Quiz
Cryptography Practice Test C839
Create a free account to finish this quiz
Save your progress and see your final score.
Already have an account? Sign in
Questions in this quiz (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4What is referenced to determine if a certificate has been revoked?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
Information
- Description
- Quiz on Cryptography Practice Test C839, created by Abigail Zorn on 11/01/2021.
- Author
- Abigail Zorn
- Language
- English
- Views
- 2
- Rating
- No ratings yet Rate this quiz