Encryption and Digital Signatures

What is the vulnerability of key exchange in symmetric encryption?

• Exposure of public key
• Interception of the shared key
• Loss of data during transmission
• Inability to decrypt the message

How does a digital signature verify the sender of a message?

• By creating a digest of the message and encrypting it with the sender's private key
• By using a checksum algorithm on the message
• By encrypting the message with the recipient's public key
• By appending the sender's public key to the message

How does asymmetric encryption overcome the vulnerability of key exchange in symmetric encryption?

• By using a pair of mathematically related keys
• By encrypting the message with the recipient's private key
• By sharing the private key over the network
• By using a public key for encryption

What is the role of public and private keys in asymmetric encryption?

• Public key encrypts the message, private key decrypts it
• Both keys are used for encryption
• Both keys are kept secret
• Public key decrypts the message, private key encrypts it

Who issues digital certificates to verify ownership of key pairs?

• Public key servers
• Internet service providers
• Government agencies
• Certificate authorities

What is the main difference between symmetric and asymmetric encryption?

• Asymmetric encryption requires a key exchange before data transmission.
• Both parties share the same private key in symmetric encryption, while asymmetric encryption uses a pair of mathematically related keys.
• Symmetric encryption uses a public key for encryption, while asymmetric encryption uses a private key.
• Symmetric encryption is more secure than asymmetric encryption.

What is the purpose of key exchange in symmetric encryption?

• To verify the sender's identity
• To ensure secure transmission of data
• To create a digital signature
• To encrypt the message

What information does a digital certificate contain?

• Owner's private key
• Owner's name, public key, and certificate authority's digital signature
• Recipient's public key
• Expiry date of the message