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NEW QUESTION 37
Which of the following are valid key sizes for AES (choose three)?

  • A. 0
  • B. 1
  • C. 2
  • D. 3
  • E. 4
  • F. 5

Answer: A,B,E

Explanation:
Correct answers: 128, 192, 256
https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
The Advanced Encryption Standard (AES), also known by its original name Rijndael, is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology (NIST) in 2001.
AES is a subset of the Rijndael block cipher developed by two Belgian cryptographers, Vincent Rijmen and Joan Daemen, who submitted a proposal to NIST during the AES selection process. 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 38
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. Blowfish
  • B. SHA1
  • C. AES
  • D. Pegasus

Answer: D

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 39
A transposition cipher invented 1918 by Fritz Nebel, used a 36 letter alphabet and a modified Polybius square with a single columnar transposition.

  • A. Cipher Disk
  • B. ROT13 Cipher
  • C. ADFVGX Cipher
  • D. Book Ciphers

Answer: C

Explanation:
ADFVGX Cipher
https://en.wikipedia.org/wiki/ADFGVX_cipher
ADFGVX cipher was a field cipher used by the German Army on the Western Front during World War
I. ADFGVX was in fact an extension of an earlier cipher called ADFGX.
Invented by Lieutenant Fritz Nebel (1891-1977) and introduced in March 1918, the cipher was a fractionating transposition cipher which combined a modified Polybius square with a single columnar transposition.
Incorrect answers:
Book Ciphers – or Ottendorf cipher, is a cipher in which the key is some aspect of a book or other piece of text. Books, being common and widely available in modern times, are more convenient for this use than objects made specifically for cryptographic purposes. It is typically essential that both correspondents not only have the same book, but the same edition.
Cipher Disk – enciphering and deciphering tool developed in 1470 by the Italian architect and author Leon Battista Alberti. He constructed a device, (eponymously called the Alberti cipher disk) consisting of two concentric circular plates mounted one on top of the other. The larger plate is called the “stationary” and the smaller one the “moveable” since the smaller one could move on top of the “stationary” ROT13 Cipher – 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 40
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