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NEW QUESTION 51
Which one of the following terms describes two numbers that have no common factors?

Answer: A

Explanation:
Coprime
https://en.wikipedia.org/wiki/Coprime_integers
In number theory, two integers a and b are said to be relatively prime, mutually prime, or coprime if the only positive integer (factor) that divides both of them is 1. Consequently, any prime number that divides one of a or b does not divide the other. This is equivalent to their greatest common divisor (gcd) being 1.
Incorrect answers:
Convergent - a series is the sum of the terms of an infinite sequence of numbers.
Euler's totient function - counts the positive integers up to a given integer n that are relatively prime to n. It is written using the Greek letter phi as ?(n) or ?(n), and may also be called Euler's phi function. In other words, it is the number of integers k in the range 1 ? k ? n for which the greatest common divisor gcd(n, k) is equal to 1. The integers k of this form are sometimes referred to as totatives of n.
Fermat's number - named after Pierre de Fermat, who first studied them, is a positive integer of the form where n is a non-negative integer.

NEW QUESTION 52
Manipulating individuals so that they will divulge confidential information, rather than by breaking in or using technical cracking techniques.

Answer: D

Explanation:
Social engineering attack
https://en.wikipedia.org/wiki/Social_engineering_(security)
Social engineering is the psychological manipulation of people into performing actions or divulging confidential information. This differs from social engineering within the social sciences, which does not concern the divulging of confidential information. A type of confidence trick for the purpose of information gathering, fraud, or system access, it differs from a traditional "con" in that it is often one of many steps in a more complex fraud scheme.
Incorrect answers:
Replay attack - (also known as playback attack) is a form of network attack in which a valid data transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator or by an adversary who intercepts the data and re-transmits it, possibly as part of a masquerade attack by IP packet substitution. This is one of the lower tier versions of a "Man-in-the-middle attack." Side-channel attack - is any attack based on information gained from the implementation of a computer system, rather than weaknesses in the implemented algorithm itself (e.g. cryptanalysis and software bugs). Timing information, power consumption, electromagnetic leaks or even sound can provide an extra source of information, which can be exploited.
Linear cryptanalysis - is a general form of cryptanalysis based on finding affine approximations to the action of a cipher. Attacks have been developed for block ciphers and stream ciphers. Linear cryptanalysis is one of the two most widely used attacks on block ciphers; the other being differential cryptanalysis.

NEW QUESTION 53
The ATBASH cipher is best described as what type of cipher?

Answer: D

Explanation:
Substitution
https://en.wikipedia.org/wiki/Atbash
Atbash is a monoalphabetic substitution cipher originally used to encrypt the Hebrew alphabet. It can be modified for use with any known writing system with a standard collating order.

NEW QUESTION 54
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