Pre-assesment - Introduction to
Cryptography - C839 - WGU
with 100% correct answers
1. A business wants to use keys issued by a trusted third party to
demonstrate to potential customers that it is a legitimate
organization.
Which key is used to sign the certificate issued to the business?
Private key of the root CA
Public key of the root CA
Private key of the company
Public key of the company - answer Private key of the root CA
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?
Employee A's public key
Employee A's private key
Employee B's public key
Employee B's private key - answer Employee B's public key
9. Which type of cipher is ChaCha?
Asymmetric
Block
Stream
Hash - answer Stream
Cryptography - C839 - WGU
with 100% correct answers
1. A business wants to use keys issued by a trusted third party to
demonstrate to potential customers that it is a legitimate
organization.
Which key is used to sign the certificate issued to the business?
Private key of the root CA
Public key of the root CA
Private key of the company
Public key of the company - answer Private key of the root CA
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?
Employee A's public key
Employee A's private key
Employee B's public key
Employee B's private key - answer Employee B's public key
9. Which type of cipher is ChaCha?
Asymmetric
Block
Stream
Hash - answer Stream
