What Is Post-Quantum Cryptography?

Post-Quantum Cryptography Explained

Post-quantum cryptography (PQC) is the field of developing cryptographic algorithms that remain secure against attacks from quantum computers. It's arguably the most important development in cybersecurity today.

Why Existing Crypto Is Vulnerable

All current blockchains — Bitcoin, Ethereum, Solana — rely on:

• Elliptic Curve Cryptography (ECC) — used for digital signatures
• RSA — used in key exchange

A quantum computer running Shor's algorithm can break both in polynomial time. This means a sufficiently powerful quantum computer could derive private keys from public keys — stealing any crypto wallet.

NIST's Post-Quantum Standards (2024)

The US National Institute of Standards and Technology (NIST) completed its PQC standardisation process in 2024, publishing three final standards:

FIPS 203 — ML-KEM (CRYSTALS-Kyber)

Key Encapsulation Mechanism. Used for secure key exchange. Replaces Diffie-Hellman and RSA key exchange.

FIPS 204 — ML-DSA (CRYSTALS-Dilithium)

Digital signature algorithm. Replaces ECDSA for signing transactions. Based on lattice problems (Module Learning With Errors).

FIPS 205 — SLH-DSA (SPHINCS+)

Hash-based signature scheme. Extremely conservative security assumptions. Based only on hash function security.

How PQC Works: Lattice-Based Cryptography

The key insight: lattice problems (like the Shortest Vector Problem) are believed to be hard for both classical AND quantum computers. Unlike ECC/RSA, there's no known quantum algorithm that efficiently solves lattice problems.

BMIC's Implementation

BMIC implements the complete NIST PQC suite (FIPS 203/204/205) within an ERC-4337 Ethereum smart contract framework. This means BMIC wallets sign transactions with CRYSTALS-Dilithium instead of ECDSA — making them quantum-safe from day one.

BMIC is the first cryptocurrency presale to implement the full NIST PQC standard.