IBPS IT SO- Computer Networks-Cryptography

Cryptography

1. In cryptography, what is cipher?
a) algorithm for performing encryption and decryption
b) encrypted message
c) both (a) and (b)
d) none of the mentioned

Answer:a
Explanation:None.

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:b
Explanation:None.

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 the mentioned

Answer:c
Explanation:None.

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 the mentioned

Answer:a
Explanation:None.

5. What is data encryption standard (DES)?
a) block cipher
b) stream cipher
c) bit cipher
d) none of the mentioned

Answer:a
Explanation:None.

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 the mentioned

Answer:a
Explanation:None.

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:b
Explanation:None.

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:a
Explanation:None

9. ElGamal encryption system is
a) symmetric key encryption algorithm
b) asymmetric key encryption algorithm
c) not an encryption algorithm
d) none of the mentioned

Answer:b
Explanation:None.

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 the mentioned

Answer:a
Explanation:None.