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ECCouncil 212-81 Practice Test - Questions Answers, Page 13

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Question 121

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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.

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Question 122

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Which of the following uses an 80 bit key on 64 bit blocks?

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Question 123

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Frank is trying to break into an encrypted file... He is attempting all the possible keys that could be used for this algorithm. Attempting to crack encryption by simply trying as many randomly generated keys as possible is referred to as what?

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Question 124

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With Cipher-block chaining (CBC) what happens?

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Question 125

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Algorithm that was chosen for the Data Encryption Standard, which was altered and renamed Data Encryption Algorithm.

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Question 126

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Which of the following equations is related to EC?

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Question 127

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

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Question 128

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A simple algorithm that will take the initial key and from that generate a slightly different key each round.

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Question 129

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Juanita is attempting to hide some text into a jpeg file. Hiding messages inside another medium is referred to as which one of the following?

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Question 130

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If you use substitution alone, what weakness is present in the resulting cipher text?

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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?