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CS_InfSec

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Quiz sobre CS_InfSec, criado por Dina Kim em 26-03-2019.
Dina Kim
Quiz por Dina Kim, atualizado more than 1 year ago
Dina Kim
Criado por Dina Kim mais de 5 anos atrás
158
5
0

Resumo de Recurso

Questão 1

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

Questão 2

Questão
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.
Responda
  • Trojan Horse
  • Virus
  • Logic Bomb
  • OPSEC
  • Worm

Questão 3

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

Questão 4

Questão
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
Responda
  • public and private keys
  • public and cipher keys
  • encryption and decryption keys
  • none of the statements
  • plain and cipher keys

Questão 5

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

Questão 6

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

Questão 7

Questão
What is plaintext?
Responda
  • 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

Questão 8

Questão
Which of the following statement is not true?
Responda
  • 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

Questão 9

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

Questão 10

Questão
What is encryption algorithm
Responda
  • 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

Questão 11

Questão
Which of the statement is property for p and q
Responda
  • 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

Questão 12

Questão
DMZ what is one advantage of setting up a DMZ with two firewalls
Responda
  • 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

Questão 13

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

Questão 14

Questão
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?
Responda
  • p = 5, q = 7
  • p = 1, q = 35
  • p = q = e =5
  • p = 6, q = 8
  • p = q = n = 35

Questão 15

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

Questão 16

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

Questão 17

Questão
Which of the following is not true?
Responda
  • 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

Questão 18

Questão
Which of these statements is true
Responda
  • 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

Questão 19

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

Questão 20

Questão
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
Responda
  • Logic bomb
  • Worm
  • OPSEC
  • Trojan House
  • Virus

Questão 21

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

Questão 22

Questão
Which one of the statement is a formula to find plain in RSA
Responda
  • 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)

Questão 23

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

Questão 24

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

Questão 25

Questão
The word asymmetric in public key cryptography means
Responda
  • 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

Questão 26

Questão
A _________ cipher replaces one character with another character.
Responda
  • Substitution
  • Transposition
  • Reversing
  • Cultivation
  • Multiplication

Questão 27

Questão
Which one of the statement is a formula to find cipher in RSA
Responda
  • 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)

Questão 28

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

Questão 29

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

Questão 30

Questão
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]
Responda
  • 24

Questão 31

Questão
Which of the following statement is properties of public key encryption
Responda
  • 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

Questão 32

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

Questão 33

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

Questão 34

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

Questão 35

Questão
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]
Responda
  • public key

Questão 36

Questão
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
Responda
  • Zombie
  • Virus
  • Logical Bomb
  • OPSEC
  • Worm

Questão 37

Questão
According to DAD triad, _______ attempts to defeat availability
Responda
  • Destruction
  • Availability
  • Disclosure
  • Alteration
  • Confidentiality

Questão 38

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

Questão 39

Questão
______ 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
Responda
  • Asymmetric encryption
  • Symmetric encryption
  • Synchronous encryption
  • None of the statements
  • Asynchronous encryption

Questão 40

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

Questão 41

Questão
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]
Responda
  • 7

Questão 42

Questão
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
Responda
  • public and private keys
  • plain and cipher keys
  • none of the statements
  • public and cipher keys
  • encryption and decryption keys

Questão 43

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

Questão 44

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

Questão 45

Questão
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?
Responda
  • P=5; q=7
  • P=6; q=8
  • P=q=e=5
  • P=1; q=35
  • p = q= n = 35

Questão 46

Questão
which of the following statement is not true
Responda
  • 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

Questão 47

Questão
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
Responda
  • virtual private network
  • demilitarized zone
  • anti-spoofing
  • firewalls
  • network address translation

Questão 48

Questão
you can use _________ to protect your computer from outsiders
Responda
  • 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

Questão 49

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

Questão 50

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

Questão 51

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

Questão 52

Questão
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]
Responda
  • 24

Questão 53

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

Questão 54

Questão
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
Responda
  • virus
  • zombie
  • all of the statements
  • worm
  • firewall

Questão 55

Questão
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]
Responda
  • 5

Questão 56

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

Questão 57

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

Questão 58

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

Questão 59

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

Questão 60

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

Questão 61

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

Questão 62

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

Questão 63

Questão
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]
Responda
  • 5

Questão 64

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

Questão 65

Questão
What does firewall do
Responda
  • 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

Questão 66

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

Questão 67

Questão
Which of the statement is true
Responda
  • 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

Questão 68

Questão
What of the following statements is true
Responda
  • 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

Questão 69

Questão
what is decryption algorithm
Responda
  • 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

Questão 70

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

Questão 71

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

Questão 72

Questão
According to dad triad, _______ attempts to defeat confidentiality
Responda
  • disclosure
  • alteration
  • confidentiality
  • availability
  • destruction

Questão 73

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

Questão 74

Questão
According to dad triad, _______ attempts to defeat integrity
Responda
  • Alteration
  • Confidentiality
  • Availability
  • Destruction
  • Disclosure

Questão 75

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

Questão 76

Questão
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
Responda
  • RSA
  • Caesar cipher
  • Playfair Cipher
  • Vigenere Cipher
  • Hill Cipher

Questão 77

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

Questão 78

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

Questão 79

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

Questão 80

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

Questão 81

Questão
Which one of the statement is equation for fi(n)?
Responda
  • 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)

Questão 82

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

Questão 83

Questão
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]
Responda
  • 30

Questão 84

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

Questão 85

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

Questão 86

Questão
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]
Responda
  • private key

Questão 87

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

Questão 88

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

Questão 89

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

Questão 90

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

Questão 91

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

Questão 92

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

Questão 93

Questão
Which of the statement(s) is(are) properties for p an q
Responda
  • 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

Questão 94

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

Questão 95

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

Questão 96

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

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