1
PGP was developed by
Correct Answer
Phil Zimmermann
☑ MCQ PRACTICE
Cryptography and Network Security Unit 5
Practice objective questions for quick revision and examination preparation. Try answering each question before revealing the answer.
Cryptography and Network Security MCQs - Unit 5
2
PGP is mainly used to provide
Correct Answer
confidentiality and authentication for e-mail
3
In PGP, the session key used to encrypt a message is itself encrypted using
Correct Answer
the receiver's public key
4
The bulk of the message in PGP is encrypted using
Correct Answer
a symmetric cipher
5
PGP converts binary data to printable ASCII using
Correct Answer
radix-64 conversion
6
The trust model used by PGP is called the
Correct Answer
web of trust
7
S/MIME stands for
Correct Answer
Secure/Multipurpose Internet Mail Extensions
8
S/MIME uses which type of certificates?
Correct Answer
X.509
9
IPsec operates at the
Correct Answer
network layer
10
The two main protocols of IPsec are
Correct Answer
AH and ESP
11
The Authentication Header (AH) provides
Correct Answer
integrity and authentication but not confidentiality
12
The Encapsulating Security Payload (ESP) provides
Correct Answer
confidentiality and optionally authentication
13
IPsec can operate in which two modes?
Correct Answer
Transport mode and tunnel mode
14
Tunnel mode in IPsec protects
Correct Answer
the entire original IP packet
15
A Security Association (SA) in IPsec is
Correct Answer
a one-way relationship between sender and receiver
16
An SA is uniquely identified by the SPI, the destination IP address and
Correct Answer
the security protocol identifier (AH or ESP)
17
IKE stands for
Correct Answer
Internet Key Exchange
18
IKE uses which algorithm for key exchange?
Correct Answer
Diffie-Hellman
19
Two ways of combining security associations are
Correct Answer
transport adjacency and iterated tunneling
20
A VPN commonly uses IPsec in
Correct Answer
tunnel mode
21
Cross-site scripting (XSS) is
Correct Answer
injection of malicious scripts into trusted web pages
22
Single sign-on (SSO) allows a user to
Correct Answer
log in once and access multiple systems
23
Secure multiparty computation allows parties to
Correct Answer
jointly compute a function without revealing their private inputs
24
In a virtual (electronic) election, cryptography is used to ensure
Correct Answer
ballot secrecy and verifiable results
25
In secure inter-branch payment transactions, authenticity of a payment instruction is ensured using
Correct Answer
digital signatures
Fill in the Blanks
26
PGP stands for ______.
Correct Answer
Pretty Good Privacy
27
S/MIME stands for ______.
Correct Answer
Secure/Multipurpose Internet Mail Extensions
28
IPsec operates at the ______ layer.
Correct Answer
network
29
AH stands for ______.
Correct Answer
Authentication Header
30
ESP stands for ______.
Correct Answer
Encapsulating Security Payload
31
SA stands for ______.
Correct Answer
Security Association
32
SPI stands for ______.
Correct Answer
Security Parameters Index
33
IKE stands for ______.
Correct Answer
Internet Key Exchange
34
The trust model used by PGP, where users sign each other's keys, is called the ______.
Correct Answer
web of trust
35
In IPsec ______ mode, the entire original IP packet is encrypted and encapsulated in a new packet.
Correct Answer
tunnel
36
XSS stands for ______.
Correct Answer
Cross-Site Scripting
37
SSO stands for ______.
Correct Answer
Single Sign-On
38
In secure multiparty computation, parties compute a function without revealing their ______ inputs.
Correct Answer
private
39
PGP converts binary data to ASCII using ______ conversion.
Correct Answer
radix-64
40
Secure inter-branch payment transactions use ______ to ensure the authenticity of payment instructions.
Correct Answer
digital signatures