1
The message digest produced by SHA-512 is
Correct Answer
512 bits
☑ MCQ PRACTICE
Cryptography and Network Security Unit 3
Practice objective questions for quick revision and examination preparation. Try answering each question before revealing the answer.
Cryptography and Network Security MCQs - Unit 3
2
SHA-512 processes the message in blocks of
Correct Answer
1024 bits
3
The word size used in SHA-512 is
Correct Answer
64 bits
4
The number of rounds in SHA-512 is
Correct Answer
80
5
The property that makes it infeasible to find a message from its hash value is
Correct Answer
pre-image resistance (one-way property)
6
The digest size of MD5 is
Correct Answer
128 bits
7
The digest size of SHA-1 is
Correct Answer
160 bits
8
HMAC is built using
Correct Answer
a hash function and a secret key
9
CMAC is built using
Correct Answer
a block cipher
10
A message authentication code (MAC) provides
Correct Answer
authentication and integrity
11
A digital signature provides
Correct Answer
authentication, integrity and non-repudiation
12
A digital signature is created using the sender's
Correct Answer
private key
13
The ElGamal digital signature scheme is based on
Correct Answer
the discrete logarithm problem
14
Kerberos is an authentication service that uses
Correct Answer
tickets and symmetric key cryptography
15
The two main servers in a Kerberos realm are
Correct Answer
the Authentication Server (AS) and the Ticket Granting Server (TGS)
16
The X.509 standard defines the format of
Correct Answer
public key certificates
17
A Certificate Authority (CA)
Correct Answer
issues and signs digital certificates
18
A list of certificates that are no longer valid is called a
Correct Answer
Certificate Revocation List (CRL)
19
The birthday attack is related to
Correct Answer
finding collisions in hash functions
20
Which of the following is NOT a method of message authentication?
Correct Answer
Steganography
21
A session key is
Correct Answer
a temporary key used for a single session
22
Which of the following is NOT a way to distribute public keys?
Correct Answer
Private announcement
23
In HMAC, the outer padding constant opad is the byte
Correct Answer
0x5C repeated
24
In Kerberos, the Ticket Granting Ticket (TGT) is issued by
Correct Answer
the Authentication Server
25
The set of hardware, software, people and policies needed to manage digital certificates is called
Correct Answer
Public Key Infrastructure (PKI)
Fill in the Blanks
26
A hash function converts a variable-length message into a ______-length output.
Correct Answer
fixed
27
SHA-512 produces a message digest of ______ bits.
Correct Answer
512
28
The property that it is infeasible to find two different messages with the same hash is called ______ resistance.
Correct Answer
collision
29
HMAC stands for ______.
Correct Answer
Hash-based Message Authentication Code
30
CMAC stands for ______.
Correct Answer
Cipher-based Message Authentication Code
31
A digital signature is created with the sender's ______ key.
Correct Answer
private
32
A digital signature is verified with the sender's ______ key.
Correct Answer
public
33
In Kerberos, the Authentication Server issues a ______ to the client after login.
Correct Answer
Ticket Granting Ticket (TGT)
34
The X.509 standard defines the format of ______ certificates.
Correct Answer
public key
35
CA stands for ______.
Correct Answer
Certificate Authority
36
CRL stands for ______.
Correct Answer
Certificate Revocation List
37
In SHA-512, a ______-bit length field is appended during padding.
Correct Answer
128
38
The ______ attack on hash functions is based on the birthday paradox.
Correct Answer
birthday
39
The version of Kerberos that is widely used today is version ______.
Correct Answer
5
40
A MAC ensures message authentication and message ______.
Correct Answer
integrity