Cryptography - Computer Networks Questions and Answers

1.

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

2.

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

3.

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)

4.

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

5.

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

6.

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

7.

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

8.

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

9.

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

10.

What is data encryption standard (DES)?

   A.) block cipher
   B.) stream cipher
   C.) bit cipher
   D.) none of these

Answer: Option 'A'

block cipher


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