chapter 17 grade 12

Which of the following best describes asymmetric encryption?

• Uses one key for both encryption and decryption

• Uses two different but related keys

• Uses multiple secret keys for each session

• Cannot be used for confidentiality

If Alice wants to send a confidential message to Bob, she should encrypt it using:

• Alice’s private key

• Bob’s public key

• Bob’s private key

• Alice’s public key

The main purpose of a digital signature is to provide:

• Confidentiality

• Authentication, integrity, and non-repudiation

• Compression of data

• Fast data transmission

A hashing algorithm in digital signatures is used to:

• Encrypt the entire message

• Compress the message

• Produce a fixed-size digest from the message

• Generate public and private keys

When a digital signature is created, the digest is encrypted using the:

• Sender’s public key

• Receiver’s private key

• Sender’s private key

• Receiver’s public key

To verify a digital signature, the recipient uses the:

• Sender’s private key

• Receiver’s private key

• Sender’s public key

• Receiver’s public key

If the digests from sender and recipient do not match, it means:

• The message is confidential

• The message has been tampered with

• The private key was incorrect

• The sender is not authenticated

A digital certificate is primarily used to:

• Encrypt the message contents

• Verify the identity of the owner of a public key

• Replace the use of a digital signature

• Store passwords securely

Which organization issues digital certificates?

• Internet Service Provider

• Web Server

• Certificate Authority (CA)

• ICANN

A digital certificate contains all of the following except:

• The owner's public key

• The CA's digital signature

• The owner's private key

• Validity period