5.3

Question 1

A __________ is an unauthorized listener(spy).

Answer 1

eavesdropper

Question 2

An _______ in the context of encyption, the mathematical formula used to scramble and unscramble data.

Answer 2

algorithm

Question 3

A ______ is a value that is used to encrypt or decrypt a message.

Answer 3

value

Question 4

T or F: A key can include numeric and alphanumeric text and special symbols.

Answer 4

true

Question 5

A ________ is restoring the original plain text from the cipher text.

Answer 5

decryption

Question 6

_________ is the process of converting plain text to cipher text.

Answer 6

encyption

Question 7

_______ is the process of coding information into a form that is unreadable.

Answer 7

encryption

Question 8

________ is an algorithm for transforming plain text to cipher text.

Answer 8

cipher

Question 9

________ is the coded message (or) a non-readable form of the original text.

Answer 9

cipher text

Question 10

_______ is the original message (or) an original readable textual material message or data.

Answer 10

plain text

Question 11

___________ is the study of methods used to transmit information securely between two or more participants, so that it is unreadable by unauthorized users.

Answer 11

cryptography

Question 12

T or F: Cryptography is an essential tool to achieve the basic goals of Information Security.

Answer 12

true

Question 13

_________ is the science of breaking cipher texts without the knowledge of the key.

Answer 13

cryptanalysis

Question 14

cryptography and cryptanalysis are known as _________.

Answer 14

cryptology

Question 15

Encryption and decryption, Hash functions, Digital Signatures, and Digital Certificates (digital IDs) are some of the popular _____________.

Answer 15

cryptographic mechanisms

Question 16

T or F: The conversion and subsequent recovery of the data depend on a code or a key, which can be a number or a string of characters.

Answer 16

true

Question 17

Encryption is a cryptographic mechanism that helps to achieve the security service __________, whether the information is in storage or in transit.

Answer 17

confidentiality

Question 18

T or F: The fundemental requirement of Encryption is that no information is lost (all operation are reversible).

Answer 18

true

Question 19

What are two basic techniques for encryption?

Answer 19

substitution ciphers, and transposition ciphers.

Question 20

In ________ ciphers, each element in the plain text (bit, letter, group of bits or letters) is mapped into another element.

Answer 20

subsitution

Question 21

In ________ ciphers, elements in the plain text are rearranged or plain text characters are shifted in some regular pattern to form cipher text.

Answer 21

transposition

Question 22

the security of the data is totally dependent on two things: the strength of the _________ and the secrecy of the ______.

Answer 22

cryptographic algorithms, key.

Question 23

What are the two types of cryptograhic algorithms?

Answer 23

Asymmetric cryptography, and Symmetric cryptography.

Question 24

In __________ algothrithms, we use the same key to encrypt and decrypt the data.

Answer 24

Symmetric

Question 25

T or F: In symmetric algorithms, the sender and receiver must have the same key in order to share confidential information.

Answer 25

true

Question 26

What are the two challenges(problems) that come with a symmetric key cryptography?

Answer 26

distribution of key, authenticity.

Question 27

In _______ cryptography, two different keys are used for encryption and decryption of data.

Answer 27

asymmetric key

Question 28

What are the two keys used in asymmetric cryptography?

Answer 28

there is a public key and a private key.

Question 29

asymmetric key cryptography is also known as ________.

Answer 29

public key cryptography.

Question 30

In Asymmetric Key Cryptography, the ______ key is used to decrypt the data.

Answer 30

private

Question 31

T or F: In asymmetric cryptography, the private key is kep secret at all times, but the public key may be freely distributed.

Answer 31

true