C839- Cryptography Questions with Verified
Correct Answers
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
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?
Public key of the company
What should an administrator use to import and export all items written using X.509
that are part of a chain of trust?
Public Key Cryptography Standard (PKCS) #12
Which field displays the hash, or digest, of the certificate in an X.509 certificate?
thumbprint
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
What is an example of a symmetric algorithm?
AES
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
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 B's public key
Which type of cipher is ChaCha?
stream
What is the key size for RC4 with WEP?
40 bits
Which symmetric encryption technique uses a 56-bit key size and a 64-bit block size?
DES
Which wireless security standard uses a 128-bit RC4 stream cipher for encrypted
communications?
WPA
What defines a prime number?
Only has factors of itself and 1
What is 29 mod 12?
5
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.
Correct Answers
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
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?
Public key of the company
What should an administrator use to import and export all items written using X.509
that are part of a chain of trust?
Public Key Cryptography Standard (PKCS) #12
Which field displays the hash, or digest, of the certificate in an X.509 certificate?
thumbprint
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
What is an example of a symmetric algorithm?
AES
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
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 B's public key
Which type of cipher is ChaCha?
stream
What is the key size for RC4 with WEP?
40 bits
Which symmetric encryption technique uses a 56-bit key size and a 64-bit block size?
DES
Which wireless security standard uses a 128-bit RC4 stream cipher for encrypted
communications?
WPA
What defines a prime number?
Only has factors of itself and 1
What is 29 mod 12?
5
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.
