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C839- Cryptography Questions and Answers
(Expert Solutions)
Q: 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?
ANS 🗹🗹: Private key of the root CA
Q: 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?
ANS 🗹🗹: Public key of the company
Q: What should an administrator use to import and export all items written using X.509
that are part of a chain of trust?
ANS 🗹🗹: Public Key Cryptography Standard (PKCS) #12
Q: Which field displays the hash, or digest, of the certificate in an X.509 certificate?
ANS 🗹🗹: thumbprint
Q: Employee B sends Employee A an encrypted message.What does Employee A use to
decrypt the message from Employee B?
ANS 🗹🗹: Employee A's private key
Q: What is an example of a symmetric algorithm?
ANS 🗹🗹: AES
Q: Which two components involved in performing encryption are known to the party
that will perform decryption before symmetric encryption is applied?Choose 2 answers.
ANS 🗹🗹: Cryptographic algorithm & Cryptographic key
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Q: 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?
ANS 🗹🗹: Employee B's public key
Q: Which type of cipher is ChaCha?
ANS 🗹🗹: stream
Q: What is the key size for RC4 with WEP?
ANS 🗹🗹: 40 bits
Q: Which symmetric encryption technique uses a 56-bit key size and a 64-bit block size?
ANS 🗹🗹: DES
Q: Which wireless security standard uses a 128-bit RC4 stream cipher for encrypted
communications?
ANS 🗹🗹: WPA
Q: What defines a prime number?
ANS 🗹🗹: Only has factors of itself and 1
Q: What is 29 mod 12?
ANS 🗹🗹: 5
Q: What happens to the hash of a file if it is rehashed after the first character of the file
is changed?
ANS 🗹🗹: The entire hash is different.
Q: What is the length (in bits) of an MD5 hash output?
ANS 🗹🗹: 128
Q: How many characters are used in an LM hash password?
C839- Cryptography Questions and Answers
(Expert Solutions)
Q: 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?
ANS 🗹🗹: Private key of the root CA
Q: 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?
ANS 🗹🗹: Public key of the company
Q: What should an administrator use to import and export all items written using X.509
that are part of a chain of trust?
ANS 🗹🗹: Public Key Cryptography Standard (PKCS) #12
Q: Which field displays the hash, or digest, of the certificate in an X.509 certificate?
ANS 🗹🗹: thumbprint
Q: Employee B sends Employee A an encrypted message.What does Employee A use to
decrypt the message from Employee B?
ANS 🗹🗹: Employee A's private key
Q: What is an example of a symmetric algorithm?
ANS 🗹🗹: AES
Q: Which two components involved in performing encryption are known to the party
that will perform decryption before symmetric encryption is applied?Choose 2 answers.
ANS 🗹🗹: Cryptographic algorithm & Cryptographic key
, Page | 2
Q: 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?
ANS 🗹🗹: Employee B's public key
Q: Which type of cipher is ChaCha?
ANS 🗹🗹: stream
Q: What is the key size for RC4 with WEP?
ANS 🗹🗹: 40 bits
Q: Which symmetric encryption technique uses a 56-bit key size and a 64-bit block size?
ANS 🗹🗹: DES
Q: Which wireless security standard uses a 128-bit RC4 stream cipher for encrypted
communications?
ANS 🗹🗹: WPA
Q: What defines a prime number?
ANS 🗹🗹: Only has factors of itself and 1
Q: What is 29 mod 12?
ANS 🗹🗹: 5
Q: What happens to the hash of a file if it is rehashed after the first character of the file
is changed?
ANS 🗹🗹: The entire hash is different.
Q: What is the length (in bits) of an MD5 hash output?
ANS 🗹🗹: 128
Q: How many characters are used in an LM hash password?
