Preassesment Introduction to Cryptography C839 WGU |
UPDATED Questions with 100% Verified Answers
Q1: 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
A: Private key of the root CA
Q2: 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
A: Public key of the company
Q3: 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
A: Public Key Cryptography Standard (PKCS) #12
Q4: 4. Which field displays the hash, or digest, of the certificate in an X.509 certificate? Subject Issuer
Version Thumbprint
A: Thumbprint
Q5: 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
A: Employee A's private key
Q6: 6. What is an example of a symmetric algorithm? RSA AES SHA MD5
A: AES
Q7: 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
A: Cryptographic algorithm
Cryptographic key
, Q8: 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
A: Employee B's public key
Q9: 9. Which type of cipher is ChaCha? Asymmetric Block Stream Hash
A: Stream
Q10: 10. What is the key size for RC4 with WEP? 40 bits 128 bits 256 bits 512 bits
A: 40 bits
Q11: 11. Which symmetric encryption technique uses a 56bit key size and a 64bit block size? AES DES
3DES IDEA
A: DES
Q12: 12. Which wireless security standard uses a 128bit RC4 stream cipher for encrypted communications?
WPA WEP VPN GSM
A: WPA
Q13: 13. What defines a prime number? Only has factors of itself and 1 Only has factors of itself and 2 Evenly
divisible by 3.14 Evenly divisible by 10
A: Only has factors of itself and 1
Q14: 14. What is 29 mod 12? 0 3 5 7
A: 5
Q15: 15. What happens to the hash of a file if it is rehashed after the first character of the file is changed?
The entire hash is different. The beginning of the hash is altered. The hash is unaltered. The hash algorithm
is replaced.
A: The entire hash is different.
Q16: 16. What is the length (in bits) of an MD5 hash output? 32 64 128 256
A: 128
UPDATED Questions with 100% Verified Answers
Q1: 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
A: Private key of the root CA
Q2: 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
A: Public key of the company
Q3: 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
A: Public Key Cryptography Standard (PKCS) #12
Q4: 4. Which field displays the hash, or digest, of the certificate in an X.509 certificate? Subject Issuer
Version Thumbprint
A: Thumbprint
Q5: 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
A: Employee A's private key
Q6: 6. What is an example of a symmetric algorithm? RSA AES SHA MD5
A: AES
Q7: 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
A: Cryptographic algorithm
Cryptographic key
, Q8: 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
A: Employee B's public key
Q9: 9. Which type of cipher is ChaCha? Asymmetric Block Stream Hash
A: Stream
Q10: 10. What is the key size for RC4 with WEP? 40 bits 128 bits 256 bits 512 bits
A: 40 bits
Q11: 11. Which symmetric encryption technique uses a 56bit key size and a 64bit block size? AES DES
3DES IDEA
A: DES
Q12: 12. Which wireless security standard uses a 128bit RC4 stream cipher for encrypted communications?
WPA WEP VPN GSM
A: WPA
Q13: 13. What defines a prime number? Only has factors of itself and 1 Only has factors of itself and 2 Evenly
divisible by 3.14 Evenly divisible by 10
A: Only has factors of itself and 1
Q14: 14. What is 29 mod 12? 0 3 5 7
A: 5
Q15: 15. What happens to the hash of a file if it is rehashed after the first character of the file is changed?
The entire hash is different. The beginning of the hash is altered. The hash is unaltered. The hash algorithm
is replaced.
A: The entire hash is different.
Q16: 16. What is the length (in bits) of an MD5 hash output? 32 64 128 256
A: 128
