3) Cryptography and Encryption Solutions

Mike is sending David an encrypted message using a symmetric encryption algorithm. What key should he use to encrypt the message?

• Mike's public key

• Mike's private key

• David's public key

• Shared secret key

Shahla recently discovered an attack where the attacker managed to force a network user to use weak encryption and was then able to decrypt that content. What term best describes this attack?

• Downgrade

• Collision

• Homomorphic encryption

• Birthday attack

Norm is using full-disk encryption technology to protect the contents of laptops against theft. What goal of cryptography is he attempting to achieve?

• Integrity

• Non-repudiation

• Authentication

• Confidentiality

Brian discovers that a user suspected of stealing sensitive information is posting many image files to a message board. What technique might the individual be using to hide sensitive information in those images?

• Steganography

• Homomorphic encryption

• Replay attack

• Birthday attack

Which one of the following statements about cryptographic keys is incorrect?

• All cryptographic keys should be kept secret.

• Longer keys are better than shorter keys when the same algorithm is used.

• Asymmetric algorithms generally use longer keys than symmetric algorithms.

• Digital certificates are designed to share public keys.

What type of cipher operates on one character of text at a time?

• Block cipher

• Bit cipher

• Stream cipher

• Balanced cipher

Vince is choosing a symmetric encryption algorithm for use in his organization. He would like to choose the strongest algorithm from these choices. What algorithm should he choose?

• A. DES

• B. 3DES

• C. RSA

• D. AES

Kevin is configuring a web server to use digital certificates. What technology can he use to allow clients to quickly verify the status of those certificates without contacting a remote server?

• CRL

• OCSP

• Certificate stapling

• Certificate pinning

Acme Widgets has 10 employees and they all need the ability to communicate with one another using a symmetric encryption system. The system should allow any two employees to securely communicate without other employees eavesdropping. If an 11th employee is added to the organization, how many new keys must be added to the system?

• 1

• 2

• 10

• 11

Referring to the scenario in question 9, if Acme Widgets switched to an asymmetric encryption algorithm, how many keys would be required to add the 11th employee?

• 1

• 2

• 10

• 11