WGU INTRODUCTION TO
CRYPTOGRAPHY C839 ACTUAL EXAM
QUESTIONS AND CORRECT ANSWERS
COMPLETE TEST PAPER
●● 2. A business wants to use keys issued by a trusted third party to
demonstrate it is a legitimate organization to potential customers.
Which key should the business send to potential customers to prove its
identity?
Private key of the root CA
Public key of the root CA
Private key of the company
Public key of the company
Answer: Public key of the company
●● 3. What should an administrator use to import and export all items
written using X.509 that are part of a chain of trust?
CER
Public Key Cryptography Standard (PKCS) #7
Public Key Cryptography Standard (PKCS) #12
,RTF
Answer: Public Key Cryptography Standard (PKCS) #12
●● 4. Which field displays the hash, or digest, of the certificate in an
X.509 certificate?
Subject
Issuer
Version
Thumbprint
Answer: Thumbprint
●● 5. Employee B sends Employee A an encrypted message.
What does Employee A use to decrypt the message from Employee B?
Employee A's private key
Employee B's private key
Employee A's public key
Employee B's public key
Answer: Employee A's private key
●● 6. What is an example of a symmetric algorithm?
, RSA
AES
SHA
MD5
Answer: AES
●● 7. Which two components involved in performing encryption are
known to the party that will perform decryption before symmetric
encryption is applied?
Choose 2 answers.
Cryptographic algorithm
Cryptographic key
Plaintext content
Initialization vector
Nonce value
Answer: Cryptographic algorithm
Cryptographic key
●● 8. Employee A created a secret key and wants to send it to Employee
B without any coworkers being able to decrypt the message.
Which key needs to encrypt the message?
CRYPTOGRAPHY C839 ACTUAL EXAM
QUESTIONS AND CORRECT ANSWERS
COMPLETE TEST PAPER
●● 2. A business wants to use keys issued by a trusted third party to
demonstrate it is a legitimate organization to potential customers.
Which key should the business send to potential customers to prove its
identity?
Private key of the root CA
Public key of the root CA
Private key of the company
Public key of the company
Answer: Public key of the company
●● 3. What should an administrator use to import and export all items
written using X.509 that are part of a chain of trust?
CER
Public Key Cryptography Standard (PKCS) #7
Public Key Cryptography Standard (PKCS) #12
,RTF
Answer: Public Key Cryptography Standard (PKCS) #12
●● 4. Which field displays the hash, or digest, of the certificate in an
X.509 certificate?
Subject
Issuer
Version
Thumbprint
Answer: Thumbprint
●● 5. Employee B sends Employee A an encrypted message.
What does Employee A use to decrypt the message from Employee B?
Employee A's private key
Employee B's private key
Employee A's public key
Employee B's public key
Answer: Employee A's private key
●● 6. What is an example of a symmetric algorithm?
, RSA
AES
SHA
MD5
Answer: AES
●● 7. Which two components involved in performing encryption are
known to the party that will perform decryption before symmetric
encryption is applied?
Choose 2 answers.
Cryptographic algorithm
Cryptographic key
Plaintext content
Initialization vector
Nonce value
Answer: Cryptographic algorithm
Cryptographic key
●● 8. Employee A created a secret key and wants to send it to Employee
B without any coworkers being able to decrypt the message.
Which key needs to encrypt the message?
