Post-quantum cryptography is essential. Current PQ signature schemes increase signature sizes by one to two orders of magnitude and significantly raise computation costs, directly conflicting with the tight size and performance constraints of existing blockchains.
Sizes: 10x - 500x larger
Computation: 10x - 100,000x more expensive
Bandwidth & storage: explode immediately
Example: Ed25519 (used by many blockchains) = 96 bytes total
Blockchain blocks are small. PQ cryptography is BIG.
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✕QUANTUM.TXT
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Q-SHA256: Standard Web Vulnerability
This website uses X25519 key exchange for TLS encryption. A sufficiently powerful quantum computer running Shor's algorithm could break this elliptic curve cryptography, exposing all encrypted traffic. Most websites today remain quantum-vulnerable until post-quantum TLS becomes standard.