WGU C839 - INTRO TO CRYPTOGRAPHY EXAM
QUESTIONS AND 100% CORRECT ANSWERS (A+) 2025
Which encryption standard uses the same key to encrypt and decrypt messages?
A) Asymmetric Key Encryption
B) Symmetric Key Encryption
C) Public Certificate
D) CRL
B
Which algorithm is designated as a Type 2 product by the National Security
Agency (NSA)?
A) DES
B) AES
C) SKIPJACK
D) WEP
C
What is the most commonly used format for certificates?
A) X.509 v2
B) X.509 v3
C) sha-1
D) sha-2
B
What is referenced to determine if a certificate has been revoked?
A) Certificate Revocation List
B) Certificate Revocation Authority
C) Certificate Approver
D) Revocation List
A
,What needs to be installed on end users' computers to allow them to trust
applications that have been digitally signed by the developer?
A) Sender's public key
B) Sender's private key
C) Receiver's public key
D) Receiver's private key
A
Which type of certificate must be certified by an authority to verify it with other
participants?
A) Public Certificate
B) Private Certificate
C) Certificate Provider
D) Revocation Authority
A
What is an attribute of the Rivest Cipher 4 (RC4) algorithm?
A) It performs CRC after every iteration
B) Salting is performed.
C) It requires a unique nonce.
D) It does not require a unique nonce.
C
Which mode generates the key stream with a nonce and incrementing value?
A) Certificate Revocation List (CRL)
B) Nonce mode
C) Rivest Cipher 4 (RC4)
D) Counter (CTR)
D
, Which mode is a stream algorithm that concatenates an incrementing value with a
nonce?
A) CAT
B) Nonce
C) Counter (CTR)
D) RC4
C
Which key would an administrator use to encrypt data so only the CEO can
decrypt it?
A) CEO's public key
B) CEO's private key
C) Administrator's private key
D) Administrator's public key
A
What is the result of a hash function?
A) RC4
B) Public key
C) decryption
D) Digest
D
What is used to efficiently encrypt large files?
A) Asymmetric Encryption
B) Hashing
C) Symmetric Encryption
D) RC4
C
QUESTIONS AND 100% CORRECT ANSWERS (A+) 2025
Which encryption standard uses the same key to encrypt and decrypt messages?
A) Asymmetric Key Encryption
B) Symmetric Key Encryption
C) Public Certificate
D) CRL
B
Which algorithm is designated as a Type 2 product by the National Security
Agency (NSA)?
A) DES
B) AES
C) SKIPJACK
D) WEP
C
What is the most commonly used format for certificates?
A) X.509 v2
B) X.509 v3
C) sha-1
D) sha-2
B
What is referenced to determine if a certificate has been revoked?
A) Certificate Revocation List
B) Certificate Revocation Authority
C) Certificate Approver
D) Revocation List
A
,What needs to be installed on end users' computers to allow them to trust
applications that have been digitally signed by the developer?
A) Sender's public key
B) Sender's private key
C) Receiver's public key
D) Receiver's private key
A
Which type of certificate must be certified by an authority to verify it with other
participants?
A) Public Certificate
B) Private Certificate
C) Certificate Provider
D) Revocation Authority
A
What is an attribute of the Rivest Cipher 4 (RC4) algorithm?
A) It performs CRC after every iteration
B) Salting is performed.
C) It requires a unique nonce.
D) It does not require a unique nonce.
C
Which mode generates the key stream with a nonce and incrementing value?
A) Certificate Revocation List (CRL)
B) Nonce mode
C) Rivest Cipher 4 (RC4)
D) Counter (CTR)
D
, Which mode is a stream algorithm that concatenates an incrementing value with a
nonce?
A) CAT
B) Nonce
C) Counter (CTR)
D) RC4
C
Which key would an administrator use to encrypt data so only the CEO can
decrypt it?
A) CEO's public key
B) CEO's private key
C) Administrator's private key
D) Administrator's public key
A
What is the result of a hash function?
A) RC4
B) Public key
C) decryption
D) Digest
D
What is used to efficiently encrypt large files?
A) Asymmetric Encryption
B) Hashing
C) Symmetric Encryption
D) RC4
C
