Quiz
CS_InfSec
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Perguntas do quiz (96)
1 Which of the following is not a fundamental security goal?
- Aassurance
- Bconfidentiality
- Call of the statements are correct
- Dintegrity
- Eavailability
2A 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.
- ATrojan Horse
- BVirus
- CLogic Bomb
- DOPSEC
- EWorm
3A(n) ____ is one that encrypts a digital data stream one bit or one byte at a time
- Astream cipher
- Bsymmetric cipher
- Cnone of the statements
- Dasymmetric cipher
- Eblock cipher
4A 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
- Apublic and private keys
- Bpublic and cipher keys
- Cencryption and decryption keys
- Dnone of the statements
- Eplain and cipher keys
5Free from mistake or error and having the value that the end-user expects
- AAccuracy
- BAuthenticity
- CConfidentiality
- DAvailability
- EAuthentication
6Which of these is possibly the worst password that user can choose
- ANursulatan1612
- Bk@zaKh
- Ca$tana8567
- DaLm4tyc?TY
- Enone of the statements
7What is plaintext?
- Athe original intelligible message or data that is fed into the algorithm as input
- Bthe original intelligible message or data that is produced as output
- Cnone of the statements
- Dthe scrambled message produced as output
- Ethe scrambled message or data that is fed into the algorithm as output
8Which of the following statement is not true?
- AThe public key is kept secret while the private key may be widely distributed
- BAsymmetric cryptography is a form of cryptography in which a user has a pair of cryptographic keys
- CThe public key and private key are mathematically related
- DThe private key cannot be practically derived from the public
- EAsymmetric cryptography is also known as public key cryptography
9A function that is easily computed and the calculation of its inverse is infeasible unless certain privileged information is known
- ATrapdoor one-way function
- BVirus
- CLogical Bomb
- DTrojan Horse
- EWorm
10What is encryption algorithm
- Aperforms various substitutions and transformations on the plaintext
- Bit takes the ciphertext and the secret key and produces the original plaintext
- Cthe scrambled message produced as output
- Dperforms various substitutions and transformations on the ciphertext
- Erandom stream of data and, as it stands, is unintelligible
11 Which of the statement is property for p and q
- Ap and q are prime
- Bp is greater than q
- Cp and q should be of similar bit length
- Dp and q are distinct
- Ep - q -1
12DMZ what is one advantage of setting up a DMZ with two firewalls
- Ayou can control where traffic goes in the three networks
- Byou can do stateful packet filtering
- Cyou can do load balancing
- Dimproved network performance
- Eall of the statements
13Program that can replicate itself and send copies from computer to computer across network connections. usually performs some unwanted function
- Aworm
- Btrojan house
- Cvirus
- Dlogical bomb
- Eopsec
14In 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?
- Ap = 5, q = 7
- Bp = 1, q = 35
- Cp = q = e =5
- Dp = 6, q = 8
- Ep = q = n = 35
15Encrypt the message WELCOME! Using Caesar cipher with the key = 34’
[blank_start]Answer[blank_end]- Aemtkwum!
16Which of the following is form of malware
- Aall of the statements are correct
- Brootkits
- Cviruses
- Dworms
- Escripts
17Which of the following is not true?
- AA user must protect his/her public key
- BA user does not have to protect his/her public key
- CA user will have his/her own public key
- DA user will have his/her own private key
- EA user must remember his/her password that encrypts the public key
18Which of these statements is true
- AIn symmetric key cryptography the key that is used to encrypt data is the same key that is used to decrypt it
- BThe encryption algorithm performs its steps using the key to alter the ciphertext and convert it to plaintext
- CThe term "key" comes from the fact that the password you can choose works in the same way that a conventional key works
- DIn cryptography, to protect the contents of your files, you can install a lock on your door
- EThe decryption algorithm performs its steps using the key to alter the plaintext and convert it to ciphertext
19The _________ is a number or a set of numbers on which the cipher operates
- Akey
- Bplaintext
- Ccipher
- Dsecret
- Eciphertext
20embedded 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
- ALogic bomb
- BWorm
- COPSEC
- DTrojan House
- EVirus
21The quality of state of having ownership or control of some object or item
- Apossession
- Bconfidentiality
- Cintegrity
- Dutility
- Eauthentication
22Which one of the statement is a formula to find plain in RSA
- AM = c^d(mod n)
- BM = c^n(mod d)
- CM = c^e(mod n)
- DM = c^e(mod d)
- EM = c^n(mod e)
23One objective of cryptography is property of being accessible and usable upon demand by an authorized entity
- Aavailability
- Bdenial of service
- Cconfidentiality
- Dreliability
- Eauthentication
24The vigenere cipher is which of the following types
- Apolyalphabetic
- Bmonoalphabetic
- Cnone of the statements
- Dasymmetric
- Ediaplhabetic
25The word asymmetric in public key cryptography means
- AThe key to encrypt is different to the key to decrypt
- BThe algorithm to encrypt is different from the algorithm to decrypt
- CNone of the listed answers
- DThe key to encrypt is the same with the key to decrypt
- EThe algorithm to encrypt is the same with the algorithm to decrypt
26A _________ cipher replaces one character with another character.
- ASubstitution
- BTransposition
- CReversing
- DCultivation
- EMultiplication
27Which one of the statement is a formula to find cipher in RSA
- AC =m^e(mod n)
- BC =m^n(mod d)
- CC =m^d(mod n)
- DC =m^n(mod e)
- EC =m^e(mod d)
28In the rsa key the public key of a given user is e=31, n=3599. What is the value of p and q
- AP= 61, Q= 59
- BP= 1, Q= 3599
- CP= Q = N= 3599
- DP= Q= E = 31
- EP= 62, Q= 60
29Find d using rsa algorithm, if p = 5, q= 11, e = 3; M = 9
[blank_start]Answer[blank_end]- A27
30In 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]- A24
31Which of the following statement is properties of public key encryption
- Athe sender and receiver must each have one of the matched pair of keys(not the same one)
- Bone algorithm is used for encryption and decryption with a pair of keys, one for encryption and one for decryption
- Cone of the two keys must be kept secret
- Dthe sender and receiver must share the algorithm and the key
- Ethe same algorithm with the same key is used for encryption and decryption
32If a wrong key is entered to decrypt a message what will happen
- AThe output will be gibberish
- BThe output will not be visible
- CThere is an error message
- DThe cryptosystem will stop working
- ENothing will happen
33A ___ - level proxy inspects the entire packet and makes access decisions based on the contents of the packet
- AApplication
- BPhysical
- CServer
- DProxy
- ECircuit
34One objective of cryptography is keeping information secret from all but those who are authorised to see it. The term referring to this is:
- AConfidentiality
- BSecrecy
- CWitnessing
- DAuthorisation
- EAnonymity
35One 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]- Apublic key
36A 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
- AZombie
- BVirus
- CLogical Bomb
- DOPSEC
- EWorm
37According to DAD triad, _______ attempts to defeat availability
- ADestruction
- BAvailability
- CDisclosure
- DAlteration
- EConfidentiality
38The process of verifying and identify claimed by or for a system entity
- AAuthentication
- BTimestamping
- CConfirmation
- DProcessing
- EValidation
39______ 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
- AAsymmetric encryption
- BSymmetric encryption
- CSynchronous encryption
- DNone of the statements
- EAsynchronous encryption
40One objective of cryptography is conveyance, to another entity, of official sanction to do or be something. The term referring to this is:
- AAuthorisation
- BEntity authentication
- CValidation
- DCertificate
- EConfirmation
41 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]- A7
42A 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
- Apublic and private keys
- Bplain and cipher keys
- Cnone of the statements
- Dpublic and cipher keys
- Eencryption and decryption keys
43Set of hacker tools after attacker has broken into a computer system and gained root-level access
- Arootkits
- Broot-level hack
- Cassets
- Dzombie
- Evirus
44Which of the following statement is ingredients for a public key encryption scheme
- Aall of the statements
- Bencryption/decryption algorithm
- Cplaintext
- Dpublic/private keys
- Eciphertext
45In 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?
- AP=5; q=7
- BP=6; q=8
- CP=q=e=5
- DP=1; q=35
- Ep = q= n = 35
46which of the following statement is not true
- Athe public key can be used to derive the private key
- Bthe foundation of public-key algorithm is a one way function
- Call of the listed answers are true
- Dthe private key operates as a trap door that allows the owner to recover the original data
- Ereversing the process of encryption is virtually impossible without the private key
47Consists 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
- Avirtual private network
- Bdemilitarized zone
- Canti-spoofing
- Dfirewalls
- Enetwork address translation
48you can use _________ to protect your computer from outsiders
- Aantivirus software and personal firewall programs
- Bsystem restore and antivirus software
- Cpersonal firewall programs and system restore
- Dantivirus software and the Recycle Bin
- Efirewall programs and the Recycle Bin
49One objective of cryptography is ensuring information has not been altered by unauthorised or unknown means. The term referring to this is:
- Adata integrity
- Bmessage authentication
- Cconfirmation
- Dauthorisation
- Evalidation
50encrypt the message WELCOME! Using Caesar cipher with the key = 5
[blank_start]Answer[blank_end]- ABJQHTRJ!
51A form of cryptosystem in which encryption and decryption are performed using the same key. Also known as conventional encryption
- ASymmetric encryption
- BOne key encryption
- CPrivate key encryption
- DAsymmetric encryption
- ESame key encryption
52In 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]- A24
53A secret data value usually a character string that’s used as authentication information
- Apassword
- Bsecret key
- Ckey
- DOPSEC
- EDMZ
54code embedded within a program that causes a copy of itself to be inserted in one of more other programs. Usually performs some unwanted function
- Avirus
- Bzombie
- Call of the statements
- Dworm
- Efirewall
55In 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]- A5
56Secret undocumented entry point into a program, used to grant access without normal methods of access authentication
- ATrapdoor
- BVirus
- CTrojan Horse
- DLogic Bomb
- EWorm
57One objective of cryptography is identifying and acknowledging the identity of entity. The term referring to this is:
- Aidentification
- Bmessage authentication
- Cconfirmation
- Dvalidation
- Ewitnessing
58Decipher the ciphertext QMHXIVQ using Caesar Cipher with the key = 4
[blank_start]Answer[blank_end]- Amidterm
59Weakness of a system that could be accidentally or intentionally exploited to damage assets
- AVulnerabilities
- BDMZ
- CRisk
- DTreats
- EAssets
60Some _____ firewalls are able to examine the contents of packets as well as the headers for signs that they ate legitimate.
- AStateful
- BPersonal
- CStateless
- DBoundary
61provides a user with protection against discovery and misuse of his or her identity by other users
- Aprivacy
- Bmisuse
- Cidentification
- Dptotection
- Eall of the statements
62Use the playfair cipher with the keyword “PLAYFAIR” to encrypt the message “GOTO”
[blank_start]Answer[blank_end]- AOVNQ
63In 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]- A5
64Base elements of information such as numbers, letters, symbols and so on which are processed or carried out by human (or by some machine)
- AData
- BContext
- CBytes
- DInformation
- EBits
65What does firewall do
- AProtects your computer from internet intrusion
- BRestores lost data on your computer
- CChecks floppy or CDs for corrupted files
- DScans for viruses on your system
- EProtects against power surges
66Perform decryption using the rsa algorithm if p = 5; q = 11, e = 3; c =14
[blank_start]answer[blank_end]- A9
67Which of the statement is true
- AThe larger the key size the greater the range of possible values a key can be
- BThe larger the key size the smaller the range of possible values a key can be
- CThe larger the key size the range of possible values a key can be remains the same
- DThe smaller the key size the greater the range of possible values a key can be
- EThe smaller the key size the range of possible values a key can be remains the same
68What of the following statements is true
- APublic key algorithms are slow compared to symmetric cryptography
- BNone of the listed answers
- CPublic key algorithms are used to hash the password
- DPublic key algorithms are used to encrypt the message
- EPublic key algorithms are used to encrypt the key encryption key
69what is decryption algorithm
- Atakes the ciphertext and the secret key and produces the original plaintext
- Bnone of the statements are true
- Cthe original intelligible message or data that is fed into the algorithm as input
- Dthe scrambled message produced as output
- Eperforms various substitutions and transformations on the plaintext
70A stateful firewall maintains a ______ , which is a list of active connections
- AState table
- BConnection table
- CHub table
- DRouting table
- EBridging table
71Possibility of an incident or attack to cause damage to your enterprise
- ARisk
- BVirus
- CSecurity
- DAssets
- EMalware
72According to dad triad, _______ attempts to defeat confidentiality
- Adisclosure
- Balteration
- Cconfidentiality
- Davailability
- Edestruction
73Find d using rsa algorithm, if p = 3, q= 11, e = 7; M = 5
[blank_start]Answer[blank_end]- A3
74According to dad triad, _______ attempts to defeat integrity
- AAlteration
- BConfidentiality
- CAvailability
- DDestruction
- EDisclosure
75One objective of cryptography is prevention of authorized access to resources or the delaying of time-critical operations
- ADenial of service
- BConfidentiality
- CAvailability
- DAuthentication
- EReliability
76A 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
- ARSA
- BCaesar cipher
- CPlayfair Cipher
- DVigenere Cipher
- EHill Cipher
77 Which of the following statements are types of firewalls?
- AApplication level gateways
- BPacket – filtering
- CCircuit-level gateways
- DSession-level gateways
- EInternet-level gateways
78What will be the value of key in Caesar Cipher if initially key = 65
[blank_start]Answer[blank_end]- A13
79The key used in a symmetric encryption system. Both participants must share the same key and this key must remain secret to protect communication
- ASecret key
- BSymmetric key
- CPublic key
- DPrivate key
- EAsymmetric key
80if you encrypt a ciphertext using right key, you will get
- Agibberish
- Bciphertext
- Cplaintext
- Derror message
- Ekey
81Which one of the statement is equation for fi(n)?
- AFi(n) = (p-1)(q-1)
- BFi(n) = (p-1)(q)
- CFi(n) = (p-q)(q-1)
- DFi(n) = pq
- EFi(n) = (p)(q-1)
82Which of the following statement(s) is(are) the Security Principles
- AAll of the statements
- BSeparation of privileges
- CLeast privilege
- DDefense in depth
- ESecurity through obscurity (the inadvisability thereof)
83In 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]- A30
84The Caesar cipher is a _______ cipher that has a key of 3
- AShift
- BTransposition
- CAdditive
- DSubtractive
- EMultiplicative
85Secret undocumented entry point into a program, used to grant access without normal methods of access authentication
- ATrapdoor
- BVirus
- CWorm
- DTrojan Horse
- ELogic Bomb
86One 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]- Aprivate key
87Which of these is not considered as a symmetric key algorithm
- Arsa
- Bplayfair cipher
- Chill cipher
- Dcaesar cipher
- Evigenere cipher
88The quality of state of being genuine or original rather than a reproduction or fabrication
- AAuthenticity
- BAvailability
- CAuthentication
- DConfidentiality
- EAccuracy
89Perform encryption using the rsa algorithm if p = 3 q= 11 e = 7 M = 5
[blank_start]Answer[blank_end]- A14
90A process of identifying, analysing and controlling critical information
- AOPSEC
- BFirewall
- CScanning
- DDMZ
- EAnti-virus
91____ is another term for a packet of digital information
- Adatagram
- Bdata
- Cbits
- Dheader
- Efooter
92 ________ is the science and art of transforming messages to make them secure and immune to attacks
- ACryptography
- BCryptosystem
- CNone of the statements
- DCryptoanalysis
- EConfidentiality
93Which of the statement(s) is(are) properties for p an q
- Ap an q are prime
- Bp an q are distinct
- Cp = q -1
- Dp is greater than q
- Ep and q should be of similar bit length
94The translation of encrypted text or data (called ciphertext) into original text or data (called plaintext). Also called deciphering
[blank_start]answer[blank_end]- Adecryption
95Which of these is not considered as a symmetric key algorithm
- ARSA
- BHill Cipher
- CPlayfair Cipher
- DCaesar cipher
- EVigenere Cipher
96A combination of an encryption algorithm and decryption is called a _____
- ACipher
- BKey
- CPolyalphabetic cipher
- DSecret
- ESubstitution
Informações
- Descrição
- Quiz sobre CS_InfSec, criado por Dina Kim em 26-03-2019.
- Autor
- Dina Kim
- Idioma
- English
- Visualizações
- 173
- Histórico
- Criado em 26 mar 2019 · atualizado em 28 mar 2019
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