Test
Intro to Cryptography Practice Test
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Preguntas del test (63)
1What term from the list below best describes a data concealment method for covert communication that makes use of LSB replacement?
- ACryptanalysis
- BSteganalysis
- CSteganography
- DWhitening
2Which block cipher below uses a block size of 128 bits and key sizes up to 256 bits?
- ADES
- BBlowfish
- CTwofish
- DTiger
3Symmetric Encryption is expressed mathematically as:
- AC = E(k,p)
- BP = E(k,c)
- CMe % n
- Dy2 = x3 +Ax + b
4Hash Value Matching
Tiger [blank_start]192[blank_end]
SHA1 [blank_start]160[blank_end]
GOST [blank_start]256[blank_end]
MD5 [blank_start]128[blank_end]- A192
- B160
- C256
- D128
5Symmetric Block Cipher to Key and Block Size Matching
AES & Serpent [blank_start]128 bit Blocks; 128, 192, or 256 bit Key[blank_end]
IDEA [blank_start]64 Bit Blocks; 128 bit Key[blank_end]
DES [blank_start]64 bit Blocks; 56 bit Key[blank_end]
Blowfish [blank_start]64 bit Blocks; 32-448 bit Key[blank_end]
Twofish [blank_start]128 bit blocks; 1-256 bit key[blank_end]
Skipjack [blank_start]64 bit block; 80 bit key[blank_end]- A128 bit Blocks; 128, 192, or 256 bit Key
- B64 Bit Blocks; 128 bit Key
- C64 bit Blocks; 56 bit Key
- D64 bit Blocks; 32-448 bit Key
- E128 bit blocks; 1-256 bit key
- F64 bit block; 80 bit key
6Identify and select the asymmetric encryption algorithms from the list below. (Select 3).
- ARSA
- BMD5
- CECC
- DRIPEMD-160
- EIDEA
- FAES
- GDSA
- HOFB
7Identify and select the symmetric stream ciphers from the list below. (Select 3).
- ADES
- BBlowfish
- CFISH
- DRC4
- EECC
- FGOST
- GPIKE
- HAES
8Identify and select the hash algorithms from the list below. (Select 4).
- AAES
- BDH
- CFORK256
- DRC4
- EMD5
- FGOST
- GPIKE
- HRIPEMD-160
9Identify and select three viable options for key exchange from the list below.
- ARSA
- BMD5
- CECDH
- DRIPEMP-160
- EDH
- FEAS
- GSHA256
- HMQV
10Identify and select the 32-round symmetric block ciphers from the list below. (Select two.
- ARSA
- BDSA
- CSkipjack
- DSerpent
- EDH
- FAES
- GBlowfish
- HDES
11Which asymmetric encryption algorithm leverages characteristics of prime numbers and utilizes variable
key lengths (1024-4096)?- ADSA
- BECC
- CRSA
- DSerpent
12Which equation below represents the encryption process for RSA?
- AC = E(k,p)
- BP = E(k,c)
- CMe % n
- Dy2 = x3 +Ax + B
13How many rounds are used in AES encryption?
- A8, 10, or 12
- B10, 12, or 24
- C32
- D16
14Of the two processes used in symmetric key cryptography, which involves XORing the plaintext message
with the key?- ATransposition
- BInitialization
- CClustering
- DSubstitution
15Of the two processes used in symmetric key cryptography, which involves swapping blocks of the text?
- ATransposition
- BInitialization
- CClustering
- DSubstitution
16An instance where two different pieces of data are hashed separately, but both result in a single identical
hash value is described by what term?- ACollision
- BClustering
- CEvolution
- DPolybus
17An instance where different encryption keys generate the same cipher text from the same plain text
message is described by what term?- AColumnar Rotation
- BColumnar Substitution
- CCollision
- DClustering
18Symmetric decryption is expressed mathematically as:
- AC = E(k,p)
- BP = E(k,c)
- CME % n
- Dy2 = x3 +Ax +B
19Instances where a change in in one bit in the plaintext would affect all the bits of the ciphertext is best
described by what term?- AAvalanche
- BDiffusion
20Instances where a change in in one bit in the plaintext would affect multiple characters in the ciphertext is
best described by what term?- AConfusion
- BDiffusion
21What is the standard for digital certificates?
- ARFC 3526
- BDSA
- CFIPS 197
- DX.509
22If timeliness is a priority factor for checking revocation status, which option from the list below would you
prefer and why?- ACRL, because it facilitates verifying certificates in real time
- BOCSP, because it facilitates verifying certificates in real time
23When looking for an encryption scheme where speed is of utmost importance, which would you prefer
from the list below?- ASymmetric
- BAsymmetric
24When looking for an encryption solution for the data on your computer where full disk encryption is of
utmost importance, which would you select from the list below?- ABitlocker
- BEFS
25What Federal Information Processing Standard pertains to DSA?
- AFIPS 197
- BFIPS 196
- CFIPS 180-4
- DFIPS 179
26What Federal Information Processing Standard pertains to AES?
- AFIPS 197
- BFIPS 196
- CFIPS 180-4
- DFIPS 179
27From the list below, which two symmetric block encryption modes turn block ciphers into stream ciphers?
- AOFB
- BCTR
- CECb
- DRC4
28With which encryption type would you mostly likely need an accompanying key exchange solution for?
- AAsymmetric
- BSymmetric
29What term from the list below best represents “one-way” encryption i.e. not reversible?
- ASalt
- BSymmetric
- CDES
- DHash
30Which equation below is associated with Elliptic Curve?
- AC = E(k,p)
- BP = E(k,c)
- CMe % n
- Dy2 = x3 +Ax +B
31From the terms below, which are associated with encryption using two keys? (Select 3)
- AAsymmetric
- BSymmetric
- CDES
- DRSA
- ESHA-2
- FAES
- GDSA
- HTwofish
32If you are sending an encrypted message to a colleague using symmetric encryption, of the choices below,
(1) which key would you use to encrypt the message, and (2) which key would your colleague use to
decrypt the message?- A(1) your colleague’s public key, (2) your colleague’s private key
- B(1) your public key, (2) your private key
- C(1) your private key, (2) your private key
- D(1) your colleague’s private key, (2) your public key
33If you are sending an encrypted message to a colleague using asymmetric encryption, of the choices
below, (1) which key would you use to encrypt the message, and (2) which key would your colleague use
to decrypt the message?- A(1) your colleague’s public key, (2) your colleague’s private key
- B(1) your public key, (2) your private key
- C(1) your private key, (2) your private key
- D(1) your colleague’s private key, (2) your public key
34From the list below, what term best describes an arbitrary, random or pseudo-random number used only
once in cryptographic communication and is then discarded?- AKey
- BAlgorithm
- CRound
- DNonce
35What term below best describes an attack in which the attacker only has access to the ciphertext of a
message?- AChosen ciphertext
- BCiphertext only
- CKnown Plaintext
- DPlaintext only
36According to Kerchoff’s Principle, a cryptosystem will remain secure so long as which component of it is
not publicly known?- AKey
- BDecryption Algorithm
- CCiphertext
- DEncryption Algorithm
37What technique should be used in conjunction with substitution to break up letter/word frequency and
aid in combatting frequency analysis attacks?- ADecoding
- BHashing
- CSigning
- DTransposition
38What trusted entity associated with certificate management is responsible for issuing, revoking, and
managing digital certificates?- ACertification Authority
- BRegistration Authority
- CCertificate Authority
- DKey Distribution Center
39What symmetric cipher was developed for use in the clipper chip?
- ASkipjack
- BTwofish
- CBlowfish
- DDSA
40Which term from the list below best describes a number that only shares the number 1 as a common
factor with another?- APrime
- BCo-Prime
- CRational
- DReciprocal
41What is the binary XOR result the following number sets 10011011 & 11111110?
- A10011010
- B01100101
- C11111111
- D00000000
42The Feistel Network used in symmetric block encryption entails the splitting of a block of plaintext prior to
the application of respective encryption round and XOR functions. Which cipher from the list below is an
“unbalanced” Feistel cipher (i.e. blocks of plaintext are split into unequal parts)?- ARC4
- BSkipjack
- CPIKE
- DTIGER
43From the list below, which term is best described as a fixed-size, random stream, that is added to a block
cipher to increase randomness?- AFeistel
- BInitialization Vector
- CSession Key
- DInduction Vector
44From the list below, which term is best described as random bits added to a password hash to help with
safeguarding passwords in storage?- ANonce
- BSalt`
- CIV
- DRounds
45The Advanced Encryption Standard is a subset of which algorithm?
- ALucifer
- BKasiski
- CFibonacci
- DRijndael
46Which software-based stream cipher uses a lagged Fibonacci generator?
- AGOST
- BFISH
- CBlowfish
- DTwofish
47Which of the following is true of hash encryption?
- ARequires a fixed length input and produces a different fixed length output
- BRequires a fixed length input and produces a variable length output
- CAccepts a variable length input and produces a fixed length output
- DAccepts a variable length input and produces a different variable length output
48What are the two types of symmetric encryption?
- ABlock
- BStrong
- CFixed
- DStream
49Which WiFI encryption standard is based on 802.11i and uses AES with CCMP to provide for enhanced
confidentiality, integrity and authentication?- AWPA
- BWEP
- CWPA-2
- DBluetooth
50What is the binary OR result the following number sets 10011011 & 11111110?
- A10011010
- B01100101
- C11111111
- D00000000
51What type of cryptanalysis involves the examination of differences in an input and how that affects the
resultant difference in output?- AHypothesis cryptanalysis
- BLinear cryptanalysis
- CPseudo-random cryptanalysis
- DDifferential cryptanalysis
52Identify and select the mono-alphabetic ciphers from the list below. (Select 4)
- AVigenere
- BAtbash
- CCeasar
- DScytale
- EENIGMA
- FDisk Cipher
- GROT-13
- HADFGVX
53Which cipher entails using a rod of a certain length to create/encrypt a message, and the requiring the
message recipient to use an identical sized rod to read/decrypt the message?- AScytale
- BAtbash
- CPlayfair
- DPIKE
54Which cipher makes use of a 5x5 table containing a keyword or key phrase and encrypts pairs of letters or
digraphs?- AScytale
- BCasear
- CPlayfair
- DAtbash
55Which term from the list below represents the entire cryptographic operation i.e. the algorithm, key, and
key management functions?- ACryptography
- BCryptanalysis
- CCryptology
- DCryptosystem
56Which term from the list below represents the total number of possible values of keys in a cryptographic
algorithm or other security measure?- AKey negotiation
- BKey space
- CCryptovariable
- DInitialization vector
57What term from the list below best describes a number whose factors are 1 and itself?
- APrime
- BCo-Prime
- CRational
- DPseudo-random
58From the list below, what term describes a mechanism used to create number streams with random
properties? Examples include Lagged Fibonacci and Mersenne Twister.- AModulus Operator
- BHash Algorithm
- CCrypto randomizer
- DPseudo-random number generator
59Kerberos Component Matching
[blank_start]Ticket[blank_end] - Used to authenticate. Contains the identity of the client, the session key, timestamp, and
checksum
[blank_start]TGS[blank_end] - Issues tickets
[blank_start]KDC[blank_end] - Server that provides the initial ticket
[blank_start]TGT[blank_end] - The ticket that is granted during the authentication process
[blank_start]AS[blank_end] - Server that authorizes the principal and connects them to the ticket granting server- ATicket
- BTGS
- CKDC
- DTGT
- EAS
60Wifi Attribute Matching
[blank_start]WEP[blank_end] - Uses RC4, employs a 40-bit key with a 24-bit IV
[blank_start]WPA[blank_end] - Replaces RC4 with TKIP
[blank_start]WPA-2[blank_end] - 802.11i, uses AES with CCMP
[blank_start]WPA-2 Enterprise[blank_end] - WPA-802.1x, requires RADUIS, employs EAP for authentication- AWEP
- BWPA
- CWPA-2
- DWPA-2 Enterprise
61What term below best describes an attack in which the attacker obtains ciphertext corresponding to a set
of plaintexts to use in an attempt to derive the key used?- AChosen plaintext
- BCiphertext only
- CKnown plaintext
- DPlaintext only
62What are the four general steps involved with AES?
- ARounds
- BInitial Round
- CFinal Round
- DHash Session
- ENegotiation
- FKey Expansion
- GReversal
- HWhitening
63To be suitable for cryptography, what German Federal Office for Information Security (BSI) criteria level
(s) should a PRNG meet?- AK1
- BK2
- CK3
- DK4
Información
- Descripción
- Test sobre Intro to Cryptography Practice Test, creado por Eric Jensen el 11/01/2020.
- Autor
- Eric Jensen
- Idioma
- English
- Visitas
- 8
- Valoración
- Aún sin valoraciones Valora este test