Certified Encryption Specialist (212-81) Free Practice Test

Question 1

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?

A. 56

B. 256

C. 128

D. 64

Correct Answer: A

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Question 2

A protocol for key aggreement based on Diffie-Hellman. Created in 1995. Incorporated into the public key standard IEEE P1363.

A. Menezes-Qu-Vanstone

B. Blum Blum Shub

C. Euler's totient

D. Elliptic Curve

Correct Answer: A

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Question 3

What is Kerchoff's principle?

A. Both algorithm and key should be kept secret

B. A minimum key size of 256 bits is necessary for security

C. A minimum of 15 rounds is needed for a Feistel cipher to be secure

D. Only the key needs to be secret, not the actual algorithm

Correct Answer: D

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Question 4

Which one of the following is a component of the PKI?

A. TGT

B. OCSP

C. TGS

D. CA

Correct Answer: D

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Question 5

A part of understanding symmetric cryptography understands the modes in which it can be used. You are explaining those modes to a group of cryptography students. The most basic encryption mode is____________.
The message is divided into blocks, and each block is encrypted separately with no modification to the process.

A. Electronic codebook (ECB)

B. Cipher block chaining (CBC)

C. Output feedback (OFB)

D. Cipher feedback (CFB)

Correct Answer: A

Question 6

What is a variation of DES that uses a technique called Key Whitening?

A. Blowfish

B. 3DES

C. AES

D. DESX

Correct Answer: D

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Question 7

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

A. PGP

B. RSA

C. DES

D. DSA

Correct Answer: C

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Question 8

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

A. 256

B. 128

C. 512

D. 160

Correct Answer: B

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Question 9

The greatest weakness with symmetric algorithms is _____.

A. They are less secure than asymmetric

B. The problem of generating keys

C. The problem of key exchange

D. They are slower than asymmetric

Correct Answer: C

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EC-COUNCIL Certified Encryption Specialist (212-81) Free Practice Test