Cyber Intelligence SECE47: Chapter 2

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Which type of encryption is commonly used for encrypting stored data on modern processors?

Symmetric encryption (correct)

Stream ciphers

Asymmetric encryption

Hash functions

What is a common approach to encrypt stored data for indefinite periods?

Random numbers

Symmetric block encryption algorithms

Back-end appliance (correct)

Use a commercially available encryption package

Which type of encryption algorithm is typically used for digital signatures and key management?

Symmetric block encryption algorithms

Stream ciphers

Public-key encryption (correct)

Hash functions

What type of function is used for message authentication without message encryption?

Secure hash functions Signup and view all the answers

Which of the following is a property of hash functions that makes them secure?

Collision resistance Signup and view all the answers

What does DES stand for in the context of encryption?

Data encryption standard Signup and view all the answers

What is a digital signature according to NIST FIPS PUB 186-4?

A data-dependent bit pattern that provides origin authentication, data integrity, and signatory nonrepudiation Signup and view all the answers

Which of the following is NOT one of the three digital signature algorithms specified in FIPS 186-4?

Diffie-Hellman Digital Signature Algorithm Signup and view all the answers

What type of transformation results in a digital signature?

Cryptography Signup and view all the answers

What is a key property required of random numbers for cryptographic applications?

Uniform distribution Signup and view all the answers

Which algorithm is used to generate a symmetric key for a temporary session key?

Diffie-Hellman Key Exchange Signup and view all the answers

What is the purpose of a digital envelope in cryptography?

To encrypt a message with a symmetric key Signup and view all the answers

Which property of random numbers ensures that no value in the sequence can be inferred from others?

Independence Signup and view all the answers

What distinguishes true random number generators (TRNG) from pseudorandom numbers?

They are unlikely to be predictable Signup and view all the answers

Which algorithmic technique is typically used for random number generation in cryptographic applications?

Deterministic algorithms Signup and view all the answers

What is the primary purpose of a digital signature verification algorithm?

To check the authenticity of a digital signature Signup and view all the answers

What is another name for symmetric encryption?

Single-key encryption Signup and view all the answers

What is the main advantage of Triple DES over regular DES?

Longer key length Signup and view all the answers

What is the primary goal of brute-force attacks on symmetric encryption?

Gain access to all future messages encrypted with that key Signup and view all the answers

Which encryption algorithm was selected as the Advanced Encryption Standard (AES) by NIST in 2001?

Rijndael Signup and view all the answers

What is the main drawback of the Electronic Codebook (ECB) mode of symmetric encryption?

Allows cryptanalysts to exploit regularities in the plaintext Signup and view all the answers

How does a Stream Cipher differ from a Block Cipher?

Processes continuously and produces output blocks for each input block Signup and view all the answers

What is the fundamental requirement for secure use of symmetric encryption?

Securely obtaining and keeping the secret key Signup and view all the answers

'Exploits the characteristics of the algorithm to attempt to deduce a specific plaintext or the key being used.' This statement refers to which type of attack?

'Cryptanalytic' attack Signup and view all the answers

What is one of the drawbacks associated with Triple DES (3DES)?

Algorithm is slow in hardware Signup and view all the answers

Why is combining authentication and confidentiality preferable in message encryption?

Ensures message authenticity and confidentiality Signup and view all the answers

Cyber Intelligence SECE47: Chapter 2 - Symmetric Encryption

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