17.1 Encryption & Protocols and Digital Certs. Cambridge iA 9618

What is the purpose of encryption?

• To convert plaintext into ciphertext for security

• To convert binary code into text

• To execute secure programs

• To compress files for faster transfer

Which of the following best describes symmetric key encryption?

• The same key is used for both encryption and decryption

• A public key encrypts and a private key decrypts

• Different keys are used for encryption and decryption

• No key is required for decryption

Which encryption method uses two keys: one for encryption and one for decryption?

• Asymmetric encryption

• Symmetric encryption

• Hashing

• Digital certificates

Which of the following is a key advantage of asymmetric encryption?

• It allows secure communication without sharing a secret key

• It encrypts data faster than symmetric encryption

• It does not require a public key

• It does not require decryption

In asymmetric encryption, what does a sender use to encrypt a private message to a recipient?

• The recipient’s public key

• The sender’s private key

• The recipient’s private key

• A symmetric key

What is the main disadvantage of symmetric key encryption?

• The key must be securely shared between sender and recipient

• It requires a long key length to be effective

• It cannot encrypt large amounts of data

• It does not work with digital certificates

Which of the following statements about a public key is true?

• It is shared openly and used for encryption

• It must be kept secret and used for decryption

• It is only used in symmetric encryption

• It is used to decrypt messages

What is the purpose of quantum cryptography?

• To provide unbreakable encryption using quantum principles

• To speed up traditional encryption methods

• To replace SSL/TLS protocols

• To reduce key size in symmetric encryption

Which of the following is a benefit of quantum cryptography?

• It is theoretically immune to decryption by conventional computers

• It requires less processing power than traditional encryption

• It eliminates the need for public and private keys

• It works without any physical hardware

What is a major drawback of quantum cryptography?

• It requires specialized quantum hardware

• It cannot be used over long distances

• It does not support asymmetric encryption

• It is less secure than traditional encryption