Quantum Computing and Its Impact on Cryptography

1. What is a qubit?

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

2. How does quantum superposition differ from classical superposition?

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

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

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

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

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

5. What is post-quantum cryptography?

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

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

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

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

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

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