Post‑Quantum Crypto (Simple View)
Quantum computers powerful enough to break Bitcoin's cryptography do not exist yet and may not for decades. But Bitcoin developers are already researching quantum-resistant signature schemes — preparing defenses for a threat that has not yet materialized.
Quantum computers could one day threaten today’s signatures. Mining remains safe longer, but signatures (ECDSA) are the main concern.
Simple definitions:
- •Shor’s algorithm: Could break current signature schemes when quantum is strong enough.
- •PQ (Post‑Quantum) signatures: New kinds of signatures designed to resist quantum attacks.
- •Migration: A careful plan to move to safer signatures if/when needed.
Quantum computing is a real long-term concern but not an immediate threat. Bitcoin can upgrade its cryptography through a soft fork if needed. The community is aware of the issue and actively developing solutions.
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