Chapter 3 Flashcards
Proving that a user sent an email message is known as .
Non-repudiation
Repudiation
Integrity
Availability
Non-repudiation
A(n) is not decrypted but is only used for comparison purposes.
Key
Stream
Digest
Algorithm
Digest
Which of these is NOT a characteristic of a secure hash algorithm?
Collisions should be rare.
A message cannot be produced from a predefined hash.
The results of a hash function should not be reversed.
The hash should always be the same fixed size.
Collisions should be rare.
Alyosha was explaining to a friend the importance of protecting a cryptographic key from cryptoanalysis. He said that the key should not relate in a simple way to the cipher text. Which protection is Alyosha describing?
Diffusion
Confusion
Integrity
Chaos
Confusion
Which of these is the strongest symmetric cryptographic algorithm?
Data Encryption Standard
Triple Data Encryption Standard
Advanced Encryption Standard
RC 1
Advanced Encryption Standard (AES)
If Bob wants to send a secure message to Alice using an asymmetric cryptographic algorithm, which key does he use to encrypt the message?
Alice’s private key
Bob’s public key
Alice’s public key
Bob’s private key
Alice’s public key
Egor wanted to use a digital signature. Which of the following benefits will the digital signature not provide?
Verify the sender
Prove the integrity of the message
Verify the receiver
Enforce nonrepudiation
Verify the receiver
Illya was asked to recommend the most secure asymmetric cryptographic algorithm to his supervisor. Which of the following did he choose?
SHA-2
ME-312
BTC-2
RSA
RSA
At a staff meeting one of the technicians suggested that the enterprise protect its new web server by hiding it and not telling anyone where it is located. Iosif raised his hand and said that security through obscurity was a poor idea. Why did he say that?
It is an unproven approach and has never been tested.
It would be too costly to have one isolated server by itself.
It would be essentially impossible to keep its location a secret from everyone.
It depends too heavily upon non-repudiation in order for it to succeed.
It would be essentially impossible to keep its location a secret from everyone.
What is a characteristic of the Trusted Platform Module (TPM)?
It provides cryptographic services in hardware instead of software.
It allows the user to boot a corrupted disk and repair it.
It is available only on Windows computers running BitLocker.
It includes a pseudorandom number generator (PRNG).
It provides cryptographic services in hardware instead of software.
Which of these has an onboard key generator and key storage facility, as well as accelerated symmetric and asymmetric encryption, and can back up sensitive material in encrypted form?
Trusted Platform Module (TPM)
Hardware Security Module (HSM)
Self-encrypting hard disk drives (SED)
Encrypted hardware-based USB devices
Hardware Security Module (HSM)
The Hashed Message Authentication Code (HMAC) .
encrypts only the message
encrypts only the key
encrypts the key and the message
encrypts the DHE key only
encrypts the key and the message
What is the latest version of the Secure Hash Algorithm?
SHA-2
SHA-3
SHA-4
SHA-5
SHA-3
Alexei was given a key to a substitution cipher. The key showed that the entire alphabet was rotated 13 steps. What type of cipher is this?
AES
XAND13
ROT13
Alphabetic
ROT13
Abram was asked to explain to one of his coworkers the XOR cipher. He showed his coworker an example of adding two bits, 1 and 1. What is the result of this sum?
2
1
0
16
0
