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ECCouncil 212-81 Practice Test - Questions Answers, Page 15

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Question 141

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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

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Question 142

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WPA2 uses AES for wireless data encryption at which of the following encryption levels?

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Question 143

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This hash function uses 512-bit blocks and implements preset constants that change after each repetition. Each block is hashed into a 256-bit block through four branches that divides each 512 block into sixteen 32-bit words that are further encrypted and rearranged.

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Question 144

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Which component of IPsec performs protocol-level functions that are required to encrypt and decrypt the packets?

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Question 145

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Basic information theory is the basis for modern symmetric ciphers. Understanding the terminology of information theory is, therefore, important. Changes to one character in the plaintext affect multiple characters in the ciphertext. What is this referred to?

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Question 146

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In steganography, ________ is the data to be covertly communicated (in other words, it is the message you wish to hide).

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Question 147

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

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Question 148

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Which algorithm was U. S. Patent 5,231,668, filed on july 26, 1991, attributed to David W. Kravitz, and adopted by the U. S. government in 1993 with FIPS 186?

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Question 149

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

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Question 150

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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?

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Message hidden in unrelated text. Sender and receiver have pre-arranged to use a pattern to remove certain letters from the message which leaves only the true message behind.
Ahlen is using a set of pre-calculated hashes to attempt to derive the passwords from a Windows SAM file. What is a set of pre-calculated hashes used to derive a hashed password called?
The most common way steganography is accomplished is via which one of the following?
Represents the total number of possible values of keys in a cryptographic algorithm or other security measure, such as a password.
With Cipher-block chaining (CBC) what happens?
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?
Nicholas is working at a bank in Germany. He is looking at German standards for pseudo random number generators. He wants a good PRNG for generating symmetric keys. The German Federal Office for Information Security (BSI) has established four criteria for quality of random number generators. Which ones can be used for cryptography?
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?
John is going to use RSA to encrypt a message to Joan. What key should he use?
3DES can best be classified as which one of the following?