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Information security and data protection

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- at Test sobre Information security and data protection, creado por хомяк убийца el 12/05/2018.
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Resumen del Recurso

Pregunta 1

Pregunta
What is the purpose of access control list?
Respuesta
  • to enforce a specified security policy
  • to prevent unauthorised access to data
  • to emphasize encryption
  • it is a key distribution center

Pregunta 2

Pregunta
Identify definition of authentication
Respuesta
  • establishes the identity of a subject
  • specifies and enforces that each object is accessed correctly and only by those that are allowed to do so
  • to enforce a specified security policy
  • to emphasize encryption

Pregunta 3

Pregunta
What does Access Control Information cover?
Respuesta
  • data, resources
  • AC policy
  • functions such as grant, deny
  • decisions

Pregunta 4

Pregunta
What does Access Control Enforcement cover?
Respuesta
  • data, resources
  • AC policy
  • functions such as grant, deny
  • decisions

Pregunta 5

Pregunta
What does Access Control Decision Function cover?
Respuesta
  • data, resources
  • AC policy
  • granting and denying access
  • decisions

Pregunta 6

Pregunta
Define a subject of Access Control List
Respuesta
  • an active entity requesting for resource access
  • a passive entity and target of the protection
  • an access control decision function
  • an access control information function

Pregunta 7

Pregunta
Define an object of Access Control List
Respuesta
  • an active entity requesting for resource access
  • a passive entity and target of the protection
  • an access control decision function
  • an access control information function

Pregunta 8

Pregunta
How many types of resource dependent access controls exist?
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 9

Pregunta
How many types of access control mechanisms exist
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 10

Pregunta
Find an example of resource dependent access for network access
Respuesta
  • append
  • execute
  • redirected
  • granted

Pregunta 11

Pregunta
Find an example of resource dependent access for file access
Respuesta
  • append
  • execute
  • redirected
  • granted

Pregunta 12

Pregunta
Find incorrect access control goal
Respuesta
  • invalid operations should be permitted
  • every actions should be checked
  • unnecessary access should not be allowed
  • all the above mentioned

Pregunta 13

Pregunta
What is a property of the capability ticket in access control list?
Respuesta
  • Specifies a given subject can perform what operations on what objects
  • Subjects does not grant rights to other subjects
  • Users have only one ticket
  • Access rights given to a subject are valid for forever

Pregunta 14

Pregunta
What is a property of the procedure oriented objects in access control list?
Respuesta
  • Objects are encapsulated, permitting only certain specified accesses via program execution
  • Specifies a given subject can perform what operations on what objects
  • Access rights given to a subject are valid for forever
  • Users have only one ticket

Pregunta 15

Pregunta
What is a property of the procedure oriented objects in access control list?
Respuesta
  • Enforces accesses to an object be done through a trusted interface
  • Specifies a given subject can perform what operations on what objects
  • Access rights given to a subject are valid for forever
  • Users have only one ticket

Pregunta 16

Pregunta
What does multilevel security mean?
Respuesta
  • Classification of information by the level of importance and permission of access by users with different security clearance
  • Classification of information by date and permission of access by users with different security clearance
  • Classification of information by the level of importance and permission of access by users name
  • Classification of information by date and permission of access by users name

Pregunta 17

Pregunta
How many levels are covered in multilevel security
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 18

Pregunta
No read up (read down) means
Respuesta
  • A subject can only read an object of less or equal security level
  • A subject can only write into an object of greater or equal security level
  • A subject can only read an object of more or equal security level
  • A subject can only write into an object of less or equal security level

Pregunta 19

Pregunta
No write down (write up) means
Respuesta
  • A subject can only read an object of less or equal security level
  • A subject can only write into an object of greater or equal security level
  • A subject can only read an object of more or equal security level
  • A subject can only write into an object of less or equal security level

Pregunta 20

Pregunta
Define a malware attacks
Respuesta
  • Malicious software causes data compromises
  • A browser helper object that detects changes to URL and logs
  • Users are tricked by fraudulent messages into giving out information
  • The lookup of host names is altered to send users to a fraudulent server

Pregunta 21

Pregunta
How many types of authentication schemes exist?
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 22

Pregunta
Define a change cipher spec
Respuesta
  • All data sent/received by software that uses SSL
  • used to carry handshake messages
  • used to indicates a change in the encryption and authentication of records
  • used to indicate when the connection is about to close

Pregunta 23

Pregunta
Define an alert
Respuesta
  • All data sent/received by software that uses SSL
  • used to carry handshake messages
  • used to indicates a change in the encryption and authentication of records
  • used to indicate when the connection is about to close

Pregunta 24

Pregunta
Which of the following is true about importance of hash functions i. High Computational Load ii. Message Overhead iii. Security Limitations
Respuesta
  • i only
  • none
  • All the mentioned
  • iii only

Pregunta 25

Pregunta
What does “computationally infeasible to find data mapping to specific hash” mean
Respuesta
  • One way property
  • Collision free property
  • Second way property
  • Collision property

Pregunta 26

Pregunta
Which of the following is not property of hash functions?
Respuesta
  • One wayness
  • Preimage resistance
  • Strong collision resistance
  • Long, unfixed output

Pregunta 27

Pregunta
How many types of hash constructions exist?
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 28

Pregunta
Output length for SHA-1
Respuesta
  • 128
  • 160
  • 512
  • 314

Pregunta 29

Pregunta
Input length for SHA-1
Respuesta
  • 512
  • 2014
  • 160
  • 314

Pregunta 30

Pregunta
Which construction method support SHA?
Respuesta
  • Schnorr
  • Diffie-Hellman
  • Merkle-Damgard
  • Alice & Bob

Pregunta 31

Pregunta
How many rounds in general hold SHA-1?
Respuesta
  • 50
  • 60
  • 70
  • 80

Pregunta 32

Pregunta
How many stages hold SHA-1?
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 33

Pregunta
How many rounds support one stage?
Respuesta
  • 10
  • 20
  • 80
  • 79

Pregunta 34

Pregunta
Name of the function that SHA-1 use
Respuesta
  • Merkle-Damgard
  • Feistel
  • Schnorr
  • Diffie-Hellman

Pregunta 35

Pregunta
How many types of SHA exist ?
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 36

Pregunta
How many rounds MD5 hold in general?
Respuesta
  • 64
  • 80
  • 512
  • 160

Pregunta 37

Pregunta
Which of the following does not refer to security requirements of Hash functions?
Respuesta
  • Preimage resistance
  • Second preimage resistance
  • Collision resistance
  • High Computational Load

Pregunta 38

Pregunta
The purpose of hash function is to
Respuesta
  • Create a message
  • Compress a message
  • Divide a message
  • Conquer a message

Pregunta 39

Pregunta
How many constant keys support SHA algorithm ?
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 40

Pregunta
Which of the following refers requirement of digital signature?
Respuesta
  • Must be relatively hard to produce
  • Must be relatively hard to recognize
  • Must depend on the message verified
  • Must to be computationally infeasible to forge

Pregunta 41

Pregunta
Which of the following refers requirement of digital signature?
Respuesta
  • Must be relatively hard to produce
  • Must be relatively hard to recognize
  • Must depend on the message verified
  • Must to be practical to save digital signature in storage

Pregunta 42

Pregunta
What is the property of direct digital signature?
Respuesta
  • Assumed receiver has sender’s private key
  • Involves only sender
  • Can encrypt using receiver’s public key
  • Assumed sender has receiver’s private key

Pregunta 43

Pregunta
Which of the following does not refer to characteristics of digital signature?
Respuesta
  • Private/public is generated by receiver
  • A durable private/public key pair
  • A disposable private/public key pair
  • Signature is two numbers, depending on message hash and secret information

Pregunta 44

Pregunta
How many message authentication functions exist?
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 45

Pregunta
If public key encryption is used
Respuesta
  • Encryption provides no confidence of sender
  • Encryption provides with some level of confidence of sender
  • Encryption provides fully confidence of sender
  • Encryption does not provided at all

Pregunta 46

Pregunta
In public key cryptography sender signs message using their
Respuesta
  • Public key
  • Shared key
  • Private key
  • Third key

Pregunta 47

Pregunta
In public key cryptography sender signs message using their private key, then encrypts with recipient’s
Respuesta
  • Private key
  • Public key
  • Single key
  • Key

Pregunta 48

Pregunta
What is authentication?
Respuesta
  • The process of verifying a claimed identity
  • Identification of user
  • Access control
  • Accounting of service

Pregunta 49

Pregunta
Define AAA.(triple A)
Respuesta
  • Access After Anyone
  • Authentication Authorization Accounting
  • Authentication Authorization Access
  • Authentication Access Accounting

Pregunta 50

Pregunta
Which of the term refers to authorization?
Respuesta
  • The user identity is a parameter in access control decisions
  • The user identity is recorded when logging security
  • The process of verifying a claimed identity
  • Accounting of service

Pregunta 51

Pregunta
Which of the term refers to accounting?
Respuesta
  • The user identity is a parameter in access control decisions
  • The user identity is recorded when logging security
  • The process of verifying a claimed identity
  • Accounting of service

Pregunta 52

Pregunta
PIN, passwords refer to
Respuesta
  • Something you have
  • Something you know
  • Something you are
  • Combined method

Pregunta 53

Pregunta
Keys, soft tokens refer to
Respuesta
  • Something you have
  • Something you know
  • Something you are
  • Combined method

Pregunta 54

Pregunta
Fingerprint, iris, palm recognition refer to
Respuesta
  • Something you have
  • Something you know
  • Something you are
  • Combined method

Pregunta 55

Pregunta
Combined or multiple methods of authentication are used for
Respuesta
  • Lower level assurance
  • Medium level assurance
  • Higher level assurance
  • Not used at all

Pregunta 56

Pregunta
How many phases are exist in biometric?
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 57

Pregunta
When fingerprint was developed?
Respuesta
  • 1988
  • 1888
  • 1887
  • 1987

Pregunta 58

Pregunta
What is minutia ?
Respuesta
  • Time
  • comparisons of one print with another can be made
  • comparison of eyes
  • comparison of palms

Pregunta 59

Pregunta
What is TTP?
Respuesta
  • TTP certifies trustworthiness of binding public key with its rightful owner’s identity
  • TTP certifies trustworthiness of binding private key with its rightful owner’s
  • To enable the validation and to give legal meaning to digital signature
  • Answers for supporting encryption/decryption algorithms

Pregunta 60

Pregunta
Define X.509
Respuesta
  • TTP certifies trustworthiness of binding public key with its rightful owner’s identity
  • TTP certifies trustworthiness of binding private key with its rightful owner’s identity
  • To enable the validation and to give legal meaning to digital signature
  • Answers for supporting encryption/decryption algorithms

Pregunta 61

Pregunta
Define a Kerberos
Respuesta
  • Trusted third party authentication system and makes no use of public key cryptography
  • TTP certifies trustworthiness of binding private key with its rightful owner’s identity
  • To enable the validation and to give legal meaning to digital signature
  • Answers for supporting encryption/decryption algorithms

Pregunta 62

Pregunta
Which of the following does not refer for Kerberos property
Respuesta
  • Impeccability
  • Containment
  • Transparency
  • Viciousness
  • Подписываемся на мой инстаграм @beketoo

Pregunta 63

Pregunta
What is a security?
Respuesta
  • The protection of information assets through the use of technology, processes, and training
  • The presence of weaknesses or loopholes in systems which may lead (systematically) to cyber attacks
  • Occurs when a system is compromised based on a vulnerability by an unknown exploit
  • Ensures that computer-related assets are accessed only by authorized parties

Pregunta 64

Pregunta
What is a vulnerability?
Respuesta
  • The protection of information assets through the use of technology, processes, and training
  • The presence of weaknesses or loopholes in systems which may lead (systematically) to cyber attack
  • Occurs when a system is compromised based on a vulnerability by an unknown exploit
  • Ensures that computer-related assets are accessed only by authorized parties

Pregunta 65

Pregunta
What is an attack?
Respuesta
  • The protection of information assets through the use of technology, processes, and training
  • Written to take advantage of a vulnerability; could be a piece of software; a technology; or data that can cause damage or change the behavior of a computer
  • The presence of weaknesses or loopholes in systems which may lead (systematically) to cyber attacks.
  • Occurs when a system is compromised based on a vulnerability by an unknown exploit

Pregunta 66

Pregunta
Types of Threats
Respuesta
  • Interception, Interruption, Modification, Fabrication
  • Method, Opportunity, Motive
  • Confidentiality, Integrity, Availability, Authentication
  • Non-repudiation, Authorisation/Access control, Destruction

Pregunta 67

Pregunta
How to protect?
Respuesta
  • Encryption, Software control, Hardware control, Policies and Procedures,Physical control
  • Method, Opportunity, Motive
  • Confidentiality, Integrity, Availability, Authentication
  • Non-repudiation, Authorisation/Access control, Destruction

Pregunta 68

Pregunta
Interception is __
Respuesta
  • Asset lost, unusable,unavailable
  • Unauthorized access
  • Unauthorized change, tamper of data
  • Ex. Unauthorized add data to a DB

Pregunta 69

Pregunta
Security goals are:
Respuesta
  • CIA
  • CEA
  • CLA
  • CDD

Pregunta 70

Pregunta
Confidentiality means
Respuesta
  • messages exchanged across network remains private
  • contents of messages are not modified while in transit
  • determining the identity of entities involved in message exchanges
  • determining the resources that an entities are allowed to access and in what manner

Pregunta 71

Pregunta
Deterrence is
Respuesta
  • Punishment makes attackers think twice –Examples include laws and organisational policy
  • Reduce likelihood and save cost of incidents ◦ ( Ex.: Firewalls, router access control list, spam filters, virus scanners)
  • Need alert if breach occurs –Collection of evidence ◦ ( ex.: Audit logs, intrusion detection system, network traffic monitoring)
  • Punishment by taking money

Pregunta 72

Pregunta
Defence is
Respuesta
  • Punishment makes attackers think twice –Examples include laws and organisational policy
  • Reduce likelihood and save cost of incidents ◦ ( Ex.: Firewalls, router access control list, spam filters, virus scanners)
  • Need alert if breach occurs –Collection of evidence ◦ ( ex.: Audit logs, intrusion detection system, network traffic monitoring)
  • Punishment by taking money

Pregunta 73

Pregunta
Detection is
Respuesta
  • Punishment makes attackers think twice –Examples include laws and organisational policy
  • Reduce likelihood and save cost of incidents ◦ ( Ex.: Firewalls, router access control list, spam filters, virus scanners)
  • Need alert if breach occurs –Collection of evidence ◦ ( ex.: Audit logs, intrusion detection system, network traffic monitoring)
  • Punishment by taking money

Pregunta 74

Pregunta
Integrity means
Respuesta
  • messages exchanged across network remains private
  • contents of messages are not modified while in transit
  • determining the identity of entities involved in message exchanges
  • determining the resources that an entities are allowed to access and in what manner

Pregunta 75

Pregunta
Authentication means
Respuesta
  • messages exchanged across network remains private
  • contents of messages are not modified while in transit
  • determining the identity of entities involved in message exchanges
  • determining the resources that an entities are allowed to access and in what manner

Pregunta 76

Pregunta
Non-repudiation means
Respuesta
  • messages exchanged across network remains private
  • contents of messages are not modified while in transit
  • determining the identity of entities involved in message exchanges
  • ensures that parties cannot deny having sent messages

Pregunta 77

Pregunta
DES stands for
Respuesta
  • Demand Encryption Standard
  • Data Encryption Standard
  • Digital Encryption Standard
  • Database Encryption Standard

Pregunta 78

Pregunta
When DES released?
Respuesta
  • 1977
  • 1974
  • 1960
  • 1965

Pregunta 79

Pregunta
Who introduced idea of substitution-permutation (S-P) networks?
Respuesta
  • Shannon
  • Feistal
  • Lucifer
  • Rijndael

Pregunta 80

Pregunta
In how many rounds DES encryption is handled?
Respuesta
  • 16
  • 8
  • 32
  • 4

Pregunta 81

Pregunta
_____ process messages in blocks, each of which is then encrypted/decrypted?
Respuesta
  • block ciphers
  • stream ciphers
  • mode ciphers
  • code ciphers

Pregunta 82

Pregunta
What is the cryptography?
Respuesta
  • study about how hacker should behave
  • study of encryption principles/methods
  • study about message transformation
  • study of the computer system

Pregunta 83

Pregunta
Which cipher is described below: “Each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.”
Respuesta
  • Playfair Cipher
  • Vigenere Cipher
  • Caesar Cipher
  • Kerberos

Pregunta 84

Pregunta
How Cryptography is divided by the way in which plaintext is processed:
Respuesta
  • Substitution and Transposition
  • Single-key or Private key
  • Two- key or Public
  • Block and Stream

Pregunta 85

Pregunta
What is the Key Matrix size in Playfair
Respuesta
  • 3x3
  • 4x4
  • 5x5
  • 9x9

Pregunta 86

Pregunta
Using the Caesar cipher decrypt this message “Vwdb kxqjub, vwdb irrolvk” (key=2)
Respuesta
  • Stay hungry, stay foolish
  • Never give up
  • Dance as if no one sees
  • With the great power comes great responsibility

Pregunta 87

Pregunta
3 Ds of Security: (DDD)
Respuesta
  • Defence, Deterrence, Detection
  • Data, Development, Device
  • Database, Data, Deadline
  • Demand, Design, Decision

Pregunta 88

Pregunta
MOM stands for ____
Respuesta
  • Method, Opportunity, Motive
  • Modification, Operation, Motto
  • Malfunction, Opinion, Management
  • Messages, Opportunity, Monitoring

Pregunta 89

Pregunta
DES is a symmetric cipher
Respuesta
  • True
  • False

Pregunta 90

Pregunta
Block size of DES
Respuesta
  • 256-bits
  • 128-bits
  • 64-bits
  • 32-bits

Pregunta 91

Pregunta
AES stands for
Respuesta
  • Advanced Encryption Standard
  • Advanced Encryption System
  • American Encryption Standard
  • Alias Encryption Standard

Pregunta 92

Pregunta
Advanced Encryption Standard(AES) also known like
Respuesta
  • Rassul
  • Rijndael
  • Feistel

Pregunta 93

Pregunta
Who introduce idea of substitution-permutation?
Respuesta
  • David Shannon
  • Andre Shannon
  • Petre Shannon
  • Claude Shannon

Pregunta 94

Pregunta
In which year was introduced idea of substitution-permutation?
Respuesta
  • 1949
  • 1948
  • 1950
  • 1951

Pregunta 95

Pregunta
What is the plaintext?
Respuesta
  • Original Message
  • Coded Message
  • Algorithm for transforming text
  • Secret key

Pregunta 96

Pregunta
What is not the model of the symmetric cipher?
Respuesta
  • conventional / private-key / single-key
  • sender and recipient share a common key
  • all classical encryption algorithms are private-key
  • was only type prior to invention of public- key in 1982’s

Pregunta 97

Pregunta
What is the Cipher ?
Respuesta
  • algorithm for transforming plaintext to ciphertext
  • coded message
  • original message
  • study of encryption principles/methods

Pregunta 98

Pregunta
What is the cryptanalysis (codebreaking ) ?
Respuesta
  • algorithm for transforming plaintext to cipher text
  • study of principles/methods of deciphering cipher text without knowing key
  • original message
  • study of encryption principles/methods

Pregunta 99

Pregunta
What is the cryptology?
Respuesta
  • field of both cryptography & cryptanalysis
  • original message
  • study of encryption principles/methods
  • algorithm for transforming plaintext to cipher text

Pregunta 100

Pregunta
What are the general approaches for Cryptanalysis?
Respuesta
  • cryptanalytic attack/brute force attack
  • substitution/transposition
  • permutation/transposition
  • substitution/permutation

Pregunta 101

Pregunta
What is Ciphertext only?
Respuesta
  • attacker knows suspects plaintext/ciphertext
  • only know algorithm & ciphertext, is statistical, must know or be able to identify plaintext
  • attacker selects plaintext and gets ciphertext
  • attacker selects ciphertext and gets plaintext

Pregunta 102

Pregunta
How many types of threats exist?
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 103

Pregunta
Authorisation means
Respuesta
  • messages exchanged across network remains private
  • contents of messages are not modified while in transit
  • defining the identity of entities involved in message exchanges
  • determining the resources that an entities are allowed to access and in what manner

Pregunta 104

Pregunta
CIA means
Respuesta
  • Confidentiality, invalid, availability
  • Confidentiality, interact, access
  • Certain, integrity,availability
  • Confidentiality, integrity, availability

Pregunta 105

Pregunta
What is Threat?
Respuesta
  • The presence of weaknesses or loopholes in systems which may lead (systematically) to cyber attacks. A weak link in the software, settings, etc., through which, if not fixed early, someone can get access to the computer, application, and/or network and can cause damage
  • Typical threats include unauthorised access, destruction, system overrun and takeover, propagation of malicious code, data thieving and fabrication;
  • Written to take advantage of a vulnerability; could be a piece of software; a technology; or data that can cause damage or change the behavior of a computer
  • Occurs when a system is compromised based on a vulnerability by an unknown exploit

Pregunta 106

Pregunta
What is ciphertext?
Respuesta
  • coded message
  • original message
  • algorithm for transforming plaintext to ciphertext
  • info used in cipher known only to sender/receiver

Pregunta 107

Pregunta
What is a key?
Respuesta
  • converting plaintext to ciphertext
  • recovering ciphertext from
  • info used in cipher known only to sender/receiver
  • algorithm for transforming plaintext to ciphertext

Pregunta 108

Pregunta
What is encipher (encrypt)?
Respuesta
  • study of encryption principles/methods
  • study of principles/ methods of deciphering ciphertext without knowing key
  • original message
  • converting plaintext to ciphertext

Pregunta 109

Pregunta
What is decipher (decrypt)?
Respuesta
  • converting plaintext to ciphertext
  • recovering ciphertext from plaintext
  • coded message
  • original message
  • recovering plaintext from ciphertext

Pregunta 110

Pregunta
Mostly used symmetric cipher
Respuesta
  • AES
  • DES
  • RSA
  • SHA-1

Pregunta 111

Pregunta
Possible length of AES key
Respuesta
  • 128 156 198
  • 128 192 256
  • 128 184 228
  • 128 164 256

Pregunta 112

Pregunta
How many stages has final round of AES?
Respuesta
  • 1
  • 2
  • 3
  • 4

Pregunta 113

Pregunta
RSA uses
Respuesta
  • two keys - private & publiс
  • one key - only private
  • one key - only public
  • no correct answer

Pregunta 114

Pregunta
What is TRUE about RSA? Each user generates a public/private key pair by:
Respuesta
  • selecting two large primes at random: p, q
  • selecting two small primes at random: p, q
  • selecting three large primes at random: p, q, r
  • selecting only one number at random: p

Pregunta 115

Pregunta
In RSA security relies on a ___ difference in difficulty between ___ (en/decrypt) and ___ (cryptanalyse) problems
Respuesta
  • large enough, easy, hard
  • small enough, hard, easy
  • small enough, easy, hard
  • large enough, hard, easy

Pregunta 116

Pregunta
Advanced Encryption Standard (AES), has three different configurations with respect to number of rounds and
Respuesta
  • Data Size
  • Round Size
  • Key Size
  • Encryption Size

Pregunta 117

Pregunta
_______ is a round cipher based on the Rijndael algorithm that uses a 128-bit block of data.
Respuesta
  • RSA
  • Karberos
  • Caesar
  • AES

Pregunta 118

Pregunta
In asymmetric key cryptography, the private key is kept by
Respuesta
  • sender
  • receiver
  • sender and receiver
  • all the connected devices to the network
  • none of these

Pregunta 119

Pregunta
RSA was developed by:
Respuesta
  • Dr.Tahir El-Gamal
  • Diffie-Hellman
  • Shannon
  • Rivest, Shamir, Adleman

Pregunta 120

Pregunta
Encryption by receiver with sender’s public key:
Respuesta
  • C = Me mod N
  • M=Cd mod N
  • Ya=Xa mod Q
  • C=Km mod Q

Pregunta 121

Pregunta
RSA was founded in:
Respuesta
  • 1975
  • 1976
  • 1977
  • 1974

Pregunta 122

Pregunta
Decryption by sender with sender’s public key:
Respuesta
  • C=Me mod N
  • M=Cd mod N
  • Ya=Xa mod Q
  • C=Km mod Q

Pregunta 123

Pregunta
Calculate n and φ, if p = 3, and q = 11 (RSA)
Respuesta
  • n = 33, φ = 20
  • n = 20, φ = 33
  • n = 33, φ = 33
  • n = 33, φ = 22

Pregunta 124

Pregunta
Calculate n and φ, if p = 17, and q = 11 (RSA)
Respuesta
  • n = 187, φ = 160
  • n = 160, φ = 187
  • n = 187, φ = 187
  • n = 187, φ = 170

Pregunta 125

Pregunta
Calculate C (ciphertext), if p = 3, q = 11, e = 7, M = 2 (RSA)
Respuesta
  • C = 29
  • C = 3
  • C = 22
  • C = 2

Pregunta 126

Pregunta
Calculate M (plaintext), if p = 3, q = 11, d = 3, C = 29 (RSA)
Respuesta
  • M = 2
  • M = 29
  • M = 30
  • M = 1

Pregunta 127

Pregunta
Block size of AES plaintext:
Respuesta
  • 192
  • 164
  • 128
  • 256

Pregunta 128

Pregunta
Maximum AES number of rounds:
Respuesta
  • 10
  • 12
  • 14
  • 16

Pregunta 129

Pregunta
AES size of output(output parameter):
Respuesta
  • 192
  • 128
  • 164
  • 256

Pregunta 130

Pregunta
First public-key type scheme proposed by Diffie & Hellman in
Respuesta
  • 1971
  • 1976
  • 1981
  • 1986

Pregunta 131

Pregunta
Value of key depends on the: (Diffie & Hellman)
Respuesta
  • Participants
  • Keys
  • Message
  • Algorithm

Pregunta 132

Pregunta
If Alice and Bob subsequently communicate, they will have the____ key
Respuesta
  • Same
  • Different
  • Private
  • Public

Pregunta 133

Pregunta
Which of these are true about “a public-key distribution scheme ”?
Respuesta
  • cannot be used to exchange an arbitrary message
  • rather it can establish a common key
  • known only to the two participants
  • all of above

Pregunta 134

Pregunta
When by Diffie & Hellman along with the exposition of public key concepts?
Respuesta
  • 1977
  • 1978
  • 1979
  • none of them

Pregunta 135

Pregunta
Which of them uses two keys( public and private):
Respuesta
  • RSA
  • Caesar
  • Vigenere
  • Playfair

Pregunta 136

Pregunta
A related private-key, known
Respuesta
  • only to the recipient
  • only to the sender
  • none of them
  • to everyone

Pregunta 137

Pregunta
The key must be kept secret for
Respuesta
  • needed security
  • encryption and decryption
  • encryption
  • decryption

Pregunta 138

Pregunta
The _________ attack can endanger the security of the Diffie-Hellman method if two parties are not authenticated to each other.
Respuesta
  • man-in-the-middle
  • ciphertext attack
  • plaintext attack
  • none of the above

Pregunta 139

Pregunta
“Using only a subset of letters/words in a longer message marked in some way ” is__
Respuesta
  • Caesar Cipher
  • RSA
  • DES
  • Steganography

Pregunta 140

Pregunta
For which cipher an example is given: “Say hi to IITU” After encrypt “Yas ih ot UTII”
Respuesta
  • Playfair Cipher
  • Transposition Cipher
  • Route Cipher
  • Steganography

Pregunta 141

Pregunta
Polyalphabetic substitution ciphers improve security using multiple cipher alphabets
Respuesta
  • True
  • False

Pregunta 142

Pregunta
For RSA to work, value of P must be less than value of:
Respuesta
  • P
  • Q
  • n
  • r

Pregunta 143

Pregunta
In symmetric key cryptography, key used by sender and receiver is:
Respuesta
  • shаrеd
  • Different
  • Two keys are used
  • None

Pregunta 144

Pregunta
In symmetric-key cryptography, same key is used by:
Respuesta
  • One Party
  • Multi Party
  • Third Party
  • Both Party

Pregunta 145

Pregunta
RSA stands for
Respuesta
  • Rivеst, Shаmir,, Аdlеmаn
  • Roger, Shamir, Adrian
  • Robert, Shamir, Anthoney
  • Rivest, Shaw, Adleman

Pregunta 146

Pregunta
Which of them is first public-key type scheme?
Respuesta
  • Diffiе & Hеllmаn
  • Elgamal
  • RSA
  • AES

Pregunta 147

Pregunta
When Diffie & Hellman protocol was invented?
Respuesta
  • 1976
  • 1975
  • 1980
  • 1990

Pregunta 148

Pregunta
In Diffie & Hellman key exchange a public key is known only to the two participants
Respuesta
  • True
  • False

Pregunta 149

Pregunta
In Diffie & Hellman key exchange a public key is cannot be used to exchange an arbitrary message
Respuesta
  • True
  • False

Pregunta 150

Pregunta
Diffie & Hellman key exchange based on exponentiation in a finite (Galois) fields
Respuesta
  • True
  • False

Pregunta 151

Pregunta
In Diffie & Hellman protocol when the user A generates their key a secret key should be
Respuesta
  • XА < q
  • generated randomly
  • given by user B
  • none

Pregunta 152

Pregunta
Choose the correct formula for computing public key YA in Diffie & Hellman protocol
Respuesta
  • YА= а mod q
  • BA = a + b
  • CA = a – b
  • DA = a * b

Pregunta 153

Pregunta
Choose the correct formula for computing secret key K by user A in Diffie & Hellman protocol
Respuesta
  • K = (YА)^X А mod q
  • S = a + b
  • D = a * b
  • L = a * b + 2

Pregunta 154

Pregunta
Elgamal cryptography uses exponentiation in a finite (Galois) fields
Respuesta
  • True
  • False

Pregunta 155

Pregunta
In the Elgamal cryptography when the user A generates their key a secret key should be
Respuesta
  • 1 < XА < q-1
  • generated randomly
  • given by user
  • none

Pregunta 156

Pregunta
Choose the correct formula for computing public key YA in Elgamal cryptography
Respuesta
  • YА = аXА mod q
  • K = YАk mod q
  • K = (YА)^X А mod q
  • YА= а mod q

Pregunta 157

Pregunta
Choose the correct formula for computing one-time key K in Elgamal cryptography
Respuesta
  • K = YАk mod q
  • S = a + b + 1
  • D = a * b + 2
  • L = a * b + 3

Pregunta 158

Pregunta
Choose the correct formula for computing C1 in Elgamal cryptography
Respuesta
  • C1 = аk mod q
  • C3 = a mod b
  • C = z + 2 + 5
  • C5 = a * b +2

Pregunta 159

Pregunta
Choose the correct formula for computing C2 in Elgamal cryptography
Respuesta
  • C2 = KM mod q
  • C = MK
  • C3 = AK
  • C4 = AA

Pregunta 160

Pregunta
In Elgamal cryptography public key cryptosystem related to D-H
Respuesta
  • True
  • False

Pregunta 161

Pregunta
Known plaintext is...
Respuesta
  • attacker knows suspects plaintext/ciphertext
  • only know algorithm & ciphertext, is statistical, must know or be able to identify plaintext
  • attacker selects plaintext and gets ciphertext
  • attacker selects ciphertext and gets plaintext
  • Attacker selects plaintext or ciphertext to en/decrypt

Pregunta 162

Pregunta
Chosen plaintext is...
Respuesta
  • attacker knows suspects plaintext/ciphertext
  • only know algorithm & ciphertext, is statistical, must know or be able to identify plaintext
  • attacker selects plaintext and gets ciphertext
  • attacker selects ciphertext and gets plaintext
  • Attacker selects plaintext or ciphertext to en/decrypt

Pregunta 163

Pregunta
Chosen ciphertext is...
Respuesta
  • attacker knows suspects plaintext/ciphertext
  • only know algorithm & ciphertext, is statistical, must know or be able to identify plaintext
  • attacker selects plaintext and gets ciphertext
  • attacker selects ciphertext and gets plaintext
  • Attacker selects plaintext or ciphertext to en/decrypt

Pregunta 164

Pregunta
Chosen text is ...
Respuesta
  • attacker knows suspects plaintext/ciphertext
  • only know algorithm & ciphertext, is statistical, must know or be able to identify plaintext
  • attacker selects plaintext and gets ciphertext
  • attacker selects ciphertext and gets plaintext
  • attacker selects plaintext or ciphertext to en/decrypt
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