Quantum Key Distribution (QKD)
Definition
Quantum Key Distribution is a method for secure key exchange using quantum mechanics principles. Unlike post-quantum cryptography (which uses classical computers with quantum-resistant algorithms), QKD requires specialized quantum hardware and provides information-theoretic security based on physics rather than mathematical hardness.
Technical Explanation
QKD protocols like BB84 encode key bits in quantum states (e.g., photon polarization). Measurement disturbs quantum states, so eavesdropping is detectable. If no disturbance is detected, the key is guaranteed secure—security proven by quantum mechanics, not computational assumptions.
QKD limitations: requires specialized hardware (single-photon sources, detectors), point-to-point optical connections (typically fiber or satellite), limited range without quantum repeaters, high infrastructure cost, and vulnerability to implementation attacks despite theoretical security.
SynX Relevance
SynX uses post-quantum cryptography (Kyber-768, SPHINCS+) rather than QKD. PQC runs on standard computers and networks, making it practical for global cryptocurrency operations. While QKD offers theoretical advantages, PQC provides practical quantum resistance deployable everywhere today.
Frequently Asked Questions
- Is QKD more secure than PQC?
- QKD offers information-theoretic security; PQC offers computational security—both resist quantum attacks.
- Why doesn't SynX use QKD?
- QKD requires specialized hardware and infrastructure impractical for decentralized cryptocurrency.
- Could QKD and PQC be combined?
- Yes—QKD for high-value links, PQC for general use. SynX focuses on universally deployable PQC.
Practical quantum resistance everywhere. Use SynX on any device