Deck 11: Cryptography and Cryptographic Protocols

Question 1

The procedure to add bits to the last block is termed as

A)decryption
B)hashing
C)tuning
D)padding

Answer 1

padding

Question 2

Cryptanalysis is used ______________      

A)to find some insecurity in a cryptographic scheme
B)to increase the speed
C)to encrypt the data
D)to make new ciphers

Answer 2

to find some insecurity in a cryptographic scheme

Question 3

Conventional cryptography is also known as or symmetric-key encryption.

A)secret-key
B)public key
C)protected key
D)primary key

Answer 3

secret-key

Question 4

__________________________________________is the art & science of cracking the cipher-text without knowing the key.

A)cracking
B)cryptanalysis
C)cryptography
D)crypto-hacking

Question 5

In cryptography, what is cipher?

A)algorithm for performing encryption and decryption
B)encrypted message
C)both algorithm for performing encryption and decryption and encrypted message
D)decrypted message

Question 6

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

Question 7

In cryptography, the order of the letters in a message is rearranged by __________

A)transpositional ciphers
B)substitution ciphers
C)both transpositional ciphers and substitution ciphers
D)quadratic ciphers

Question 8

Cryptanalysis is used __________

A)to find some insecurity in a cryptographic scheme
B)to increase the speed
C)to encrypt the data
D)to make new ciphers

Question 9

Which one of the following is a cryptographic protocol used to secure HTTP connection?

A)stream control transmission protocol (sctp)
B)transport layer security (tls)
C)explicit congestion notification (ecn)
D)resource reservation protocol

Question 10

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

Question 11

ElGamal encryption system is __________

A)symmetric key encryption algorithm
B)asymmetric key encryption algorithm
C)not an encryption algorithm
D)block cipher method

Question 12

Cryptographic hash function takes an arbitrary block of data and returns _________

A)fixed size bit string
B)variable size bit string
C)both fixed size bit string and variable size bit string
D)variable sized byte string

Question 13

In terms of Web Security Threats, "Impersonation of another user" is a Passive Attack.

Question 14

Which one of the following is not a higher -layer SSL protocol?

A)alert protocol
B)handshake protocol
C)alarm protocol
D)change cipher spec protocol

Question 15

In the SSL Protocol, each upper layer message if fragmented into a maximum of __________ bytes.

A)216
B)232
C)214
D)212

Question 16

The full form of SSL is

A)serial session layer
B)secure socket layer
C)session secure layer
D)series socket layer

Question 17

Which protocol is used to convey SSL related alerts to the peer entity?

A)alert protocol
B)handshake protocol
C)upper-layer protocol
D)change cipher spec protocol

Question 18

Which protocol consists of only 1 bit?

A)alert protocol
B)handshake protocol
C)upper-layer protocol
D)change cipher spec protocol

Question 19

Which protocol is used for the purpose of copying the pending state into the current state?

A)alert protocol
B)handshake protocol
C)upper-layer protocol
D)change cipher spec protocol

Question 20

In the alert protocol the first byte takes the value 1 or 2 which corresponds to _________ and _________ respectively.

A)select, alarm
B)alert, alarm
C)warning, alarm
D)warning, fatal

Question 21

Pretty good privacy (PGP) security system uses

A)public key cryptosystem
B)private key cryptosystem
C)public & private key cryptosystem
D)none of the mentioned

Question 22

Data compression includes

A)removal of redundant character
B)uniform distribution of characters
C)removal of redundant character & uniform distribution of characters
D)none of the mentioned

Question 23

PGP offers _____ block ciphers for message encryption.

A)triple-des
B)cast
C)idea
D)all of the mentioned