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CS_InfSec

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Quiz on CS_InfSec, created by Dina Kim on 26/03/2019.
Dina Kim
Quiz by Dina Kim, updated more than 1 year ago
Dina Kim
Created by Dina Kim over 5 years ago
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Resource summary

Question 1

Question
Which of the following is not a fundamental security goal?
Answer
  • assurance
  • confidentiality
  • all of the statements are correct
  • integrity
  • availability

Question 2

Question
A computer program that appears to have a useful function, but also has a hidden and potentially malicious function that evades security mechanisms, sometimes by exploiting legitimate authorizations of a system entity that invokes the program.
Answer
  • Trojan Horse
  • Virus
  • Logic Bomb
  • OPSEC
  • Worm

Question 3

Question
A(n) ____ is one that encrypts a digital data stream one bit or one byte at a time
Answer
  • stream cipher
  • symmetric cipher
  • none of the statements
  • asymmetric cipher
  • block cipher

Question 4

Question
A pair of keys that have been selected so that if one is used for encryption the other is used for decryption in public key cryptosystem
Answer
  • public and private keys
  • public and cipher keys
  • encryption and decryption keys
  • none of the statements
  • plain and cipher keys

Question 5

Question
Free from mistake or error and having the value that the end-user expects
Answer
  • Accuracy
  • Authenticity
  • Confidentiality
  • Availability
  • Authentication

Question 6

Question
Which of these is possibly the worst password that user can choose
Answer
  • Nursulatan1612
  • k@zaKh
  • a$tana8567
  • aLm4tyc?TY
  • none of the statements

Question 7

Question
What is plaintext?
Answer
  • the original intelligible message or data that is fed into the algorithm as input
  • the original intelligible message or data that is produced as output
  • none of the statements
  • the scrambled message produced as output
  • the scrambled message or data that is fed into the algorithm as output

Question 8

Question
Which of the following statement is not true?
Answer
  • The public key is kept secret while the private key may be widely distributed
  • Asymmetric cryptography is a form of cryptography in which a user has a pair of cryptographic keys
  • The public key and private key are mathematically related
  • The private key cannot be practically derived from the public
  • Asymmetric cryptography is also known as public key cryptography

Question 9

Question
A function that is easily computed and the calculation of its inverse is infeasible unless certain privileged information is known
Answer
  • Trapdoor one-way function
  • Virus
  • Logical Bomb
  • Trojan Horse
  • Worm

Question 10

Question
What is encryption algorithm
Answer
  • performs various substitutions and transformations on the plaintext
  • it takes the ciphertext and the secret key and produces the original plaintext
  • the scrambled message produced as output
  • performs various substitutions and transformations on the ciphertext
  • random stream of data and, as it stands, is unintelligible

Question 11

Question
Which of the statement is property for p and q
Answer
  • p and q are prime
  • p is greater than q
  • p and q should be of similar bit length
  • p and q are distinct
  • p - q -1

Question 12

Question
DMZ what is one advantage of setting up a DMZ with two firewalls
Answer
  • you can control where traffic goes in the three networks
  • you can do stateful packet filtering
  • you can do load balancing
  • improved network performance
  • all of the statements

Question 13

Question
Program that can replicate itself and send copies from computer to computer across network connections. usually performs some unwanted function
Answer
  • worm
  • trojan house
  • virus
  • logical bomb
  • opsec

Question 14

Question
In a public key system using rsa you intercept the ciphertext C = 10 sent to user whose public key is e = 5; n = 35. What is the value of p and q?
Answer
  • p = 5, q = 7
  • p = 1, q = 35
  • p = q = e =5
  • p = 6, q = 8
  • p = q = n = 35

Question 15

Question
Encrypt the message WELCOME! Using Caesar cipher with the key = 34’ [blank_start]Answer[blank_end]
Answer
  • emtkwum!

Question 16

Question
Which of the following is form of malware
Answer
  • all of the statements are correct
  • rootkits
  • viruses
  • worms
  • scripts

Question 17

Question
Which of the following is not true?
Answer
  • A user must protect his/her public key
  • A user does not have to protect his/her public key
  • A user will have his/her own public key
  • A user will have his/her own private key
  • A user must remember his/her password that encrypts the public key

Question 18

Question
Which of these statements is true
Answer
  • In symmetric key cryptography the key that is used to encrypt data is the same key that is used to decrypt it
  • The encryption algorithm performs its steps using the key to alter the ciphertext and convert it to plaintext
  • The term "key" comes from the fact that the password you can choose works in the same way that a conventional key works
  • In cryptography, to protect the contents of your files, you can install a lock on your door
  • The decryption algorithm performs its steps using the key to alter the plaintext and convert it to ciphertext

Question 19

Question
The _________ is a number or a set of numbers on which the cipher operates
Answer
  • key
  • plaintext
  • cipher
  • secret
  • ciphertext

Question 20

Question
embedded in a computer program that checks for a certain set of conditions to be present on the system. When these conditions are met, it executes some function resulting in unauthorized actions
Answer
  • Logic bomb
  • Worm
  • OPSEC
  • Trojan House
  • Virus

Question 21

Question
The quality of state of having ownership or control of some object or item
Answer
  • possession
  • confidentiality
  • integrity
  • utility
  • authentication

Question 22

Question
Which one of the statement is a formula to find plain in RSA
Answer
  • M = c^d(mod n)
  • M = c^n(mod d)
  • M = c^e(mod n)
  • M = c^e(mod d)
  • M = c^n(mod e)

Question 23

Question
One objective of cryptography is property of being accessible and usable upon demand by an authorized entity
Answer
  • availability
  • denial of service
  • confidentiality
  • reliability
  • authentication

Question 24

Question
The vigenere cipher is which of the following types
Answer
  • polyalphabetic
  • monoalphabetic
  • none of the statements
  • asymmetric
  • diaplhabetic

Question 25

Question
The word asymmetric in public key cryptography means
Answer
  • The key to encrypt is different to the key to decrypt
  • The algorithm to encrypt is different from the algorithm to decrypt
  • None of the listed answers
  • The key to encrypt is the same with the key to decrypt
  • The algorithm to encrypt is the same with the algorithm to decrypt

Question 26

Question
A _________ cipher replaces one character with another character.
Answer
  • Substitution
  • Transposition
  • Reversing
  • Cultivation
  • Multiplication

Question 27

Question
Which one of the statement is a formula to find cipher in RSA
Answer
  • C =m^e(mod n)
  • C =m^n(mod d)
  • C =m^d(mod n)
  • C =m^n(mod e)
  • C =m^e(mod d)

Question 28

Question
In the rsa key the public key of a given user is e=31, n=3599. What is the value of p and q
Answer
  • P= 61, Q= 59
  • P= 1, Q= 3599
  • P= Q = N= 3599
  • P= Q= E = 31
  • P= 62, Q= 60

Question 29

Question
Find d using rsa algorithm, if p = 5, q= 11, e = 3; M = 9 [blank_start]Answer[blank_end]
Answer
  • 27

Question 30

Question
In a public – key system using rsa you intercept the ciphertext C = 10 sent to a user whose public key is e = 5 ; n = 35 what is the fi(n)? [blank_start]Answer[blank_end]
Answer
  • 24

Question 31

Question
Which of the following statement is properties of public key encryption
Answer
  • the sender and receiver must each have one of the matched pair of keys(not the same one)
  • one algorithm is used for encryption and decryption with a pair of keys, one for encryption and one for decryption
  • one of the two keys must be kept secret
  • the sender and receiver must share the algorithm and the key
  • the same algorithm with the same key is used for encryption and decryption

Question 32

Question
If a wrong key is entered to decrypt a message what will happen
Answer
  • The output will be gibberish
  • The output will not be visible
  • There is an error message
  • The cryptosystem will stop working
  • Nothing will happen

Question 33

Question
A ___ - level proxy inspects the entire packet and makes access decisions based on the contents of the packet
Answer
  • Application
  • Physical
  • Server
  • Proxy
  • Circuit

Question 34

Question
One objective of cryptography is keeping information secret from all but those who are authorised to see it. The term referring to this is:
Answer
  • Confidentiality
  • Secrecy
  • Witnessing
  • Authorisation
  • Anonymity

Question 35

Question
One of the keys used in an asymmetric encryption system. The public key is made public to be used in conjunction with a corresponding private key [blank_start]Answer[blank_end]
Answer
  • public key

Question 36

Question
A program that secretly takes over another internet attached computer and then uses that computer to lunch attacks that are difficult to trace to the creator
Answer
  • Zombie
  • Virus
  • Logical Bomb
  • OPSEC
  • Worm

Question 37

Question
According to DAD triad, _______ attempts to defeat availability
Answer
  • Destruction
  • Availability
  • Disclosure
  • Alteration
  • Confidentiality

Question 38

Question
The process of verifying and identify claimed by or for a system entity
Answer
  • Authentication
  • Timestamping
  • Confirmation
  • Processing
  • Validation

Question 39

Question
______ is a form of cryptosystem in which encryption and decryption are performed using two different keys one a public key and one a private key
Answer
  • Asymmetric encryption
  • Symmetric encryption
  • Synchronous encryption
  • None of the statements
  • Asynchronous encryption

Question 40

Question
One objective of cryptography is conveyance, to another entity, of official sanction to do or be something. The term referring to this is:
Answer
  • Authorisation
  • Entity authentication
  • Validation
  • Certificate
  • Confirmation

Question 41

Question
If the encrypted message is XBPG and deciphered text is QUIZ using the Caesar cipher, what is the value of key [blank_start]Answer[blank_end]
Answer
  • 7

Question 42

Question
A pair of key that have been selected so that if one is used for encryption, the other is used for decryption in Public-key cryptosystem
Answer
  • public and private keys
  • plain and cipher keys
  • none of the statements
  • public and cipher keys
  • encryption and decryption keys

Question 43

Question
Set of hacker tools after attacker has broken into a computer system and gained root-level access
Answer
  • rootkits
  • root-level hack
  • assets
  • zombie
  • virus

Question 44

Question
Which of the following statement is ingredients for a public key encryption scheme
Answer
  • all of the statements
  • encryption/decryption algorithm
  • plaintext
  • public/private keys
  • ciphertext

Question 45

Question
In a public-key system using RSA you intercept the ciphertext C = 10 sent to a user whose public key is e = 5; n = 35. What is the value of p and q?
Answer
  • P=5; q=7
  • P=6; q=8
  • P=q=e=5
  • P=1; q=35
  • p = q= n = 35

Question 46

Question
which of the following statement is not true
Answer
  • the public key can be used to derive the private key
  • the foundation of public-key algorithm is a one way function
  • all of the listed answers are true
  • the private key operates as a trap door that allows the owner to recover the original data
  • reversing the process of encryption is virtually impossible without the private key

Question 47

Question
Consists of a set of computers that interconnect by means of a relatively unsecure network and that make use of encryption and special protocols to provide security
Answer
  • virtual private network
  • demilitarized zone
  • anti-spoofing
  • firewalls
  • network address translation

Question 48

Question
you can use _________ to protect your computer from outsiders
Answer
  • antivirus software and personal firewall programs
  • system restore and antivirus software
  • personal firewall programs and system restore
  • antivirus software and the Recycle Bin
  • firewall programs and the Recycle Bin

Question 49

Question
One objective of cryptography is ensuring information has not been altered by unauthorised or unknown means. The term referring to this is:
Answer
  • data integrity
  • message authentication
  • confirmation
  • authorisation
  • validation

Question 50

Question
encrypt the message WELCOME! Using Caesar cipher with the key = 5 [blank_start]Answer[blank_end]
Answer
  • BJQHTRJ!

Question 51

Question
A form of cryptosystem in which encryption and decryption are performed using the same key. Also known as conventional encryption
Answer
  • Symmetric encryption
  • One key encryption
  • Private key encryption
  • Asymmetric encryption
  • Same key encryption

Question 52

Question
In a public key system using RSA you intercept the ciphertext C = 10 sent to user whose public key is e = 5; n =35. What will be the fi(n)? [blank_start]Answer[blank_end]
Answer
  • 24

Question 53

Question
A secret data value usually a character string that’s used as authentication information
Answer
  • password
  • secret key
  • key
  • OPSEC
  • DMZ

Question 54

Question
code embedded within a program that causes a copy of itself to be inserted in one of more other programs. Usually performs some unwanted function
Answer
  • virus
  • zombie
  • all of the statements
  • worm
  • firewall

Question 55

Question
In public-key system using rsa, you intercept the ciphertext C = 10 sent to a user whose public key is e = 5, n = 35. What is the plaintext M [blank_start]Answer[blank_end]
Answer
  • 5

Question 56

Question
Secret undocumented entry point into a program, used to grant access without normal methods of access authentication
Answer
  • Trapdoor
  • Virus
  • Trojan Horse
  • Logic Bomb
  • Worm

Question 57

Question
One objective of cryptography is identifying and acknowledging the identity of entity. The term referring to this is:
Answer
  • identification
  • message authentication
  • confirmation
  • validation
  • witnessing

Question 58

Question
Decipher the ciphertext QMHXIVQ using Caesar Cipher with the key = 4 [blank_start]Answer[blank_end]
Answer
  • midterm

Question 59

Question
Weakness of a system that could be accidentally or intentionally exploited to damage assets
Answer
  • Vulnerabilities
  • DMZ
  • Risk
  • Treats
  • Assets

Question 60

Question
Some _____ firewalls are able to examine the contents of packets as well as the headers for signs that they ate legitimate.
Answer
  • Stateful
  • Personal
  • Stateless
  • Boundary

Question 61

Question
provides a user with protection against discovery and misuse of his or her identity by other users
Answer
  • privacy
  • misuse
  • identification
  • ptotection
  • all of the statements

Question 62

Question
Use the playfair cipher with the keyword “PLAYFAIR” to encrypt the message “GOTO” [blank_start]Answer[blank_end]
Answer
  • OVNQ

Question 63

Question
In a public key system using rsa you intercept the ciphertext C = 10 sent to user whose public key is e = 5; n = 35. What is the value of d? [blank_start]Answer[blank_end]
Answer
  • 5

Question 64

Question
Base elements of information such as numbers, letters, symbols and so on which are processed or carried out by human (or by some machine)
Answer
  • Data
  • Context
  • Bytes
  • Information
  • Bits

Question 65

Question
What does firewall do
Answer
  • Protects your computer from internet intrusion
  • Restores lost data on your computer
  • Checks floppy or CDs for corrupted files
  • Scans for viruses on your system
  • Protects against power surges

Question 66

Question
Perform decryption using the rsa algorithm if p = 5; q = 11, e = 3; c =14 [blank_start]answer[blank_end]
Answer
  • 9

Question 67

Question
Which of the statement is true
Answer
  • The larger the key size the greater the range of possible values a key can be
  • The larger the key size the smaller the range of possible values a key can be
  • The larger the key size the range of possible values a key can be remains the same
  • The smaller the key size the greater the range of possible values a key can be
  • The smaller the key size the range of possible values a key can be remains the same

Question 68

Question
What of the following statements is true
Answer
  • Public key algorithms are slow compared to symmetric cryptography
  • None of the listed answers
  • Public key algorithms are used to hash the password
  • Public key algorithms are used to encrypt the message
  • Public key algorithms are used to encrypt the key encryption key

Question 69

Question
what is decryption algorithm
Answer
  • takes the ciphertext and the secret key and produces the original plaintext
  • none of the statements are true
  • the original intelligible message or data that is fed into the algorithm as input
  • the scrambled message produced as output
  • performs various substitutions and transformations on the plaintext

Question 70

Question
A stateful firewall maintains a ______ , which is a list of active connections
Answer
  • State table
  • Connection table
  • Hub table
  • Routing table
  • Bridging table

Question 71

Question
Possibility of an incident or attack to cause damage to your enterprise
Answer
  • Risk
  • Virus
  • Security
  • Assets
  • Malware

Question 72

Question
According to dad triad, _______ attempts to defeat confidentiality
Answer
  • disclosure
  • alteration
  • confidentiality
  • availability
  • destruction

Question 73

Question
Find d using rsa algorithm, if p = 3, q= 11, e = 7; M = 5 [blank_start]Answer[blank_end]
Answer
  • 3

Question 74

Question
According to dad triad, _______ attempts to defeat integrity
Answer
  • Alteration
  • Confidentiality
  • Availability
  • Destruction
  • Disclosure

Question 75

Question
One objective of cryptography is prevention of authorized access to resources or the delaying of time-critical operations
Answer
  • Denial of service
  • Confidentiality
  • Availability
  • Authentication
  • Reliability

Question 76

Question
A public key encryption algorithm based on exponentiation in modular arithmetic. It is the only algorithm generally accepted as practical and secure for public key encryption
Answer
  • RSA
  • Caesar cipher
  • Playfair Cipher
  • Vigenere Cipher
  • Hill Cipher

Question 77

Question
Which of the following statements are types of firewalls?
Answer
  • Application level gateways
  • Packet – filtering
  • Circuit-level gateways
  • Session-level gateways
  • Internet-level gateways

Question 78

Question
What will be the value of key in Caesar Cipher if initially key = 65 [blank_start]Answer[blank_end]
Answer
  • 13

Question 79

Question
The key used in a symmetric encryption system. Both participants must share the same key and this key must remain secret to protect communication
Answer
  • Secret key
  • Symmetric key
  • Public key
  • Private key
  • Asymmetric key

Question 80

Question
if you encrypt a ciphertext using right key, you will get
Answer
  • gibberish
  • ciphertext
  • plaintext
  • error message
  • key

Question 81

Question
Which one of the statement is equation for fi(n)?
Answer
  • Fi(n) = (p-1)(q-1)
  • Fi(n) = (p-1)(q)
  • Fi(n) = (p-q)(q-1)
  • Fi(n) = pq
  • Fi(n) = (p)(q-1)

Question 82

Question
Which of the following statement(s) is(are) the Security Principles
Answer
  • All of the statements
  • Separation of privileges
  • Least privilege
  • Defense in depth
  • Security through obscurity (the inadvisability thereof)

Question 83

Question
In a public key system using RSA you intercept the plaintext M=25 sent to user whose public key is e = 5; n =35. What will be the ciphertext C? [blank_start]Answer[blank_end]
Answer
  • 30

Question 84

Question
The Caesar cipher is a _______ cipher that has a key of 3
Answer
  • Shift
  • Transposition
  • Additive
  • Subtractive
  • Multiplicative

Question 85

Question
Secret undocumented entry point into a program, used to grant access without normal methods of access authentication
Answer
  • Trapdoor
  • Virus
  • Worm
  • Trojan Horse
  • Logic Bomb

Question 86

Question
One of the two keys used on an asymmetric encryption system. For secure communication, the private key should only be known to its creator [blank_start]Answer[blank_end]
Answer
  • private key

Question 87

Question
Which of these is not considered as a symmetric key algorithm
Answer
  • rsa
  • playfair cipher
  • hill cipher
  • caesar cipher
  • vigenere cipher

Question 88

Question
The quality of state of being genuine or original rather than a reproduction or fabrication
Answer
  • Authenticity
  • Availability
  • Authentication
  • Confidentiality
  • Accuracy

Question 89

Question
Perform encryption using the rsa algorithm if p = 3 q= 11 e = 7 M = 5 [blank_start]Answer[blank_end]
Answer
  • 14

Question 90

Question
A process of identifying, analysing and controlling critical information
Answer
  • OPSEC
  • Firewall
  • Scanning
  • DMZ
  • Anti-virus

Question 91

Question
____ is another term for a packet of digital information
Answer
  • datagram
  • data
  • bits
  • header
  • footer

Question 92

Question
________ is the science and art of transforming messages to make them secure and immune to attacks
Answer
  • Cryptography
  • Cryptosystem
  • None of the statements
  • Cryptoanalysis
  • Confidentiality

Question 93

Question
Which of the statement(s) is(are) properties for p an q
Answer
  • p an q are prime
  • p an q are distinct
  • p = q -1
  • p is greater than q
  • p and q should be of similar bit length

Question 94

Question
The translation of encrypted text or data (called ciphertext) into original text or data (called plaintext). Also called deciphering [blank_start]answer[blank_end]
Answer
  • decryption

Question 95

Question
Which of these is not considered as a symmetric key algorithm
Answer
  • RSA
  • Hill Cipher
  • Playfair Cipher
  • Caesar cipher
  • Vigenere Cipher

Question 96

Question
A combination of an encryption algorithm and decryption is called a _____
Answer
  • Cipher
  • Key
  • Polyalphabetic cipher
  • Secret
  • Substitution
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