Developer's Guide: Migrating from RSA to ML-KEM-768

Lattice-based cryptography is the standard chosen by NIST to secure communication tunnels against quantum intrusion. ML-KEM (derived from Kyber) provides a secure, post-quantum key encapsulation mechanism.

For developers, this means replacing asymmetric RSA key generation cycles. Here is how typical legacy keys are replaced.

Before (Legacy RSA in Node.js):

const crypto = require('crypto');

// Vulnerable to Shor's algorithm
const { publicKey, privateKey } = crypto.generateKeyPairSync('rsa', {
  modulusLength: 2048,
});

After (ML-KEM-768 via a FIPS 203 implementation):

const { ml_kem768 } = require('@noble/post-quantum/ml-kem');

// Post-quantum secure lattice keys (FIPS 203)
const { publicKey, secretKey } = ml_kem768.keygen();

Performance & Memory Considerations

ML-KEM keys and ciphertexts are considerably larger than classical ECC keys. While ECC keys might only be 32 bytes, ML-KEM-768 public keys span 1,184 bytes, and ciphertexts span 1,088 bytes.

Developers must ensure database schemas, TLS header buffers, and communication packets accommodate these larger sizes without failing.