# Quantum Security

Zenko Layer 1 is being developed with native support for **quantum-resistant cryptography**, addressing a critical and often overlooked vulnerability in current blockchain infrastructure. Most public blockchains today rely on cryptographic primitives such as **ECDSA** (Elliptic Curve Digital Signature Algorithm) and **RSA**, both of which are vulnerable to **Shor’s algorithm** — a quantum computing method capable of breaking their underlying mathematical assumptions in polynomial time.

Zenko takes a forward-compatible approach by embedding quantum-resilient systems into the chain’s core cryptographic stack, ensuring long-term integrity, wallet safety, and governance protection.

#### Threat Model

* **Signature Forgery**: Quantum adversaries could derive private keys from public keys exposed during on-chain interactions (e.g., when sending a transaction).
* **Retroactive Exploits**: Even if powerful quantum computers are years away, adversaries can harvest and store public keys today, then use future quantum capabilities to exploit historical data.
* **Multisig and DAO Risk**: Multisignature wallets, DAO contracts, and smart contracts relying on classical key aggregation are particularly vulnerable to quantum compromise.
* **Validator Attacks**: Consensus validators signing blocks with non-quantum-hardened keys may expose chain-level governance and consensus integrity.

#### Zenko’s Mitigation Strategy

**1. Post-Quantum Signature Schemes**

Zenko will support **quantum-secure signature algorithms** at the protocol level, such as:

* **CRYSTALS-Dilithium** (NIST finalist)
* **Falcon** (lattice-based, suitable for compact signatures)
* **Hash-based schemes** (e.g., XMSS or SPHINCS+) for cold storage applications

These algorithms are resistant to known quantum attacks and are part of the NIST post-quantum cryptography standardization effort.

**2. Dual-Key Account Infrastructure**

User accounts will support dual-key structures:

* **Classical Key Pair** (e.g., ECDSA/secp256k1) for legacy compatibility
* **Quantum-Resistant Key Pair** for signing future transactions and recovering assets

During the migration period, both key types can co-exist with support for **gradual key rotation** and fallback mechanisms to quantum-safe paths.

**3. Quantum-Hardened Validator Keys**

All validator nodes on Zenko will be required to operate using **post-quantum secure validator keys** as a protocol-enforced requirement. Consensus messages, block signatures, and vote attestations will be verifiable using lattice-based or hash-based schemes.

This ensures that no critical consensus function remains vulnerable to private key recovery or signature forgery.

**4. ZK-SNARK-Compatible Attestation**

Zenko will support zero-knowledge proofs for attestations and quantum-safe signature verification, allowing off-chain generation of complex post-quantum cryptographic logic that can be verified on-chain without revealing internal structure.

This reduces the cost and size limitations typically associated with quantum-safe algorithms.

**5. Future-Proofing Governance**

Zenko’s DAO voting mechanisms will adopt **quantum-resistant voter authentication**, allowing governance participants to submit proposals and cast votes securely without exposing classical cryptographic weaknesses.

Multi-sig treasuries and upgrade permissions will migrate to quantum-safe schemes as part of the validator onboarding roadmap.