18 Questions
What does nonrepudiation prevent?
Sender from denying a transmitted message
Which type of cryptographic mechanism allows data to be encrypted and decrypted?
Reversible cryptographic mechanisms
What is the purpose of message authentication codes in digital signature applications?
To verify the integrity of messages
In the context of cryptographic algorithms, what do irreversible cryptographic mechanisms include?
Hash algorithms and message authentication codes
What is the primary function of a digital signature?
To verify the integrity of messages
What role does access control service play in ensuring the availability of a system?
Protecting against denial-of-service attacks
What is the primary purpose of a cryptographic hash function?
To turn a variable amount of text into a small, fixed-length value
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
How do symmetric encryption algorithms differ from keyless algorithms like hash functions?
Symmetric encryption requires a secret key, while hash functions do not
What is the primary purpose of a digital signature?
To authenticate the origin and integrity of a message
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
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
What is the purpose of a message authentication code (MAC)?
To verify the integrity of the message
How does a block cipher operate on data?
As a sequence of blocks
Which component is typically involved in the generation of a MAC?
A cryptographic hash function
What distinguishes a stream cipher from a block cipher?
A stream cipher operates on data as a sequence of bits
What is a key factor that determines the transformation performed by a block cipher?
The secret key
What is the primary purpose of using a digital signature?
To authenticate the sender of the message
Test your knowledge on nonrepudiation and availability services in information security. Learn about how these services prevent denial of transmitted messages and ensure system availability.
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