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NEW QUESTION 51 Created by D. H. Lehmer. It is a classic example of a Linear congruential generator. A PRNG type of linear congruential generator (LCG) that operates in multiplicative group of integers modulo n. The basic algorithm is Xi+1=(aXi + c) mod m, with 0 ≤ Xi ≤ m.

• A. Blum Blum Shub
• B. Lehmer Random Number Generator
• C. Lagged Fibonacci Generator
• D. Linear Congruential Generator

Answer: B Explanation: Lehmer Random Number Generator https://en.wikipedia.org/wiki/Lehmerrandomnumbergenerator The Lehmer random number generator (named after D. H. Lehmer), sometimes also referred to as the Park-Miller random number generator (after Stephen K. Park and Keith W. Miller), is a type of linear congruential generator (LCG) that operates in multiplicative group of integers modulo n. The general formula is: where the modulus m is a prime number or a power of a prime number, the multiplier a is an element of high multiplicative order modulo m (e.g., a primitive root modulo n), and the seed X0 is coprime to m. Other names are multiplicative linear congruential generator (MLCG) and multiplicative congruential generator (MCG).   NEW QUESTION 52 If the round function is a cryptographically secure pseudorandom function, then __rounds is sufficient to make it a "strong" pseudorandom permutation.

• A. 0
• B. 1
• C. 2
• D. 3

Answer: C Explanation: 4 https://en.wikipedia.org/wiki/Feistel_cipher Michael Luby and Charles Rackoff analyzed the Feistel cipher construction, and proved that if the round function is a cryptographically secure pseudorandom function, with Ki used as the seed, then 3 rounds are sufficient to make the block cipher a pseudorandom permutation, while 4 rounds are sufficient to make it a "strong" pseudorandom permutation (which means that it remains pseudorandom even to an adversary who gets oracle access to its inverse permutation). Because of this very important result of Luby and Rackoff, Feistel ciphers are sometimes called Luby-Rackoff block ciphers.   NEW QUESTION 53 Which of the following asymmetric algorithms is described by U.S. Patent 5,231,668 and FIPS 186

• A. AES
• B. RSA
• C. RC4
• D. DSA

Answer: D Explanation: DSA https://ru.wikipedia.org/wiki/DSA The National Institute of Standards and Technology (NIST) proposed DSA for use in their Digital Signature Standard (DSS) in 1991, and adopted it as FIPS 186 in 1994. DSA is covered by U.S. Patent 5,231,668 , filed July 26, 1991 and now expired, and attributed to David W. Kravitz, a former NSA employee.   NEW QUESTION 54 ____________cryptography uses one key to encrypt a message and a different key to decrypt it.

• A. Stream
• B. Symmetric
• C. Asymmetric
• D. Secure

Answer: C Explanation: Asymmetric https://en.wikipedia.org/wiki/Public-key_cryptography Public-key cryptography, or asymmetric cryptography, is a cryptographic system that uses pairs of keys: public keys, which may be disseminated widely, and private keys, which are known only to the owner. The generation of such keys depends on cryptographic algorithms based on mathematical problems to produce one-way functions. Effective security only requires keeping the private key private; the public key can be openly distributed without compromising security.   NEW QUESTION 55 ......