Chapter 17 - Part 1

What is the primary purpose of encryption?

• To make data readable for everyone

• To alter data into an unreadable form for unauthorized parties

• To store data in a database

• To compress data for faster transmission

What is plaintext?

• A type of encryption algorithm

• The original data being sent

• A method of key distribution

• The encrypted form of data

Which of the following is a characteristic of symmetric encryption?

• The same key is used for both encryption and decryption

• It uses two different keys for encryption and decryption

• It requires a public key to encrypt data

• It is immune to eavesdropping

What is a major drawback of symmetric encryption?

• It cannot be used for large data sets

• The key must be securely shared between sender and receiver

• It is not suitable for real-time communication

• It is too slow for practical use

What does asymmetric encryption use to secure data?

• A complex algorithm only known to the sender

• A single secret key

• Two keys: a public key and a private key

• A shared password between users

What is the purpose of quantum key distribution (QKD)?

• To create a public key for all users

• To ensure secure transmission of encryption keys

• To provide a backup for lost keys

• To compress data for faster transmission

Which of the following is NOT a main security concern for data transmission?

• Speed

• Confidentiality

• Integrity

• Authenticity

What happens if an eavesdropper tries to intercept quantum bits (qubits)?

• The transmission speed increases

• The keys are automatically deleted

• The quantum states are disturbed, causing mismatches

• The data becomes more secure

What is a benefit of quantum cryptography?

• It is less expensive than traditional methods

• It is based on mathematical assumptions

• It requires no special hardware

• It is immune to attacks from advanced computers

What is a disadvantage of quantum cryptography?

• It does not require a dedicated line

• It can be implemented using standard hardware

• It is free to use

• It has a limited range of about 250 km