WGU C839 OBJECTIVE ASSESSMENT 1 (VERSION A & B) /WGU
C839 INTRODUCTION TO CRYPTOGRAPHY OA ACTUAL EXAM
LATEST 2024
What is used to efficiently encrypt large files? - ANS - Symmetric encryption
An administrator needs to encrypt the following word with the Atbash cipher: security What is the
correct ciphertext? - ANS - hvxfirgb
Which cryptographic algorithm has a 128-bit hash size? - ANS - Message Digest Algorithm 5 (MD5)
Which characteristic makes a hashing function suitable for use in signature schemes? - ANS - Collision
resistance
Which attribute of a hashing function makes a birthday attack possible? - ANS - Partial-message collision
Which encryption standard uses the same key to encrypt and decrypt messages? - ANS - Symmetric
Which algorithm is designated as a Type 2 product by the National Security Agency (NSA)? - ANS -
Skipjack
What is the most commonly used format for certificates? - ANS - X.509 v3
What is referenced to determine if a certificate has been revoked? - 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? - ANS - Sender's public key
, 2
Which type of certificate must be certified by an authority to verify it with other participants? - ANS -
Public Certificate
What is an attribute of the Rivest Cipher 4 (RC4) algorithm? - ANS - It requires a unique nonce.
Which mode generates the key stream with a nonce and incrementing value? - ANS - Counter (CTR)
Which mode is a stream algorithm that concatenates an incrementing value with a nonce? - ANS -
Counter (CTR)
Which key would an administrator use to encrypt data so only the CEO can decrypt it? - ANS - CEO's
public key
Which key combination is used to decrypt and verify a digital signature? - ANS - Recipient's private key to
decrypt and sender's public key to verify the signature
Which key is used to sign a message or a message digest? - ANS - Sender's private key
Which key does the certificate authority (CA) use to digitally sign keys that it issues? - ANS - Server's
private key
What does an end user need to verify a Rivest-Shamir -Adleman (RSA) digitally signed message? - ANS -
Sender's public key
What is used when creating a digital signature, using public key infrastructure (PKI)? - ANS - The private
key of the person creating the message
Which feature in Wired Equivalent Privacy (WEP) provides integrity control when sending packets over a
wireless network? - ANS - Cyclic redundancy check
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