Cryptography - Computer Networks Questions and Answers
1.
In cryptography, what is cipher?
A.)
algorithm for performing encryption and decryption
B.)
encrypted message
C.)
both (a) and (b)
D.)
none of these
Answer: Option 'A'
algorithm for performing encryption and decryption
2.
In asymmetric key cryptography, the private key is kept by
A.)
sender
B.)
receiver
C.)
sender and receiver
D.)
all the connected devices to the network
Answer: Option 'B'
receiver
3.
Which one of the following algorithm is not used in asymmetric-key cryptography?
A.)
RSA algorithm
B.)
diffie-hellman algorithm
C.)
electronic code book algorithm
D.)
none of these
Answer: Option 'C'
electronic code book algorithm
4.
In cryptography, the order of the letters in a message is rearranged by
A.)
transpositional ciphers
B.)
substitution ciphers
C.)
both (a) and (b)
D.)
none of these
Answer: Option 'A'
transpositional ciphers
5.
What is data encryption standard (DES)?
A.)
block cipher
B.)
stream cipher
C.)
bit cipher
D.)
none of these
Answer: Option 'A'
block cipher
6.
Cryptanalysis is used
A.)
to find some insecurity in a cryptographic scheme
B.)
to increase the speed
C.)
to encrypt the data
D.)
none of these
Answer: Option 'A'
to find some insecurity in a cryptographic scheme
7.
Which one of the following is a cryptographic protocol used to secure HTTP connection?
A.)
stream control transmission protocol (SCTP)
B.)
transport layer security (TSL)
C.)
explicit congestion notification (ECN)
D.)
resource reservation protocol
Answer: Option 'B'
transport layer security (TSL)
8.
Voice privacy in GSM cellular telephone protocol is provided by
A.)
A5/2 cipher
B.)
b5/4 cipher
C.)
b5/6 cipher
D.)
b5/8 cipher
Answer: Option 'A'
A5/2 cipher
9.
ElGamal encryption system is
A.)
symmetric key encryption algorithm
B.)
asymmetric key encryption algorithm
C.)
not an encryption algorithm
D.)
none of these
Answer: Option 'B'
asymmetric key encryption algorithm
- Basics Computer Networks Question and Answers
- Reference Models
- Physical Layer
- Data Link Layer
- Network Layer
- Transport Layer
- Application Layer
- DNS
- Telnet
- World Wide Web
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- Wireless LAN
- WiMAX
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- Topology
- Packet Switching & Circuit Switching
- SONET
- Internet
- Cryptography
- Security In The Internet
- Delays and Loss
- Network Attacks
- DHCP
- SMTP
- FTP
10.
Cryptographic hash function takes an arbitrary block of data and returns
A.)
fixed-size bit string
B.)
variable size bit string
C.)
both (a) and (b)
D.)
none of these
Answer: Option 'A'
fixed-size bit string
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