Nonrepudiation and Availability Services Quiz

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What does nonrepudiation prevent?

Receiver from denying a transmitted message

Receiver from acknowledging a transmitted message

Sender from acknowledging a transmitted message

Sender from denying a transmitted message (correct)

Which type of cryptographic mechanism allows data to be encrypted and decrypted?

Irreversible cryptographic mechanisms

Digital signatures

Reversible cryptographic mechanisms (correct)

Cryptographic hash functions

What is the purpose of message authentication codes in digital signature applications?

To ensure non-repudiation of messages

To verify the integrity of messages (correct)

To provide confidentiality to messages

To prevent availability issues

In the context of cryptographic algorithms, what do irreversible cryptographic mechanisms include?

Hash algorithms and message authentication codes (A) Signup and view all the answers

What is the primary function of a digital signature?

To verify the integrity of messages (C) Signup and view all the answers

What role does access control service play in ensuring the availability of a system?

Protecting against denial-of-service attacks (C) Signup and view all the answers

What is the primary purpose of a cryptographic hash function?

To turn a variable amount of text into a small, fixed-length value (D) Signup and view all the answers

What is the key characteristic that distinguishes a cryptographic hash function from a regular hash function?

Additional properties that make it useful for other cryptographic algorithms (D) Signup and view all the answers

How do symmetric encryption algorithms differ from keyless algorithms like hash functions?

Symmetric encryption requires a secret key, while hash functions do not (A) Signup and view all the answers

What is the primary purpose of a digital signature?

To authenticate the origin and integrity of a message (B) Signup and view all the answers

How do symmetric encryption algorithms use a secret key differently than digital signatures?

Symmetric encryption requires the same secret key for both the sender and receiver, while digital signatures use a public/private key pair (B) Signup and view all the answers

How do cryptographic hash functions differ from pseudorandom number generators (PRNGs)?

Hash functions produce a fixed-length output, while PRNGs produce a variable-length output (C) Signup and view all the answers

What is the purpose of a message authentication code (MAC)?

To verify the integrity of the message (A) Signup and view all the answers

How does a block cipher operate on data?

As a sequence of blocks (C) Signup and view all the answers

Which component is typically involved in the generation of a MAC?

A cryptographic hash function (C) Signup and view all the answers

What distinguishes a stream cipher from a block cipher?

A stream cipher operates on data as a sequence of bits (A) Signup and view all the answers

What is a key factor that determines the transformation performed by a block cipher?

The secret key (D) Signup and view all the answers

What is the primary purpose of using a digital signature?

To authenticate the sender of the message (C) Signup and view all the answers