Toward post-quantum cryptography: the next generation of blockchains

The race toward quantum resistance is today a strategic challenge for any serious blockchain project. As quantum computers advance (IBM, Google, IonQ, etc.), the classical cryptography based on elliptic curves (Ed25519, secp256k1) used by Bitcoin, Ethereum, Solana and many others will theoretically become vulnerable against powerful quantum algorithms (Shor, Grover).

Fortunately, the blockchain ecosystem is not standing still. Several major projects are planning or already deploying post-quantum upgrades that will allow their networks to be secured even against adversaries equipped with quantum computers.

Why quantum threatens current blockchains

The security of cryptocurrencies relies on a fundamental principle: a transaction is authorized only if it is signed by a private key that matches a public key. On classical blockchains, these signatures are made with algorithms such as Ed25519 or secp256k1, and both of these standards are assumed to be difficult to break with classical computers.

But a sufficiently powerful quantum computer running Shor's algorithm could, in theory, derive a private key from a public key, thus making the current public/private key model obsolete. In this future scenario, thousands or millions of addresses could be compromised.