212-81 by EC-COUNCIL Actual Free Exam Q&As

Question 1

What size block does AES work on?

A. 256 B. 64 C. 192 D. 128

Discussion 0

Correct Answer: D Vote an answer

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Question 2

Which of the following is an asymmetric algorithm that was first publically described in 1977?

A. DESX B. Elliptic Curve C. Twofish D. RSA

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Correct Answer: D Vote an answer

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Question 3

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.

A. DESX B. FISH C. Twofish D. IDEA

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Correct Answer: B Vote an answer

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Question 4

With Electronic codebook (ECB) what happens:

A. The cipher text from the current round is XORed with the plaintext from the previous round B. The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption C. The block cipher is turned into a stream cipher D. The cipher text from the current round is XORed with the plaintext for the next round

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Correct Answer: B Vote an answer

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Question 5

A technique used to increase the security of block ciphers. It consists of steps that combine the data with portions of the key (most commonly using a simple XOR) before the first round and after the last round of encryption.

A. Key Schedule B. Key Exchange C. Whitening D. Key Clustering

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Correct Answer: C Vote an answer

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Question 6

Jane is looking for an algorithm to ensure message integrity. Which of following would be an acceptable choice?

A. SHA-1 B. RC4 C. RSA D. AES

Discussion 0

Correct Answer: A Vote an answer

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Question 7

Numbers that have no factors in common with another.

A. Mersenne Primes B. Even Numbers C. Co-prime numbers D. Fibonacci Numbers

Discussion 0

Correct Answer: C Vote an answer

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Question 8

DES has a key space of what?

A. 2^64 B. 2^128 C. 2^192 D. 2^56

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Correct Answer: D Vote an answer

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Question 9

A _____ is a function is not reversible.

A. Stream cipher B. Hash C. Asymmetric cipher D. Block Cipher

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Correct Answer: B Vote an answer

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Question 10

How can rainbow tables be defeated?

A. Password salting B. Use of non-dictionary words C. Lockout accounts under brute force password cracking attempts D. All uppercase character passwords

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Correct Answer: A Vote an answer

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EC-COUNCIL Certified Encryption Specialist - 212-81 Exam Practice Test