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NEW QUESTION 38
If you XOR 10111000 with 10101010, what is the result?

  • A. 00010010
  • B. 0
  • C. 1
  • D. 2

Answer: A

Explanation:
00010010
https://en.wikipedia.org/wiki/XOR_cipher
1 0 1 1 1 0 0 0
1 0 1 0 1 0 1 0
________________
0 0 0 1 0 0 1 0

 

NEW QUESTION 39
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

Answer: A

Explanation:
Blowfish
https://en.wikipedia.org/wiki/Blowfish_(cipher)
Blowfish is a symmetric-key block cipher, designed in 1993 by Bruce Schneier and included in many cipher suites and encryption products.

 

NEW QUESTION 40
What size block does AES work on?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: D

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 41
Which of the following would be the fastest.

  • A. EC
  • B. RSA
  • C. AES
  • D. DH

Answer: C

Explanation:
AES
https://en.wikipedia.org/wiki/Symmetric-key_algorithm
AES - symmetric cipher. Symmetric keys use the same key for both encryption and decryption. Both the sender and receiver of the data must know and share the secret key. For standard encrypt/decrypt functions, symmetric algorithms generally perform much faster than their asymmetrical counterparts. This is due to the fact that asymmetric cryptography is massively inefficient. Symmetric cryptography is designed precisely for the efficient processing of large volumes of data. In other words, symmetric encryption is generally used for speed and performance, e.g. when there's a large amount of data that needs to be encrypted/protected.
Incorrect answers:
RSA - asymmetric cipher,
DH - Diffie-Hellman key exchange is a method of securely exchanging cryptographic keys over a public channel and was one of the first public-key protocols as conceived by Ralph Merkle and named after Whitfield Diffie and Martin Hellman.
EC - Elliptic-curve cryptography (ECC) is an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields.

 

NEW QUESTION 42
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