Quantum Computing and Its Impact on Cryptography

1. What is a qubit?

A) A type of encryption algorithm.
B) A software language for quantum programming.
C) A basic unit of quantum information.
D) A classical bit used in regular computing.

2. How does quantum superposition differ from classical superposition?

A) Classical superposition involves physical waves.
B) Quantum superposition only applies to photon states.
C) Quantum superposition allows qubits to be in multiple states simultaneously.
D) Classical superposition is more stable.

3. Which classical public-key encryption algorithm is vulnerable to quantum attacks?

A) Diffie-Hellman
B) AES
C) SHA-256
D) RSA

4. Which quantum algorithm is used for searching unsorted databases faster than classical algorithms?

A) Grover's algorithm
B) Deutsch's algorithm
C) Bernstein-Vazirani algorithm
D) Shor's algorithm

5. What is post-quantum cryptography?

A) Cryptography that only quantum computers can decrypt.
B) Cryptography that runs on quantum networks.
C) Cryptography used after a successful quantum encryption.
D) Cryptography designed to be secure against quantum attacks.

6. What is the term for a quantum computer's ability to perform many calculations simultaneously?

A) Quantum interference
B) Quantum superposition
C) Quantum entanglement
D) Quantum parallelism

7. What is the theoretical advantage of quantum computers over classical ones in terms of solving certain problems?

A) Linear speedup for all algorithms.
B) Better at solving purely mathematical problems.
C) Faster at processing large datasets.
D) Exponential speedup for some algorithms.

8. How does quantum key distribution (QKD) ensure secure communication?

A) By continuously changing encryption keys at a fast pace.
B) By using classical encryption algorithms with quantum networks.
C) By leveraging the principles of quantum mechanics for key exchange.
D) By relying on hardware-based encryption solutions.

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