QUESTION 1 A ciphertext only attack is not difficult because the cryptanalyst ha

Question

QUESTION 1

A ciphertext only attack is not difficult because the cryptanalyst has samples of the encrypted text.

True

False

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QUESTION 2

Brute force attacks are also known as heuristics.

True

False

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QUESTION 3

Frequency attacks is a statistical method that relies on the predictable patterns in a given language.

True

False

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QUESTION 4

In a Known Plaintext Attack, the attacker posseses which of the following

plaintext

ciphertext

algorithm

Both plaintext and ciphertext

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QUESTION 5

Moore's Law is a factor in brute force attacks

True

False

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QUESTION 6

The number of keys in the key space is a factor in the how hard a cryptographic algorithm is to break using a brute force algorithm.

True

False

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QUESTION 7

Which of the following is not an attack against people?

Social engineering

Purchase key attack

Rubber hose attack

Birthday attack

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QUESTION 8

Which type of attack is typically used against password files or hashed values?

Frequency Analysis

Timing Attacks

Power analysis attacks

Dictionary attacks

plaintext

ciphertext

algorithm

Both plaintext and ciphertext

Explanation / Answer

1. False.

Reason:- A ciphertext-only attack is one of the most difficult attacks in Cryptography because the attacker has only access to ciphertext space and he has little knowledge of the encryption algorithm used. Usually, the success of a ciphertext-only attack is very low.

2.

False.

Reason:- Brute force attack is also known as an exhaustive key searching attack. In this attack model, the attacker tries all possible key to decrypt a given cyphertexts. Where the heuristics attacks are developed to reduce the search space to a practical size.

3. True.

4. In a Known Plaintext Attack, the attacker possesses which of the following:-

Correct Answer:- Both plaintext and ciphertext.

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