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CS_InfSec

Descripción

Test sobre CS_InfSec, creado por Dina Kim el 26/03/2019.
Dina Kim
Test por Dina Kim, actualizado hace más de 1 año
Dina Kim
Creado por Dina Kim hace más de 5 años
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Resumen del Recurso

Pregunta 1

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

Pregunta 2

Pregunta
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.
Respuesta
  • Trojan Horse
  • Virus
  • Logic Bomb
  • OPSEC
  • Worm

Pregunta 3

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

Pregunta 4

Pregunta
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
Respuesta
  • public and private keys
  • public and cipher keys
  • encryption and decryption keys
  • none of the statements
  • plain and cipher keys

Pregunta 5

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

Pregunta 6

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

Pregunta 7

Pregunta
What is plaintext?
Respuesta
  • 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

Pregunta 8

Pregunta
Which of the following statement is not true?
Respuesta
  • 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

Pregunta 9

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

Pregunta 10

Pregunta
What is encryption algorithm
Respuesta
  • 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

Pregunta 11

Pregunta
Which of the statement is property for p and q
Respuesta
  • 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

Pregunta 12

Pregunta
DMZ what is one advantage of setting up a DMZ with two firewalls
Respuesta
  • 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

Pregunta 13

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

Pregunta 14

Pregunta
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?
Respuesta
  • p = 5, q = 7
  • p = 1, q = 35
  • p = q = e =5
  • p = 6, q = 8
  • p = q = n = 35

Pregunta 15

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

Pregunta 16

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

Pregunta 17

Pregunta
Which of the following is not true?
Respuesta
  • 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

Pregunta 18

Pregunta
Which of these statements is true
Respuesta
  • 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

Pregunta 19

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

Pregunta 20

Pregunta
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
Respuesta
  • Logic bomb
  • Worm
  • OPSEC
  • Trojan House
  • Virus

Pregunta 21

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

Pregunta 22

Pregunta
Which one of the statement is a formula to find plain in RSA
Respuesta
  • 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)

Pregunta 23

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

Pregunta 24

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

Pregunta 25

Pregunta
The word asymmetric in public key cryptography means
Respuesta
  • 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

Pregunta 26

Pregunta
A _________ cipher replaces one character with another character.
Respuesta
  • Substitution
  • Transposition
  • Reversing
  • Cultivation
  • Multiplication

Pregunta 27

Pregunta
Which one of the statement is a formula to find cipher in RSA
Respuesta
  • 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)

Pregunta 28

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

Pregunta 29

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

Pregunta 30

Pregunta
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]
Respuesta
  • 24

Pregunta 31

Pregunta
Which of the following statement is properties of public key encryption
Respuesta
  • 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

Pregunta 32

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

Pregunta 33

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

Pregunta 34

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

Pregunta 35

Pregunta
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]
Respuesta
  • public key

Pregunta 36

Pregunta
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
Respuesta
  • Zombie
  • Virus
  • Logical Bomb
  • OPSEC
  • Worm

Pregunta 37

Pregunta
According to DAD triad, _______ attempts to defeat availability
Respuesta
  • Destruction
  • Availability
  • Disclosure
  • Alteration
  • Confidentiality

Pregunta 38

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

Pregunta 39

Pregunta
______ 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
Respuesta
  • Asymmetric encryption
  • Symmetric encryption
  • Synchronous encryption
  • None of the statements
  • Asynchronous encryption

Pregunta 40

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

Pregunta 41

Pregunta
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]
Respuesta
  • 7

Pregunta 42

Pregunta
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
Respuesta
  • public and private keys
  • plain and cipher keys
  • none of the statements
  • public and cipher keys
  • encryption and decryption keys

Pregunta 43

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

Pregunta 44

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

Pregunta 45

Pregunta
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?
Respuesta
  • P=5; q=7
  • P=6; q=8
  • P=q=e=5
  • P=1; q=35
  • p = q= n = 35

Pregunta 46

Pregunta
which of the following statement is not true
Respuesta
  • 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

Pregunta 47

Pregunta
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
Respuesta
  • virtual private network
  • demilitarized zone
  • anti-spoofing
  • firewalls
  • network address translation

Pregunta 48

Pregunta
you can use _________ to protect your computer from outsiders
Respuesta
  • 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

Pregunta 49

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

Pregunta 50

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

Pregunta 51

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

Pregunta 52

Pregunta
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]
Respuesta
  • 24

Pregunta 53

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

Pregunta 54

Pregunta
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
Respuesta
  • virus
  • zombie
  • all of the statements
  • worm
  • firewall

Pregunta 55

Pregunta
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]
Respuesta
  • 5

Pregunta 56

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

Pregunta 57

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

Pregunta 58

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

Pregunta 59

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

Pregunta 60

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

Pregunta 61

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

Pregunta 62

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

Pregunta 63

Pregunta
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]
Respuesta
  • 5

Pregunta 64

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

Pregunta 65

Pregunta
What does firewall do
Respuesta
  • 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

Pregunta 66

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

Pregunta 67

Pregunta
Which of the statement is true
Respuesta
  • 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

Pregunta 68

Pregunta
What of the following statements is true
Respuesta
  • 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

Pregunta 69

Pregunta
what is decryption algorithm
Respuesta
  • 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

Pregunta 70

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

Pregunta 71

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

Pregunta 72

Pregunta
According to dad triad, _______ attempts to defeat confidentiality
Respuesta
  • disclosure
  • alteration
  • confidentiality
  • availability
  • destruction

Pregunta 73

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

Pregunta 74

Pregunta
According to dad triad, _______ attempts to defeat integrity
Respuesta
  • Alteration
  • Confidentiality
  • Availability
  • Destruction
  • Disclosure

Pregunta 75

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

Pregunta 76

Pregunta
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
Respuesta
  • RSA
  • Caesar cipher
  • Playfair Cipher
  • Vigenere Cipher
  • Hill Cipher

Pregunta 77

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

Pregunta 78

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

Pregunta 79

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

Pregunta 80

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

Pregunta 81

Pregunta
Which one of the statement is equation for fi(n)?
Respuesta
  • 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)

Pregunta 82

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

Pregunta 83

Pregunta
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]
Respuesta
  • 30

Pregunta 84

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

Pregunta 85

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

Pregunta 86

Pregunta
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]
Respuesta
  • private key

Pregunta 87

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

Pregunta 88

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

Pregunta 89

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

Pregunta 90

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

Pregunta 91

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

Pregunta 92

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

Pregunta 93

Pregunta
Which of the statement(s) is(are) properties for p an q
Respuesta
  • 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

Pregunta 94

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

Pregunta 95

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

Pregunta 96

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