EMT Practice Test

1. Question Content...

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Question1: John is responsible for VPNs at his company. He is using IPSec because it has two different modes. He can choose the mode appropriate for a given situation. What are the two modes of IPSec? (Choose two)

Question2: Developed by Netscape and has been replaced by TLS. It was the preferred method used with secure websites.

Question3: In 2007, this wireless security algorithm was rendered useless by capturing packets and discovering the passkey in a matter of seconds. This security flaw led to a network invasion of TJ Maxx and data theft through a technique known as wardriving.
Which Algorithm is this referring to?

Question4: Which of the following would be the weakest encryption algorithm?

Question5: Which one of the following is a symmetric key system using 64-bit blocks?

Question6: RFC 1321 describes what hash?

Question7: If Bob is using asymmetric cryptography and wants to send a message to Alice so that only she can decrypt it, what key should he use to encrypt the message?

Question8: Protocol suite provides a method of setting up a secure channel for protected data exchange between two devices.

Question9: Which of the following is generally true about key sizes?

Question10: Which of the following is a cryptographic protocol that allows two parties to establish a shared key over an insecure channel?

Question11: A linear congruential generator is an example of what?

Question12: Which of the following techniques is used (other than brute force) to attempt to derive a key?

Question13: Which one of the following is an authentication method that sends the username and password in cleartext?

Question14: Denis is looking at an older system that uses DES encryption. A colleague has told him that DES is insecure due to a small key size. What is the key length used for DES?

Question15: What is the formula m^e %n related to?

Question16: Bob's password is hashed, and so is John's. Even though they used different passwords, the hash is the same. What is this called?

Question17: The most widely used asymmetric encryption algorithm is what?

Question18: Collision resistance is an important property for any hashing algorithm. Joan wants to find a cryptographic hash that has strong collision resistance. Which one of the following is the most collisionresistant?

Question19: This algorithm was published by the German engineering firm Seimans in 1993. It is a software based stream cipher using Lagged Fibonacci generator along with a concept borrowed from the shrinking generator ciphers.

Question20: A cryptographic hash function which uses a Merkle tree-like structure to allow for immense parallel computation of hashes for very long inputs. Authors claim a performance of 28 cycles per byte for MD6-256 on an Intel Core 2 Duo and provable resistance against differential cryptanalysis.

Question21: What is an IV?

Question22: You are trying to find a modern method for security web traffic for use in your company's ecommerce web site. Which one of the following is used to encrypt web pages and uses bilateral authentication?

Question23: John is trying to explain the basics of cryptography to a group of young, novice, security students. Which one of the following most accurately defines encryption?

Question24: In relationship to hashing, the term _____refers to random bits that are used as one of the inputs to the hash. Essentially the ______ is intermixed with the message that is to be hashed

Question25: What is the basis for the difficulty in breaking RSA?

Question26: Which of the following is a fundamental principle of cryptography that holds that the algorithm can be publicly disclosed without damaging security?

Question27: A type of frequency analysis used to attack polyalphabetic substitution ciphers. It's used to try to discover patterns and use that information to decrypt the cipher.

Question28: What is a "Collision attack" in cryptography?

Question29: In 1977 researchers and MIT described what asymmetric algorithm?

Question30: What size block does FORK256 use?

Question31: 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 ______.

Question32: Manipulating individuals so that they will divulge confidential information, rather than by breaking in or using technical cracking techniques.

Question33: Which of the following Secure Hashing Algorithm (SHA) produces a 160-bit digest from a message with a maximum length of (264-1) bits and resembles the MD5 algorithm?

Question34: Which of the following algorithms uses three different keys to encrypt the plain text?

Question35: Which one of the following uses three different keys, all of the same size?

Question36: MD5 can best be described as which one of the following?

Question37: Which of the following is an asymmetric cipher?

Question38: Which of the following asymmetric algorithms is described by U.S. Patent 5,231,668 and FIPS 186

Question39: You are explaining basic mathematics to beginning cryptography students. You are covering the basic math used in RSA. A prime number is defined as

Question40: John is going to use RSA to encrypt a message to Joan. What key should he use?

Question41: Hash. Created by Ronald Rivest. Replaced MD4. 128 bit output size, 512 bit block size, 32 bit word size, 64 rounds. Infamously compromised by Flame malware in 2012.

Question42: Which of the following is a substitution cipher used by ancient Hebrew scholars?

Question43: Part of understanding cryptography is understanding the cryptographic primitives that go into any crypto system. A(n) _______ is a fixed-size input to a cryptographic primitive that is random or pseudorandom.

Question44: During the process of encryption and decryption, what keys are shared?

Question45: With Cipher feedback (CFB) what happens?

Question46: Encryption of the same plain text with the same key results in the same cipher text. Use of an IV that is XORed with the first block of plain text solves this problem.

Question47: Ferris has been assigned the task of selecting security for his company's wireless network. It is important that he pick the strongest form of wireless security. Which one of the following is the strongest wireless security?

Question48: A measure of the uncertainty associated with a random variable.

Question49: Which of the following is a protocol for exchanging keys?

Question50: Network of trusted certificate authority servers. Use asymmetric key pairs and combines software, encryption and services to provide a means of protecting security of business communication and transactions.

Question51: What is Kerchoff's principle?

Question52: With Cipher-block chaining (CBC) what happens?

Question53: A number that is used only one time, then discarded is called what?

Question54: What is the name of the attack where the attacker obtains the ciphertexts corresponding to a set of plaintexts of his own choosing?

Question55: Which one of the following are characteristics of a hash function? (Choose two)

Question56: A disk you rotated to encrypt/decrypt. Created by Leon Alberti. Similar technologies were used in the Enigma machine. Considered the forefather of modern encryption.

Question57: Hash algortihm created by the Russians. Produces a fixed length output of 256bits. Input message is broken up into 256 bit blocks. If block is less than 256 bits then it is padded with 0s.

Question58: Fred is using an operating system that stores all passwords as an MD5 hash. What size is an MD5 message digest (hash)?

Question59: A symmetric Stream Cipher published by the German engineering firm Seimans in 1993. A software based stream cipher that uses a Lagged Fibonacci generator along with concepts borrowed from shrinking generator ciphers.

Question60: Software for maintaining an on-the-fly-encrypted volume. Data is automatically encrypted right before it is saved, then decrypted right after it is loaded, all w/o user intervention.

Question61: Which of the following equations is related to EC?

Question62: Changing some part of the plain text for some matching part of cipher text. Historical algorithms typically use this.

Question63: In IPSec, if the VPN is a gateway-gateway or a host-gateway, then which one of the following is true?

Question64: Original, unencrypted information is referred to as ____.

Question65: With Electronic codebook (ECB) what happens: