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NEW QUESTION 20
Which of the following is used to encrypt email and create digital signatures?

• A. DES
• B. RSA
• C. SHA1
• D. AES

Answer: B

Explanation:
RSA
https://en.wikipedia.org/wiki/RSA_(cryptosystem)
RSA use for encryption email and create digital signatures

NEW QUESTION 21
When learning algorithms, such as RSA, it is important to understand the mathematics being used. In RSA, the number of positive integers less than or equal to some number is critical in key generation. The number of positive integers less than or equal to n that are coprime to n is called ______.

• A. Fermat's prime
• B. Fermat's number
• C. Mersenne's number
• D. Euler's totient

Answer: D

Explanation:
Euler's totient
https://en.wikipedia.org/wiki/Euler%27s_totient_function
In number theory, Euler's totient function counts the positive integers up to a given integer n that are relatively prime to n.
Incorrect answers:
Fibonacci number - commonly denoted Fn, form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding ones, starting from 0 and 1.
Fermat's number - named after Pierre de Fermat, who first studied them, is a positive integer of the form Fn = 2^2^n+1 where n is a non-negative integer. The first few Fermat numbers are:
3, 5, 17, 257, 65537, 4294967297, 18446744073709551617, ...
Mersenne prime - prime number that is one less than a power of two. That is, it is a prime number of the form Mn = 2^n - 1 for some integer n. They are named after Marin Mersenne, a French Minim friar, who studied them in the early 17th century.

NEW QUESTION 22
Juanita is attempting to hide some text into a jpeg file. Hiding messages inside another medium is referred to as which one of the following?

• A. Cryptography
• B. Steganalysis
• C. Cryptology
• D. Steganography

Answer: D

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".
Incorrect answers:
Cryptography, or cryptology, is the practice and study of techniques for secure communication in the presence of third parties called adversaries.
Steganalysis - is the study of detecting messages hidden using steganography; this is analogous to cryptanalysis applied to cryptography.

NEW QUESTION 23
What size block does AES work on?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: A

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 24
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