Test
Cryptography Practice Test C839
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Preguntas del test (60)
1Which encryption standard uses the same key standard to encrypt and decrypt messages?
- ASymmetric
- BAsymmetric
- CRivest-Shamir-Adleman (RSA)
- DDigital Signature Algorithm (DSA)
2Which algorithm is designated as a Type 2 product by the National Security Agency (NSA)?
- AData Encryption Standard (DES)
- BSecure hash algorithm (SHA)
- CSkipjack
- DPEGASUS
3What is the most commonly used format for certificates?
- AX.509 v1
- BX.509 v3
- CSecure Hash Algorithm 1 (SHA-1)
- DSecure Hash Algorithm 2 (SHA-2)
4What is referenced to determine if a certificate has been revoked?
- ACertificate revocation list (CRL)
- BData Encryption Standard (DES)
- CRivest-Shamir-Adelman (RSA)
- DSecure hash algorithm (SHA)
5What needs to be installed on end users' computer to allow them to trust applications that have been digitally signed by the developer?
- ASender's public key
- BSender's private key
- CAdministrator's public key
- DAdministrator's private key
6Which type of certificate must be certified by an authority to verify it with other participants?
- APublic
- BRoot
- CPrivate
- DDomain
7What is an attribute of the Rivest Cipher 4 (RC4) algorithm?
- AIt encrypts whole blocks of data at a time.
- BIt is an asymmetric cipher.
- CIts keys are longer than the encrypted message.
- DIt requires a unique nonce.
8Which mode generates the key stream with a nonce and incrementing value?
- AElectronic Codebook (ECB)
- BCipher Block Chaining (CBC)
- COutput FeedBack (OFB)
- DCounter (CTR)
9Which mode is a stream algorithm that concatenates as an incrementing value with a nonce?
- AElectric Codebook (ECB)
- BCipher Block chaining (CBC)
- COutput Feedback (OFB)
- DCounter (CTR)
10Which key would an administrator use to encrypt data so only the CEO could encrypt it?
- AAdministrator's private key
- BAdministrator's public key
- CCEO's private key
- DCEO's public key
11What is the result of a hash function (called)?
- ADigest
- BSignature
- CCiphertext
- DPlaintext
12What is used to efficiently encrypt large files?
- AHash function
- BXML function
- CAsymmetric function
- DSymmetric function
13An administrator needs to encrypt the following word with the ATBASH cipher:
security
What cipher text is correct?- Ahvxfirgb
- Bhemfirjc
- Chexfirgc
- Dhyxfigrb
14What cryptographic algorithm has a 128-bit hash size?
- ASecure Hash Algorithm 1 (SHA-1)
- BMessage Digest Algorithm 5 (MD5)
- CTriple Data Encryption Standard (3DES)
- DAdvanced Encryption Standard (AES)
15Which characteristic makes a hashing function suitable for use in signature schemas?
- AVarying operational modes
- BUse of bit-by-bit encryption
- CUse of unique key values
- DCollision resistance
16Which attribute of a hashing function makes a birthday attack possible?
- AMan-in -the-middle detection
- BPartial-message collision
- CBrute force protection
- DPlaintext
17What hash algorithm produces a 160-bit output value?
- ASHA-1
- BMD5
- CSHA-2
- DDiffie-Hellman
18What does cipher block chaining (CBC) use with the key to encrypt subsequent blocks of plaintext?
- ACounter
- BNonce
- CPrevious generated ciphertext
- DPrevious plaintext
19Which mode produces the same ciphertext from two identical plaintext blocks?
- ACipher block chaining (CBC)
- BOutput feedback (OFB)
- CCTR (CTR)
- DElectronic Codebook (ECB)
20Which encryption mode is least secure?
- ACipher block chaining (CBC)
- BCipher feedback (CFB)
- CElectronic Codebook (ECB)
- DOutput Feedback (OFB)
21What is the mathematical formula used for symmetrical decryption?
- AP = E (K,C)
- BC = E (K,P)
- CE = C (K,P)
- DK = C (P,E)
22Which algorithm relies on factoring the product of large prime numbers?
- AElliptical curve
- BElGamal
- CRivest-Shamir-Adleman (RSA)
- DDiffie-Hellman
23Which encryption technology is a serial combination of hashing, data compression, symmetric-key cryptography, and public-key infrastructure (PKI) and can be used for encrypting texts, emails, files, and directories or for full disk encryption?
- APretty Good Privacy (PGP)
- BWired Equivalent Privacy (WEP)
- CDiffie Hellman (DH)
- DRivest-Shamir-Adleman (RSA)
24What concept stipulates that algorithms should be openly shared and scrutinized, but keys must be absolutely secured?
- ACommunication Theory of Secrecy Systems
- BKerckhoffs’s principle
- CFeistel function
- DMathematical Theory of Communication
25What encryption process minimizes known plaintext attacks against Advanced Encryption Standard (AES)?
- ARandomizing the initialization vector
- BUsing a hashing vector
- CIncreasing the block size
- DDecreasing the block size
26What prevents a rainbow table attack during the encryption process?
- AIncreasing the key size
- BDecreasing the key size
- CStretching
- DSalting
27Which factor increases the number of required number of attempts in a brute force attack?
- ALarger block size
- BLarger key size
- CMore rounds
- DMore calculation
28What is a vulnerability of the Data Encryption Standard (DES)?
- AKey length is too long
- BKey length is too short
- CBits are rearranged in a semi-ordered fashion during the encryption process.
- DThe plaintext is split into two equal halves that are labeled L and R.
29Which block size does the Advanced Encryption Standard (AES) use?
- A64
- B128
- C192
- D256
30Which block algorithm includes a provision for the decryption key kept in a key escrow?
- ABlowfish
- BSerpent
- CSkipjack
- DTwofish
31What is the result of A|B and B|C?
- AB|A
- BC|B
- CA|C
- DC|A
32How is X mod N if N=PQ represented in number theory?
- A(((( A- B)( Q − 1 mod Q))mod Q) Q+ B )mod P
- B( P mod X, Q mod X)
- C(((( A+ B)( Q − 1 mod P))mod P) Q+ B )mod P
- D( X mod P, X mod Q)
33What is the outcome when using the binary AND function on 11011 and 10100
- A01110
- B10000
- C11110
- D21111
34Which mode does the Fortuna algorithm use to generate random numbers?
- AElectronic codebook (ECB)
- BCipher block chaining (CBC)
- COutput feedback (OFB)
- DCounter (CTR)
35What is a potential weakness of a pseudo-random number generator (PRNG)?
- AUnknown internal state
- BDifferent state used each time
- CRandom internal state
- DSame state more than once
36Which key combination is used to decrypt and verify a digital signature?
- ARecipient’s public key to decrypt and sender’s private key to verify the signature
- BRecipient’s private key to decrypt and sender’s public key to verify the signature
- CSender’s public key to decrypt and recipient’s private key to verify the signature
- DSender’s private key to decrypt and recipient’s public key to verify the signature
37Which key is used to sign a message or a message digest?
- ARecipient's private key
- BRecipient's public key
- CSender's private key
- DSender's public key
38Which key does the certificate authority (CA) use to digitally sign keys that it issues?
- ARecipient’s private key
- BRecipient’s public key
- CServer’s private key
- DServer’s public key
39What does an end user need to verify a Rivest–Shamir–Adleman (RSA) digitally signed message?
- ARecipient’s private key
- BRecipient’s public key
- CSender’s private key
- DSender’s public key
40What is used when creating a digital signature, using public key infrastructure (PKI)?
- AThe digest as the key after hashing the message
- BThe private key of the person receiving the message
- CThe private key of the person creating the message
- DThe symmetric key known between the sender and receiver
41Which feature in Wired Equivalent Privacy (WEP) provides integrity control when sending packets over a wireless network?
- ANonce
- BNetwork Password
- CCyclic Redundancy Check
- DSecret Key
42Which feature of Wi-fi Protected Access (WPA) increases the difficulty of attack?
- ATemporal Key Integrity Protocol (TKIP)
- BPre-shared Key (PSK)
- CExtensible Authentication Protocol (EAP)
- DInternet Key Exchange (IKE)
43Which two concerns does the use of Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP) address?
- AConfidentiality
- BNonrepudiation
- CAvailability
- DAccountability
- EIntegrity
44Which extension designates a file containing a password-protected private key?
- A.cer
- B.pem
- C.p7b
- D.p12
45Which part of the public key infrastructure (PKI) defines how a credential is used?
- ACertificate Authority (CA)
- BCertificate Policy (CP)
- CPublic Key Cryptographic Standards
- DRegistration Authority (RA)
46Which part of the Public Key Infrastructure (PKI) is used to ensure that the format for a credential can be used by anyone on the internet?
- ACertificate Authority (CA)
- BCertificate Policy
- CPublic Key Cryptography Standards (PKCS)
- DRegistration Authority (RA)
47Which solution is used in a Layer 2 Tunneling Protocol (L2TP) virtual private network (VPN) to secure data in transmission?
- ACipher block chaining (CBC)
- BHypertext Transfer Protocol Secure (HTTPS)
- CMicrosoft Point-to-Point Encryption (MPPE)
- DInternet Protocol Security (IPSec)
48Which network-based virtual private network (VPN) prevents unauthorized logins by preventing packet retransmission?
- APoint to Point Tunneling Protocol (PPTP)
- BIP Security (IPSec)
- CLayer 2 Tunneling Protocol (L2PT)
- DTransport Layer Security
49What port does Secure Socket Tunneling Protocol (SSTP) use?
- A389
- B443
- C1701
- D1723
50What is a common problem with using pre-shared keys (PSK)?
- AKey collision
- BSecure Key exchange
- CKey generation
- DSecure Key escrow
51What is a concern with storing long-term secrets on media or memory?
- AIntegrity
- BRandomness
- CModularization
- DAssertions
52What cipher uses a series of ciphers based on a keyword?
- AAffine
- BAtbash
- CCaesar
- DVigenère
53Which substitution cipher system reverses the sequence of the alphabet?
- AAtbash
- BCaesar
- CROT13
- DAffine
54Which type of cipher converts a letter to a number, passes it through a mathematical function, and then converts it back to a letter?
- AAtbash
- BCaesar
- CROT13
- DAffine
55Which technique solves polyalphabetic substitution ciphers by deducing the key length?
- AKasiki's method
- BFrequency analysis
- CExhaustive search
- DRainbow tables
56Which cryptoanalysis technique examines ciphertext for recurring letter combinations?
- ARainbow table
- BDictionary table
- CFrequency analysis
- DExhaustive search
57Which cryptanalysis method involves a person being tricked into encrypting a set of known messages?
- ACiphertext-only attack
- BChosen plaintext attack
- CFrequency analysis
- DKasiski examination
58Which technique does related-key cryptanalysis use to decipher a message?
- ACiphertext messages are created from plaintext that is chosen by the analyst to determine how the algorithm works.
- BEncrypted messages are gathered, and the analyst looks for patterns to figure out which algorithm is being used.
- CMessages are encrypted using different secrets, and the analyst compares the messages to figure out how the algorithm works.
- DPlaintext messages and corresponding ciphertext are gathered to help the analyst learn about the algorithm.
59Which type of cryptography is being used when the author uses secret inks?
- ACryptanalysis
- BSteganography
- CDigital Encryption
- DOne-time pad
60What is the hidden message in a steganographic communication?
- ABit
- BCarrier
- CChannel
- DPayload
Información
- Descripción
- Test sobre Cryptography Practice Test C839, creado por Abigail Zorn el 11/01/2021.
- Autor
- Abigail Zorn
- Idioma
- English
- Visitas
- 2
- Valoración
- Aún sin valoraciones Valora este test