does Kerberos generate the first secret key in the authentication process?
| | A. By generating a random AES key
| | B. By creating a hash of the user password
| | C. By hashing the user ID, network ID. and salt
| | D. By using the user's public key
|
B. By creating a hash of the user password
Question # 2
| Created in 1977 by Ron Rivest, Adi Shamir, and Leonard Adleman at MIT. Most widely used public key cryptography algorithm. Based on relationships with prime numbers. This algorithm is secure because it is difficult to factor a large integer composed of two or more large prime factors. | | A. PKI | | B. DES
| | C. RSA | | D. Diffie-Helmann
|
C. RSA
Question # 3
| Which of the following is required for a hash?
| | A. Not vulnerable to a brute force attack
| | B. Few collisions
| | C. Must use SALT
| | D. Not reversible
| | E. Variable length input, fixed length output
|
D. Not reversible
E. Variable length input, fixed length output
A hash function is any function that can be used to map data of arbitrary size to fixed-size values. The values returned by a hash function are called hash values, hash codes, digests, or simply hashes. The values are used to index a fixed-size table called a hash table. Use of a hash function to index a hash table is called hashing or scatter storage addressing.
Question # 4
| Bruce Schneier is a well-known and highly respected cryptographer. He has developed several pseudo random number generators as well as worked on teams developing symmetric ciphers. Which one of the following is a symmetric block cipher designed in 1993 by Bruce Schneier team that is unpatented? | | A. Pegasus | | B. Blowfish | | C. SHA1 | | D. AES |
B. Blowfish
Question # 5
| With Electronic codebook (ECB) what happens:
| | A. The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption
| | B. The cipher text from the current round is XORed with the plaintext from the previous round
| | C. The block cipher is turned into a stream cipher
| | D. The cipher text from the current round is XORed with the plaintext for the next round
|
A. The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption
Question # 6
| What is the solution to the equation 8 mod 3?
| | A. 1 | | B. 4 | | C. 3 | | D. 2 |
D. 2
The modulo operation returns the remainder or signed remainder of a division, after one number is divided by another (called the modulus of the operation).
Given two positive numbers a and n, a modulo n (abbreviated as a mod n) is the remainder of the Euclidean division of a by n, where a is the dividend and n is the divisor. The modulo operation is to be distinguished from the symbol mod, which refers to the modulus (or divisor) one is operating from.
For example, the expression "5 mod 2" would evaluate to 1, because 5 divided by 2 has a quotient of 2 and a remainder of 1, while "9 mod 3" would evaluate to 0, because the division of 9 by 3 has a quotient of 3 and a remainder of 0; there is nothing to subtract from 9 after multiplying 3 times 3.
Question # 7
| What is the largest key size that AES can use?
| | A. 256 | | B. 56 | | C. 512 | | D. 128 |
A. 256
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