Bitcoin Private Keys Face Quantum Security Risk, Warns Fidelity
Fidelity Digital Assets has published an analysis warning that Bitcoin's private key protections may eventually require replacement or supplementation due to the risk of quantum computers.
The researchers point out that cryptographically relevant quantum computers do not currently exist, but sufficiently capable systems could undermine the mathematical assumptions securing transaction authorization and place funds at risk.
The study focuses on the potential vulnerability of Bitcoin's private keys to attacks from quantum computers. It highlights that most standard Bitcoin transactions use the Elliptic Curve Digital Signature Algorithm or Schnorr signatures, which rely on the difficulty of solving the elliptic curve discrete logarithm problem with classical computers.
A sufficiently powerful quantum computer running Shor's algorithm could solve this problem and derive private keys from corresponding public keys. Research has reduced some estimates for the resources needed to attack elliptic-curve cryptography, bringing the Bitcoin quantum-security debate into greater focus.