User authentication is a procedure that allows communicating parties to verify that the contents of a received message have not been altered and that the source is authentic. Select one: True False Question 19 Not yet answered Points out of 5 Not flaggedFlag question Question text Objects that a user possesses for the purpose of user authentication are called Answer Question 20 Not yet answered Points out of 5 Not flaggedFlag question Question text To counter threats to remote user authentication, systems generally rely on some form of protocol. Select one: a. eavesdropping b. Trojan horse c. challenge-response d. denial-of-service

Write a program called assignment3 (saved in a file assignment3.java) that computes the greatest common divisor of two given integers. one of the oldest numerical algorithms was described by the greek mathematician, euclid, in 300 b.c. it is a simple but very e↵ective algorithm that computes the greatest common divisor of two given integers. for instance, given integers 24 and 18, the greatest common divisor is 6, because 6 is the largest integer that divides evenly into both 24 and 18. we will denote the greatest common divisor of x and y as gcd(x, y). the algorithm is based on the clever idea that the gcd(x, y) = gcd(x ! y, y) if x > = y and gcd(x, y) = gcd(x, y ! x) if x < y. the algorithm consists of a series of steps (loop iterations) where the “larger” integer is replaced by the di↵erence of the larger and smaller integer. this continues until the two values are equal. that is then the gcd.

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