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WGU- C839 PRE-ASSESMENT - INTRODUCTION TO CRYPTOGRAPHY
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WGU- C839 PRE-ASSESMENT - INTRODUCTION TO CRYPTOGRAPHY
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WGU- C839 PRE-ASSESMENT - INTRODUCTION TOCRYPTOGRAPHY
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
10. What is the key size for RC4 with WEP?
40 bits
128 bits
256 bits
512 bits - answer- 40 bits
11. Which symmetric encryption technique uses a 56-bit key size and a 64-bit block
size?
AES
DES
3DES
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