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WGU C839 OA (Introduction To Cryptography) – Questions And Answers (100% Accurate)
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WGU C839 OA (Introduction To Cryptography) – Questions And Answers (100% Accurate)
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WGU C839 OA (Introduction To Cryptography) –Questions And Answers (100% Accurate)
Which encryption standard uses the same key to encrypt and decrypt
messages? Right Ans - Symmetric
Which algorithm is designated as a Type 2 product by the National Security
Agency (NSA)? Right Ans - Skipjack
What is the most commonly used format for certificates? Right Ans - X.509
v3
What is referenced to determine if a certificate has been revoked? Right
Ans - Certificate revocation list (CRL)
What needs to be installed on end users' computers to allow them to trust
applications that have been digitally signed by the developer? Right Ans -
Sender's public key
Which type of certificate must be certified by an authority to verify it with
other participants? Right Ans - Public Certificate
What is an attribute of the Rivest Cipher 4 (RC4) algorithm? Right Ans - It
requires a unique nonce.
Which mode generates the key stream with a nonce and incrementing value?
Right Ans - Counter (CTR)
Which mode is a stream algorithm that concatenates an incrementing value
with a nonce? Right Ans - Counter (CTR)
Which key would an administrator use to encrypt data so only the CEO can
decrypt it? Right Ans - CEO's public key
What is the result of a hash function? Right Ans - Digest
What is used to efficiently encrypt large files? Right Ans - Symmetric
encryption
, An administrator needs to encrypt the following word with the Atbash cipher:
security What is the correct ciphertext? Right Ans - hvxfirgb
Which cryptographic algorithm has a 128-bit hash size? Right Ans -
Message Digest Algorithm 5 (MD5)
Which characteristic makes a hashing function suitable for use in signature
schemes? Right Ans - Collision resistance
Which attribute of a hashing function makes a birthday attack possible?
Right Ans - Partial-message collision
Which hash algorithm produces a 160-bit output value? Right Ans - SHA-1
What does cipher block chaining (CBC) use with the key to encrypt
subsequent blocks of plaintext? Right Ans - Previous generated ciphertext
Which mode produces the same ciphertext from two identical plaintext
blocks? Right Ans - Electronic codebook (ECB)
Which encryption mode is least secure? Right Ans - Electronic codebook
(ECB)
What is the mathematical formula used for symmetric decryption? Right
Ans - P = E (K,C)
Which algorithm relies on factoring the product of large prime numbers?
Right Ans - Rivest-Shamir-Adleman
Which 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? Right Ans - Pretty Good Privacy (PGP)
Which concept stipulates that algorithms should be openly shared and
scrutinized, but keys must be absolutely secured? Right Ans - Kerckhoffs's
principle
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