Quantum key cracking ________.

• A. Is a way to deliver enormously long keys to communication partners
• B. Creates a major threat to many traditional cryptographic methods
• C. Both A and B
• D. Neither A nor B

Answer: (B)

Quantum key cracking explores how quantum computing could break existing cryptographic systems. The essential point is that powerful quantum computers could run algorithms (like Shor’s) that defeat widely used public‑key schemes such as RSA, Diffie-Hellman, and ECC by solving factoring or discrete‑log problems in a feasible time. This means confidentiality and authentication in many protocols could be seriously compromised, making it a major threat to traditional cryptography. The idea of delivering enormously long keys describes a key distribution approach, not cracking; it’s not what quantum key cracking is about. So the statement that it creates a major threat best captures the concept. The combined option would only be true if both ideas were accurate, which they aren’t in this context, and the “neither” option ignores the real threat present.