Quiz
Information security and data protection
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Perguntas do quiz (164)
1What 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
2Identify definition of authentication
- Aestablishes the identity of a subject
- Bspecifies and enforces that each object is accessed correctly and only by those that are allowed to do so
- Cto enforce a specified security policy
- Dto emphasize encryption
3What does Access Control Information cover?
- Adata, resources
- BAC policy
- Cfunctions such as grant, deny
- Ddecisions
4What does Access Control Enforcement cover?
- Adata, resources
- BAC policy
- Cfunctions such as grant, deny
- Ddecisions
5What does Access Control Decision Function cover?
- Adata, resources
- BAC policy
- Cgranting and denying access
- Ddecisions
6Define 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
7Define 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
8How many types of resource dependent access controls exist?
- A1
- B2
- C3
- D4
9How many types of access control mechanisms exist
- A1
- B2
- C3
- D4
10Find an example of resource dependent access for network access
- Aappend
- Bexecute
- Credirected
- Dgranted
11Find an example of resource dependent access for file access
- Aappend
- Bexecute
- Credirected
- Dgranted
12Find incorrect access control goal
- Ainvalid operations should be permitted
- Bevery actions should be checked
- Cunnecessary access should not be allowed
- Dall the above mentioned
13What is a property of the capability ticket in access control list?
- ASpecifies a given subject can perform what operations on what objects
- BSubjects does not grant rights to other subjects
- CUsers have only one ticket
- DAccess rights given to a subject are valid for forever
14What is a property of the procedure oriented objects in access control list?
- AObjects are encapsulated, permitting only certain specified accesses via program execution
- BSpecifies a given subject can perform what operations on what objects
- CAccess rights given to a subject are valid for forever
- DUsers have only one ticket
15What is a property of the procedure oriented objects in access control list?
- AEnforces accesses to an object be done through a trusted interface
- BSpecifies a given subject can perform what operations on what objects
- CAccess rights given to a subject are valid for forever
- DUsers have only one ticket
16What 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
17How many levels are covered in multilevel security
- A1
- B2
- C3
- D4
18No 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
19No 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
20Define a malware attacks
- AMalicious software causes data compromises
- BA browser helper object that detects changes to URL and logs
- CUsers are tricked by fraudulent messages into giving out information
- DThe lookup of host names is altered to send users to a fraudulent server
21How many types of authentication schemes exist?
- A1
- B2
- C3
- D4
22Define a change cipher spec
- AAll data sent/received by software that uses SSL
- Bused to carry handshake messages
- Cused to indicates a change in the encryption and authentication of records
- Dused to indicate when the connection is about to close
23Define an alert
- AAll data sent/received by software that uses SSL
- Bused to carry handshake messages
- Cused to indicates a change in the encryption and authentication of records
- Dused to indicate when the connection is about to close
24Which of the following is true about importance of hash functions i. High Computational Load ii. Message Overhead iii. Security Limitations
- Ai only
- Bnone
- CAll the mentioned
- Diii only
25What does “computationally infeasible to find data mapping to specific hash” mean
- AOne way property
- BCollision free property
- CSecond way property
- DCollision property
26Which of the following is not property of hash functions?
- AOne wayness
- BPreimage resistance
- CStrong collision resistance
- DLong, unfixed output
27How many types of hash constructions exist?
- A1
- B2
- C3
- D4
28Output length for SHA-1
- A128
- B160
- C512
- D314
29Input length for SHA-1
- A512
- B2014
- C160
- D314
30Which construction method support SHA?
- ASchnorr
- BDiffie-Hellman
- CMerkle-Damgard
- DAlice & Bob
31How many rounds in general hold SHA-1?
- A50
- B60
- C70
- D80
32How many stages hold SHA-1?
- A1
- B2
- C3
- D4
33How many rounds support one stage?
- A10
- B20
- C80
- D79
34Name of the function that SHA-1 use
- AMerkle-Damgard
- BFeistel
- CSchnorr
- DDiffie-Hellman
35How many types of SHA exist ?
- A1
- B2
- C3
- D4
36How many rounds MD5 hold in general?
- A64
- B80
- C512
- D160
37Which of the following does not refer to security requirements of Hash functions?
- APreimage resistance
- BSecond preimage resistance
- CCollision resistance
- DHigh Computational Load
38The purpose of hash function is to
- ACreate a message
- BCompress a message
- CDivide a message
- DConquer a message
39How many constant keys support SHA algorithm ?
- A1
- B2
- C3
- D4
40Which 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
41Which 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
42What 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
43Which of the following does not refer to characteristics of digital signature?
- APrivate/public is generated by receiver
- BA durable private/public key pair
- CA disposable private/public key pair
- DSignature is two numbers, depending on message hash and secret information
44How many message authentication functions exist?
- A1
- B2
- C3
- D4
45If public key encryption is used
- AEncryption provides no confidence of sender
- BEncryption provides with some level of confidence of sender
- CEncryption provides fully confidence of sender
- DEncryption does not provided at all
46In public key cryptography sender signs message using their
- APublic key
- BShared key
- CPrivate key
- DThird key
47In public key cryptography sender signs message using their private key, then encrypts with recipient’s
- APrivate key
- BPublic key
- CSingle key
- DKey
48What is authentication?
- AThe process of verifying a claimed identity
- BIdentification of user
- CAccess control
- DAccounting of service
49Define AAA.(triple A)
- AAccess After Anyone
- BAuthentication Authorization Accounting
- CAuthentication Authorization Access
- DAuthentication Access Accounting
50Which 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
51Which 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
- DAccounting of service
52PIN, passwords refer to
- ASomething you have
- BSomething you know
- CSomething you are
- DCombined method
53Keys, soft tokens refer to
- ASomething you have
- BSomething you know
- CSomething you are
- DCombined method
54Fingerprint, iris, palm recognition refer to
- ASomething you have
- BSomething you know
- CSomething you are
- DCombined method
55Combined or multiple methods of authentication are used for
- ALower level assurance
- BMedium level assurance
- CHigher level assurance
- DNot used at all
56How many phases are exist in biometric?
- A1
- B2
- C3
- D4
57When fingerprint was developed?
- A1988
- B1888
- C1887
- D1987
58What is minutia ?
- ATime
- Bcomparisons of one print with another can be made
- Ccomparison of eyes
- Dcomparison of palms
59What is TTP?
- 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
- CTo enable the validation and to give legal meaning to digital signature
- DAnswers for supporting encryption/decryption algorithms
60Define 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
61Define 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
62Which of the following does not refer for Kerberos property
- AImpeccability
- BContainment
- CTransparency
- DViciousness
- EПодписываемся на мой инстаграм @beketoo
63What is a security?
- AThe protection of information assets through the use of technology, processes, and training
- BThe presence of weaknesses or loopholes in systems which may lead (systematically) to cyber attacks
- COccurs when a system is compromised based on a vulnerability by an unknown exploit
- DEnsures that computer-related assets are accessed only by authorized parties
64What is a vulnerability?
- AThe protection of information assets through the use of technology, processes, and training
- BThe presence of weaknesses or loopholes in systems which may lead (systematically) to cyber attack
- COccurs when a system is compromised based on a vulnerability by an unknown exploit
- DEnsures that computer-related assets are accessed only by authorized parties
65What is an attack?
- AThe protection of information assets through the use of technology, processes, and training
- BWritten 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
- CThe presence of weaknesses or loopholes in systems which may lead (systematically) to cyber attacks.
- DOccurs when a system is compromised based on a vulnerability by an unknown exploit
66Types of Threats
- AInterception, Interruption, Modification, Fabrication
- BMethod, Opportunity, Motive
- CConfidentiality, Integrity, Availability, Authentication
- DNon-repudiation, Authorisation/Access control, Destruction
67How to protect?
- AEncryption, Software control, Hardware control, Policies and Procedures,Physical control
- BMethod, Opportunity, Motive
- CConfidentiality, Integrity, Availability, Authentication
- DNon-repudiation, Authorisation/Access control, Destruction
68Interception is __
- AAsset lost, unusable,unavailable
- BUnauthorized access
- CUnauthorized change, tamper of data
- DEx. Unauthorized add data to a DB
69Security goals are:
- ACIA
- BCEA
- CCLA
- DCDD
70Confidentiality means
- Amessages exchanged across network remains private
- Bcontents of messages are not modified while in transit
- Cdetermining the identity of entities involved in message exchanges
- Ddetermining the resources that an entities are allowed to access and in what manner
71Deterrence is
- APunishment makes attackers think twice –Examples include laws and organisational policy
- BReduce likelihood and save cost of incidents ◦ ( Ex.: Firewalls, router access control list, spam filters, virus scanners)
- CNeed alert if breach occurs –Collection of evidence ◦ ( ex.: Audit logs, intrusion detection system, network traffic monitoring)
- DPunishment by taking money
72Defence is
- APunishment makes attackers think twice –Examples include laws and organisational policy
- BReduce likelihood and save cost of incidents ◦ ( Ex.: Firewalls, router access control list, spam filters, virus scanners)
- CNeed alert if breach occurs –Collection of evidence ◦ ( ex.: Audit logs, intrusion detection system, network traffic monitoring)
- DPunishment by taking money
73Detection is
- APunishment makes attackers think twice –Examples include laws and organisational policy
- BReduce likelihood and save cost of incidents ◦ ( Ex.: Firewalls, router access control list, spam filters, virus scanners)
- CNeed alert if breach occurs –Collection of evidence ◦ ( ex.: Audit logs, intrusion detection system, network traffic monitoring)
- DPunishment by taking money
74Integrity means
- Amessages exchanged across network remains private
- Bcontents of messages are not modified while in transit
- Cdetermining the identity of entities involved in message exchanges
- Ddetermining the resources that an entities are allowed to access and in what manner
75Authentication means
- Amessages exchanged across network remains private
- Bcontents of messages are not modified while in transit
- Cdetermining the identity of entities involved in message exchanges
- Ddetermining the resources that an entities are allowed to access and in what manner
76Non-repudiation means
- Amessages exchanged across network remains private
- Bcontents of messages are not modified while in transit
- Cdetermining the identity of entities involved in message exchanges
- Densures that parties cannot deny having sent messages
77DES stands for
- ADemand Encryption Standard
- BData Encryption Standard
- CDigital Encryption Standard
- DDatabase Encryption Standard
78When DES released?
- A1977
- B1974
- C1960
- D1965
79Who introduced idea of substitution-permutation (S-P) networks?
- AShannon
- BFeistal
- CLucifer
- DRijndael
80In how many rounds DES encryption is handled?
- A16
- B8
- C32
- D4
81_____ process messages in blocks, each of which is then encrypted/decrypted?
- Ablock ciphers
- Bstream ciphers
- Cmode ciphers
- Dcode ciphers
82What is the cryptography?
- Astudy about how hacker should behave
- Bstudy of encryption principles/methods
- Cstudy about message transformation
- Dstudy of the computer system
83Which cipher is described below: “Each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.”
- APlayfair Cipher
- BVigenere Cipher
- CCaesar Cipher
- DKerberos
84How Cryptography is divided by the way in which plaintext is processed:
- ASubstitution and Transposition
- BSingle-key or Private key
- CTwo- key or Public
- DBlock and Stream
85What is the Key Matrix size in Playfair
- A3x3
- B4x4
- C5x5
- D9x9
86Using the Caesar cipher decrypt this message “Vwdb kxqjub, vwdb irrolvk” (key=2)
- AStay hungry, stay foolish
- BNever give up
- CDance as if no one sees
- DWith the great power comes great responsibility
873 Ds of Security: (DDD)
- ADefence, Deterrence, Detection
- BData, Development, Device
- CDatabase, Data, Deadline
- DDemand, Design, Decision
88MOM stands for ____
- AMethod, Opportunity, Motive
- BModification, Operation, Motto
- CMalfunction, Opinion, Management
- DMessages, Opportunity, Monitoring
89DES is a symmetric cipher
- AVerdadeiro
- BFalso
90Block size of DES
- A256-bits
- B128-bits
- C64-bits
- D32-bits
91AES stands for
- AAdvanced Encryption Standard
- BAdvanced Encryption System
- CAmerican Encryption Standard
- DAlias Encryption Standard
92Advanced Encryption Standard(AES) also known like
- ARassul
- BRijndael
- CFeistel
93Who introduce idea of substitution-permutation?
- ADavid Shannon
- BAndre Shannon
- CPetre Shannon
- DClaude Shannon
94In which year was introduced idea of substitution-permutation?
- A1949
- B1948
- C1950
- D1951
95What is the plaintext?
- AOriginal Message
- BCoded Message
- CAlgorithm for transforming text
- DSecret key
96What is not the model of the symmetric cipher?
- Aconventional / private-key / single-key
- Bsender and recipient share a common key
- Call classical encryption algorithms are private-key
- Dwas only type prior to invention of public- key in 1982’s
97What is the Cipher ?
- Aalgorithm for transforming plaintext to ciphertext
- Bcoded message
- Coriginal message
- Dstudy of encryption principles/methods
98What is the cryptanalysis (codebreaking ) ?
- Aalgorithm for transforming plaintext to cipher text
- Bstudy of principles/methods of deciphering cipher text without knowing key
- Coriginal message
- Dstudy of encryption principles/methods
99What is the cryptology?
- Afield of both cryptography & cryptanalysis
- Boriginal message
- Cstudy of encryption principles/methods
- Dalgorithm for transforming plaintext to cipher text
100What are the general approaches for Cryptanalysis?
- Acryptanalytic attack/brute force attack
- Bsubstitution/transposition
- Cpermutation/transposition
- Dsubstitution/permutation
101What is Ciphertext only?
- Aattacker knows suspects plaintext/ciphertext
- Bonly know algorithm & ciphertext, is statistical, must know or be able to identify plaintext
- Cattacker selects plaintext and gets ciphertext
- Dattacker selects ciphertext and gets plaintext
102How many types of threats exist?
- A1
- B2
- C3
- D4
103Authorisation means
- Amessages exchanged across network remains private
- Bcontents of messages are not modified while in transit
- Cdefining the identity of entities involved in message exchanges
- Ddetermining the resources that an entities are allowed to access and in what manner
104CIA means
- AConfidentiality, invalid, availability
- BConfidentiality, interact, access
- CCertain, integrity,availability
- DConfidentiality, integrity, availability
105What is Threat?
- AThe 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
- BTypical threats include unauthorised access, destruction, system overrun and takeover, propagation of malicious code, data thieving and fabrication;
- CWritten 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
- DOccurs when a system is compromised based on a vulnerability by an unknown exploit
106What is ciphertext?
- Acoded message
- Boriginal message
- Calgorithm for transforming plaintext to ciphertext
- Dinfo used in cipher known only to sender/receiver
107What is a key?
- Aconverting plaintext to ciphertext
- Brecovering ciphertext from
- Cinfo used in cipher known only to sender/receiver
- Dalgorithm for transforming plaintext to ciphertext
108What is encipher (encrypt)?
- Astudy of encryption principles/methods
- Bstudy of principles/ methods of deciphering ciphertext without knowing key
- Coriginal message
- Dconverting plaintext to ciphertext
109What is decipher (decrypt)?
- Aconverting plaintext to ciphertext
- Brecovering ciphertext from plaintext
- Ccoded message
- Doriginal message
- Erecovering plaintext from ciphertext
110Mostly used symmetric cipher
- AAES
- BDES
- CRSA
- DSHA-1
111Possible length of AES key
- A128 156 198
- B128 192 256
- C128 184 228
- D128 164 256
112How many stages has final round of AES?
- A1
- B2
- C3
- D4
113RSA uses
- Atwo keys - private & publiс
- Bone key - only private
- Cone key - only public
- Dno correct answer
114What is TRUE about RSA? Each user generates a public/private key pair by:
- Aselecting two large primes at random: p, q
- Bselecting two small primes at random: p, q
- Cselecting three large primes at random: p, q, r
- Dselecting only one number at random: p
115In RSA security relies on a ___ difference in difficulty between ___ (en/decrypt) and ___ (cryptanalyse) problems
- Alarge enough, easy, hard
- Bsmall enough, hard, easy
- Csmall enough, easy, hard
- Dlarge enough, hard, easy
116Advanced Encryption Standard (AES), has three different configurations with respect to number of rounds and
- AData Size
- BRound Size
- CKey Size
- DEncryption Size
117_______ is a round cipher based on the Rijndael algorithm that uses a 128-bit block of data.
- ARSA
- BKarberos
- CCaesar
- DAES
118In asymmetric key cryptography, the private key is kept by
- Asender
- Breceiver
- Csender and receiver
- Dall the connected devices to the network
- Enone of these
119RSA was developed by:
- ADr.Tahir El-Gamal
- BDiffie-Hellman
- CShannon
- DRivest, Shamir, Adleman
120Encryption by receiver with sender’s public key:
- AC = Me mod N
- BM=Cd mod N
- CYa=Xa mod Q
- DC=Km mod Q
121RSA was founded in:
- A1975
- B1976
- C1977
- D1974
122Decryption by sender with sender’s public key:
- AC=Me mod N
- BM=Cd mod N
- CYa=Xa mod Q
- DC=Km mod Q
123Calculate n and φ, if p = 3, and q = 11 (RSA)
- An = 33, φ = 20
- Bn = 20, φ = 33
- Cn = 33, φ = 33
- Dn = 33, φ = 22
124Calculate n and φ, if p = 17, and q = 11 (RSA)
- An = 187, φ = 160
- Bn = 160, φ = 187
- Cn = 187, φ = 187
- Dn = 187, φ = 170
125Calculate C (ciphertext), if p = 3, q = 11, e = 7, M = 2 (RSA)
- AC = 29
- BC = 3
- CC = 22
- DC = 2
126Calculate M (plaintext), if p = 3, q = 11, d = 3, C = 29 (RSA)
- AM = 2
- BM = 29
- CM = 30
- DM = 1
127Block size of AES plaintext:
- A192
- B164
- C128
- D256
128Maximum AES number of rounds:
- A10
- B12
- C14
- D16
129AES size of output(output parameter):
- A192
- B128
- C164
- D256
130First public-key type scheme proposed by Diffie & Hellman in
- A1971
- B1976
- C1981
- D1986
131Value of key depends on the: (Diffie & Hellman)
- AParticipants
- BKeys
- CMessage
- DAlgorithm
132If Alice and Bob subsequently communicate, they will have the____ key
- ASame
- BDifferent
- CPrivate
- DPublic
133Which of these are true about “a public-key distribution scheme ”?
- Acannot be used to exchange an arbitrary message
- Brather it can establish a common key
- Cknown only to the two participants
- Dall of above
134When by Diffie & Hellman along with the exposition of public key concepts?
- A1977
- B1978
- C1979
- Dnone of them
135Which of them uses two keys( public and private):
- ARSA
- BCaesar
- CVigenere
- DPlayfair
136A related private-key, known
- Aonly to the recipient
- Bonly to the sender
- Cnone of them
- Dto everyone
137The key must be kept secret for
- Aneeded security
- Bencryption and decryption
- Cencryption
- Ddecryption
138The _________ attack can endanger the security of the Diffie-Hellman method if two parties are not authenticated to each other.
- Aman-in-the-middle
- Bciphertext attack
- Cplaintext attack
- Dnone of the above
139“Using only a subset of letters/words in a longer message marked in some way ” is__
- ACaesar Cipher
- BRSA
- CDES
- DSteganography
140For which cipher an example is given: “Say hi to IITU” After encrypt “Yas ih ot UTII”
- APlayfair Cipher
- BTransposition Cipher
- CRoute Cipher
- DSteganography
141Polyalphabetic substitution ciphers improve security using multiple cipher alphabets
- AVerdadeiro
- BFalso
142For RSA to work, value of P must be less than value of:
- AP
- BQ
- Cn
- Dr
143In symmetric key cryptography, key used by sender and receiver is:
- Ashаrеd
- BDifferent
- CTwo keys are used
- DNone
144In symmetric-key cryptography, same key is used by:
- AOne Party
- BMulti Party
- CThird Party
- DBoth Party
145RSA stands for
- ARivеst, Shаmir,, Аdlеmаn
- BRoger, Shamir, Adrian
- CRobert, Shamir, Anthoney
- DRivest, Shaw, Adleman
146Which of them is first public-key type scheme?
- ADiffiе & Hеllmаn
- BElgamal
- CRSA
- DAES
147When Diffie & Hellman protocol was invented?
- A1976
- B1975
- C1980
- D1990
148In Diffie & Hellman key exchange a public key is known only to the two participants
- AVerdadeiro
- BFalso
149In Diffie & Hellman key exchange a public key is cannot be used to exchange an arbitrary message
- AVerdadeiro
- BFalso
150Diffie & Hellman key exchange based on exponentiation in a finite (Galois) fields
- AVerdadeiro
- BFalso
151In Diffie & Hellman protocol when the user A generates their key a secret key should be
- AXА < q
- Bgenerated randomly
- Cgiven by user B
- Dnone
152Choose the correct formula for computing public key YA in Diffie & Hellman protocol
- AYА= а mod q
- BBA = a + b
- CCA = a – b
- DDA = a * b
153Choose the correct formula for computing secret key K by user A in Diffie & Hellman protocol
- AK = (YА)^X А mod q
- BS = a + b
- CD = a * b
- DL = a * b + 2
154Elgamal cryptography uses exponentiation in a finite (Galois) fields
- AVerdadeiro
- BFalso
155In the Elgamal cryptography when the user A generates their key a secret key should be
- A1 < XА < q-1
- Bgenerated randomly
- Cgiven by user
- Dnone
156Choose the correct formula for computing public key YA in Elgamal cryptography
- AYА = аXА mod q
- BK = YАk mod q
- CK = (YА)^X А mod q
- DYА= а mod q
157Choose the correct formula for computing one-time key K in Elgamal cryptography
- AK = YАk mod q
- BS = a + b + 1
- CD = a * b + 2
- DL = a * b + 3
158Choose the correct formula for computing C1 in Elgamal cryptography
- AC1 = аk mod q
- BC3 = a mod b
- CC = z + 2 + 5
- DC5 = a * b +2
159Choose the correct formula for computing C2 in Elgamal cryptography
- AC2 = KM mod q
- BC = MK
- CC3 = AK
- DC4 = AA
160In Elgamal cryptography public key cryptosystem related to D-H
- AVerdadeiro
- BFalso
161Known plaintext is...
- Aattacker knows suspects plaintext/ciphertext
- Bonly know algorithm & ciphertext, is statistical, must know or be able to identify plaintext
- Cattacker selects plaintext and gets ciphertext
- Dattacker selects ciphertext and gets plaintext
- EAttacker selects plaintext or ciphertext to en/decrypt
162Chosen plaintext is...
- Aattacker knows suspects plaintext/ciphertext
- Bonly know algorithm & ciphertext, is statistical, must know or be able to identify plaintext
- Cattacker selects plaintext and gets ciphertext
- Dattacker selects ciphertext and gets plaintext
- EAttacker selects plaintext or ciphertext to en/decrypt
163Chosen ciphertext is...
- Aattacker knows suspects plaintext/ciphertext
- Bonly know algorithm & ciphertext, is statistical, must know or be able to identify plaintext
- Cattacker selects plaintext and gets ciphertext
- Dattacker selects ciphertext and gets plaintext
- EAttacker selects plaintext or ciphertext to en/decrypt
164Chosen text is ...
- Aattacker knows suspects plaintext/ciphertext
- Bonly know algorithm & ciphertext, is statistical, must know or be able to identify plaintext
- Cattacker selects plaintext and gets ciphertext
- Dattacker selects ciphertext and gets plaintext
- Eattacker selects plaintext or ciphertext to en/decrypt
Informações
- Descrição
- - at Quiz sobre Information security and data protection, criado por хомяк убийца em 12-05-2018.
- Autor
- хомяк убийца
- Idioma
- English
- Visualizações
- 1.441
- Etiquetas
- Avaliação
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