Deck 1: Cryptography and Network Security

Question 1

In symmetric-key cryptography, the key locks and unlocks the box is

A)same
B)shared
C)private
D)public

Answer 1

same

Question 2

The keys used in cryptography are

A)secret key
B)private key
C)public key
D)all of them

Answer 2

all of them

Question 3

Cryptography, a word with Greek origins, means

A)corrupting data
B)secret writing
C)open writing
D)closed writing

Answer 3

secret writing

Question 4

A transposition cipher reorders (permutes) symbols in a

A)block of packets
B)block of slots
C)block of signals
D)block of symbols

Question 5

Network Security provides authentication and access control for resources.

Question 6

Which is not an objective of network security?

A)identification
B)authentication
C)access control
D)lock

Question 7

The process of verifying the identity of a user.

A)authentication
B)identification
C)validation
D)verification

Question 8

Which of these is a part of network identification?

A)user id
B)password
C)otp
D)fingerprint

Question 9

An algorithm used in encryption is referred to as cipher.

Question 10

A process of making the encrypted text readable again.

A)decryption
B)encryption
C)network security
D)information hiding

Question 11

A person who enjoys learning details about computers and how to enhance their capabilities.

A)cracker
B)hacker
C)app controller
D)site controller

Question 12

A small program that changes the way a computer operates.

A)worm
B)trojan
C)bomb
D)virus

Question 13

An asymmetric-key (or public-key) cipher uses

A)1 key
B)2 key
C)3 key
D)4 key

Question 14

We use cryptofraphy term to transform messages to make them secure and immune to

A)change
B)idle
C)attacks
D)defend

Question 15

In cryptography , the original message before being transformmed , is called

A)simple text
B)plain text
C)empty text
D)filled text

Question 16

A straight permutation cipher or a straight p-box has the same number of input as

A)cipher
B)frames
C)outputs
D)bits

Question 17

The man-in-the-middle attack can endanger the security of the diffie-hellman if two parties are not

A)authenticated
B)joined
C)submit
D)separate

Question 18

Which of the following is not a transport layer vulnerability?

A)mishandling of undefined , poorly defined
B)the vulnerability that allows fingerprinting & other enumeration of host information
C)overloading of transporting layer mechanisms
D)unauthorized network access

Question 19

Transmission mechanisms can be subject to spoofing & attacks based on skilled modified packets.

Question 20

TCP/IP model does not have_______layer but OSI model have this layer.

A)session layer
B)transport layer
C)application layer
D)network layer

Question 21

In cryptography, what is cipher?

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

Question 22

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

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

Question 23

What is data encryption standard (DES)?

A)block cipher
B)stream cipher
C)bit cipher
D)byte cipher

Question 24

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