Test
oku_kerek_tagy_byr_ret
Preguntas del test (113)
1A message is authentic and digitally signed if sent with:
- Aa message digest/hash encrypted with the receiver’s public key
- Ba message digest/hash encrypted with the receiver’s private key
- Ca message digest/hash encrypted with the sender’s public key
- Da message digest/hash encrypted with the sender’s private key
2Which of the following issues is not addressed by Kerberos:
- Aavailability.
- Bprivacy.
- Cintegrity.
- Dauthentication.
3In Asymmetric-Key Cryptography, two keys, e and d, have a special relationship to
- AOthers
- BData
- CKeys
- DEach other
4Substitutional cipers are
- AMonoalphabatic
- BSemialphabetic
- CPolyalphabetic
- DNone of the above
- EBoth monoalphabatic and polyalphabetic
5Heart of Data Encryption Standard (DES), is the
- ACipher
- BRounds
- CEncryption
- DDES function
6DES stands for
- AData Encryption Standard
- BData Encryption Subscription
- CData Encryption Solutions
- DData Encryption Slots
7In symmetric key cryptography, key used by sender and receiver is
- AShared
- BDifferent
- Ctwo keys are used
- DNone
8In symmetric-key cryptography, key(s) used for encryption and decryption is/are
- ASame
- BDifferent
- CPrivate
- DPublic
9Keys used in cryptography are
- Asecret key
- Bprivate key
- Cpublic key
- DAll of them
- ENone of them
10Cryptography can provide
- Aentity authentication
- Bnonrepudiation of messages
- Cconfidentiality
- DNone of them
- EAll of them
11Advanced Encryption Standard (AES), has three different configurations with respect to number of rounds and
- AData Size
- BRound Size
- CKey Size
- DEncryption Size
12Cryptography algorithms (ciphers) are divided into
- Atwo groups
- Bfour groups
- Cone single group
- DNone
13In Cryptography, original message, before being transformed, is called
- ASimpletext
- BPlaintext
- CEmptytext
- DFilledtext
14SHA-l has a message digest of
- A160 bits
- B512 bits
- C628 bits
- D820 bits
15A hash function guarantees integrity of a message. It guarantees that message has not be
- AReplaced
- BOver view
- CChanged
- DLeft
16To check integrity of a message, or document, receiver creates the
- ACipher text
- BHash
- CHyper Text
- DFinger Print
17A digital signature needs a
- Aprivate-key
- Bshared-key
- Cpublic-key
- DAll of them
- ENone of them
18Encryption and decryption provide secrecy, or confidentiality, but not
- AAuthentication
- BIntegrity
- CKeys
- DFrames
- EConfidentiality
19When data must arrive at receiver exactly as they were sent, it is called
- AMessage Confidentiality
- BMessage Integrity
- CMessage Splashing
- DMessage Sending
20In Message Integrity, SHA-l hash algorithms create an N-bit message digest out of a message of
- A512 Bit Blocks
- B1023 Bit Blocks
- C1001 Bit Blocks
- D1510 Bit Blocks
- E2024 Bit Blocks
21Message privacy means that sender and receiver expect
- AIntegrity
- BConfidentiality
- CAuthentication
- DNonrepudiation
22Message must be encrypted at sender site and decrypted at the
- ASender Site
- BSite
- CReceiver site
- DConferencing
23In Asymmetric-Key Cryptography, although RSA can be used to encrypt and decrypt actual messages, it is very slow if message is
- AShort
- BHuge
- CComplex
- DThin
- ENone of them
24An encryption algorithm transforms plaintext into
- ACipher text
- BSimple Text
- CPlain Text
- DEmpty Text
25A transposition cipher reorders (permutes) symbols in a
- Ablock of packets
- Bblock of slots
- Cblock of signals
- Dblock of symbols
26Ciphers of today are called round ciphers because they involve
- ASingle Round
- BDouble Rounds
- CMultiple Round
- DRound about
27RSA stands for
- ARivest, Shamir, Adleman
- BRoger, Shamir, Adrian
- CRobert, Shamir, Anthoney
- DRivest, Shaw, Adleman
28_______ is the science and art of transforming messages to make them secure and immune to attacks.
- ACryptography
- BCryptoanalysis
- CCrypt
- DEncryption
- ENone of them
29The _______ is a number or a set of numbers on which the cipher operates.
- Acipher
- Bnonce
- Csecret
- Dkey
- Enone of the above
30In a(n) ________ cipher, the same key is used by both the sender and receiver.
- Asymmetric-key
- Basymmetric-key
- CPublic-key cryptography
- DRSA algorithm
- ENone of them
31In a(n) ________, the key is called the secret key.
- Asymmetric-key
- Basymmetric-key
- CPublic-key cryptography
- DAll of them
- ENone of them
32In a(n) ________ cipher, a pair of keys is used
- Asymmetric-key
- Basymmetric-key
- CPrivate-key cryptography
- DDES algorithm
33The Caesar cipher is a _______cipher that has a key of 3.
- Atransposition
- Badditive
- Casymmetric
- Dsubstitution
- Enone of the above
34The ________ cipher reorders the plaintext characters to create a ciphertext.
- Atransposition
- Badditive
- Casymmetric
- Dsubstitution
- Eshift
35A(n) ______ is a keyless substitution cipher with N inputs and M outputs that uses a formula to define the relationship between the input stream and the output stream.
- AS-box
- BP-box
- CT-box
- Dnone of the above
- ESP-boxes
36A(n) _______is a keyless transposition cipher with N inputs and M outputs that uses a table to define the relationship between the input stream and the output stream.
- AS-box
- BP-box
- CT-box
- Dnone of the above
- ESP-boxes
37DES is a(n) ________ method adopted by the U.S. government.
- Asymmetric-key
- Basymmetric-key
- Cdecryption
- Dencryption
- ENone of them
38DES has an initial and final permutation block and _________ rounds.
- A14
- B15
- C12
- D16
- Enone of the above
39DES uses a key generator to generate sixteen _______ round keys.
- A32-bit
- B48-bit
- C56-bit
- D42-bit
- E64-bit
40AES has _____ different configurations
- Atwo
- Bthree
- Cfour
- Dfive
- EAES has no configurations
41One commonly used public-key cryptography method is the ______ algorithm.
- ARSS
- BRAS
- CRSA
- DRAA
- EDSS
42The ________ method provides a one-time session key for two parties.
- ADiffie-Hellman
- BRSA
- CDES
- DAES
- EDSA
43In symmetric cryptography, which of the following MUST be true:
- AThe same key is used for encryption and decryption
- BEncryption and decryption take the same amount of time
- CDifferent algorithms are used for encryption and decryption
- DCryptographic operations are one‐way, and not reversible
44Message _____ means that the data must arrive at the receiver exactly as sent.
- Aconfidentiality
- Bintegrity
- Cauthentication
- Davailability
- Enone of the above
45Message _______ means that the receiver is ensured that the message is coming from the intended sender, not an imposter.
- Aconfidentiality
- Bintegrity
- Cavailability
- Dauthentication
- Enone of the above
46________ means to prove the identity of the entity that tries to access the system's resources.
- AMessage authentication
- BEntity authentication
- CMessage confidentiality
- DMessage integrity
- Enone of the above
47Digital signature cannot provide ________ for the message.
- Aintegrity
- Bconfidentiality
- Cnonrepudiation
- Dauthentication
- Eavailability
48Challenge-response authentication can be done using ________.
- Asymmetric-key ciphers
- Basymmetric-key ciphers
- Ckeyed hash function
- Dkeyless hash function
- Eall of the above
49A digital signature needs a(n)_________ system.
- Asymmetric-key
- Basymmetric-key
- Cboth symmetric- and asymmetric-key cryptography
- DNone of the above
50The _______ criterion states that it must be extremely difficult or impossible to create the message if the message digest is given.
- Aone-way property
- Bcollision-free property
- Cboth one-way and collision-free properties
- Dnone of the above
51Making sure that the data has not been changed unintentionally, due to an accident or malice, is:
- AAuditability
- BConfidentiality
- CIntegrity
- DAvailability
- EIdentity
52I have a company’s documents which are proprietary and a trade secret. How do I protect them from getting stolen?
- ADigitally sign the documents
- BEncrypt them using RSA or AES
- CHash the data
- DUse decryption
- ENone of them
53Biometrics represents:
- ASomething you know
- BSomething you have
- CSomething you are
- DAll of the above
- ENone of the above
54In asymmetric encryption
- Asame key is used for encryption and decryption
- Bdifferent keys are used encryption and decryption
- Cno key is required for encryption and decryption
- Dnone of the mentioned
55The sender “signs” a message as:
- ADigital Signature
- BArtificial Signature
- CEncrypted Signature
- DNone of the above
56In encryption:
- APublic key is used
- BPrivate key is used
- CBoth public and private keys are used
- DNone of the above
57AES stands for:
- AAdvanced Encryption Standard
- BAdvanced Encryption System
- CAdvanced Encryption Suggestion
- DNone of the above
58Authentication is:
- AVerification of user’s identification
- BVerification of the data
- CAll answers are correct
- DNo correct answer
59The process to discover plaintext or key is known as
- ACryptanalysis
- BCryptography
- CCrypto design
- DCrypto processing
- ECryptology
60Output message in cryptography is called:
- APlaintext
- BCiphertext
- CRaw text
- DNone of the above
61Input message in cryptography is called:
- APlaintext
- BCiphertext
- CEncrypted text
- DNone of the above
62In cryptography
- AInformation is transmitted from sender to receiver
- BNo information is transmitted
- CInformation is damaged
- DNo correct answer
63Secure hash algorithm(SHA) developed by:
- ANational Institute of Standards and Technology (NIST) or NSA
- BIEEE
- CANSI
- DNone of the above
64Conventional encryption is:
- ASymmetric encryption
- BSecret key encryption
- CSingle key encryption
- DAll of the above
65In network security:
- AData is protected from hackers
- BData is protected from cracker
- CBoth answers are possible
- DNone of the above
66DSS stands for:
- ADigital signature standard
- BDigital sound system
- CDigital simulation schemes
- DNone of these
67Cryptography ensures:
- AConfidentiality of data
- BAuthentication of data
- CIntegrity of data
- DAll of the above
68In network security:
- AData is protected during transmission
- BData is not protected during transmission
- CData is changed
- DNone of the above
69Network security ensures:
- ADetecting attacks
- BPreventing attacks
- CRecovering attacks
- DAll of the above
70Encryption protects against:
- AAttacks
- BViruses
- CManipulation of data
- DAll of the above
71Authentication refers to:
- AVerification of user’s identity
- BChecking user’s privileges
- CAuditing user’s process
- DNone of the above
72The message is decrypted at ________ - side
- AReceiver
- BSender
- CBroker
- DAttacker
- EAll of the above
73Cryptography relates to ______
- AEditing
- BSecurity
- CTesting
- DAll of the above
74Which of the following is not used for symmetric encryption?
- ARSA
- BDES
- CSHAI
- DRC4
- EMD5
75Finding plaintext, without knowing key is know as:
- ACryptography
- BCryptanalysis
- CCryptology
- DNone of the above
76Which of the following is a transposition cipher?
- ACaesar cipher
- BVigenere cipher
- COne time pad
- DPlayfair cipher
77Which of the following is a monoalphabetic cipher?
- ACaesar Cipher
- BLucifier cipher
- CPlayfair cipher
- DNo correct answer
78RSA involves very large _____ numbers.
- APrime
- BEven
- COdd
- DAny random
79Cryptology means
- ACryptography + Cryptodesign
- BCryptography + Cryptanalysis
- CCryptography itself known as cryptology also
- DNone of the above
80Diffie-Hellman key exchange is vulnerable to:
- ADiscrete logarithmic problem
- BElliptic curve cryptography
- CMan-in-the-middle attack
81None of these Which of the following is an example of a passive attack?
- AModify
- BDenial of Service (DoS)
- CMasquerade
- DTraffic analysis
82Which kind of service ensures that a message was received from the actual sender not from an attacker?
- AConfidentiality
- BAccess Control
- CIntegrity
- DNon-repudiation
- EAuthentication
83Which of the following is an active attack? I. Release of message contents; II. Traffic analysis; III. Modify; IV. Denial of Service
- AI and II
- BI and III
- CIII and IV
- DII and IV
- EI, III and IV
84The method of hiding the secret is called
- ACryptography
- BWatermarking
- CCryptanalysis
- DSteganography
85It is the art of breaking the cipher
- ACryptanalysis
- BWatermarking
- CCryptography
- DSteganography
86The field which deals with _____ called cryptography
- AKeys
- BEncryption techniques and secure systems
- CFirewalls, Kerberos and Intrusion detection systems
- DOperating systems
87What would be the number of rounds in AES, if the key size is 24 bytes?
- A10
- B12
- C14
- D26
88What would be the number of rounds in AES, if the key size is 32 bytes?
- A10
- B12
- C14
- D16
89Which of the following step is absent in the last round of AES?
- AShift row
- BMix columns
- CByte substitution
- DAdd subkey
90DES algorithm uses total ______ subkeys
- A10
- B12
- C14
- D16
- E24
91The total number of rounds in DES algorithm.
- A10
- B12
- C14
- D16
- E24
92Which of the following method provides a one-time session key for two parties?
- ADiffie-Hellman
- BRSA
- CDES
- DAES
93What is the size of round key for DES algorithm?
- A32-bit
- B48-bit
- C64-bit
- D128-bit
94What is the purpose of access control list?
- Ato enforce a specified security policy
- Bto prevent unauthorised access to data
- Cto emphasize encryption
- Dit is a key distribution center
95Define a subject of Access Control List
- Aan active entity requesting for resource access
- Ba passive entity and target of the protection
- Can access control decision function
- Dan access control information function
96Define an object of Access Control List
- Aan active entity requesting for resource access
- Ba passive entity and target of the protection
- Can access control decision function
- Dan access control information function
97What does multilevel security mean?
- AClassification of information by the level of importance and permission of access by users with different security clearance
- BClassification of information by date and permission of access by users with different security clearance
- CClassification of information by the level of importance and permission of access by users name
- DClassification of information by date and permission of access by users name
98How many levels are covered in multilevel security
- A1
- B2
- C3
- D4
99No read up (read down) means
- AA subject can only read an object of less or equal security level
- BA subject can only write into an object of greater or equal security level
- CA subject can only read an object of more or equal security level
- DA subject can only write into an object of less or equal security level
100No write down (write up) means
- AA subject can only read an object of less or equal security level
- BA subject can only write into an object of greater or equal security level
- CA subject can only read an object of more or equal security level
- DA subject can only write into an object of less or equal security level
101What does “computationally infeasible to find data mapping to specific hash” mean?
- AOne way property
- BCollision free property
- CSecond way property
- DCollision property
102Which of the following is not property of hash functions?
- AOne wayness
- BPreimage resistance
- CStrong collision resistance
- DLong, unfixed output
103The purpose of hash function is to
- ACreate a message
- BCompress a message
- CDivide a message
- DConquer a message
104Which of the following refers requirement of digital signature?
- AMust be relatively hard to produce
- BMust be relatively hard to recognize
- CMust depend on the message verified
- DMust to be computationally infeasible to forge
105Which of the following refers requirement of digital signature?
- AMust be relatively hard to produce
- BMust be relatively hard to recognize
- CMust depend on the message verified
- DMust to be practical to save digital signature in storage
106What is the property of direct digital signature?
- AAssumed receiver has sender’s private key
- BInvolves only sender
- CCan encrypt using receiver’s public key
- DAssumed sender has receiver’s private key
107Define AAA.
- AAccess After Anyone
- BAuthentication Authorization Accounting
- CAuthentication Authorization Access
- DAuthentication Access Accounting
108Which of the term refers to authorization?
- AThe user identity is a parameter in access control decisions
- BThe user identity is recorded when logging security
- CThe process of verifying a claimed identity
- DAccounting of service
109Which of the term refers to accounting?
- AThe user identity is a parameter in access control decisions
- BThe user identity is recorded when logging security
- CThe process of verifying a claimed identity
110Define X.509
- ATTP certifies trustworthiness of binding public key with its rightful owner’s identity
- BTTP certifies trustworthiness of binding private key with its rightful owner’s identity
- CTo enable the validation and to give legal meaning to digital signature
- DAnswers for supporting encryption/decryption algorithms
111Define a Kerberos
- ATrusted third party authentication system and makes no use of public key cryptography
- BTTP certifies trustworthiness of binding private key with its rightful owner’s identity
- CTo enable the validation and to give legal meaning to digital signature
- DAnswers for supporting encryption/decryption algorithms
112Which of the following does not refer for Kerberos property
- AImpeccability
- BContainment
- CTransparency
- DViciousness
113How BruteForce works
- Aаttаckеr triеs еvеry possiblе combinаtion of chаrаctеrs
- BInstall viruses
- CAttacker sends more data to an application than is expected
- DAttacker knows of a security problem within an operating system or a piece of software and leverages that knowledge by exploiting the vulnerability
Información
- Descripción
- Computer Science Test sobre oku_kerek_tagy_byr_ret, creado por Daniyar Adilkhanov el 17/05/2018.
- Autor
- Daniyar Adilkhanov
- Idioma
- English
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- Etiquetas
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