Quantum Vulnerability Scanner
Enter a wallet address to assess its quantum risk. Free, instant, no sign-up required.
Harvest Now, Decrypt Later (HNDL)
NOW
Your Keys Are Public
Every transaction exposes your public key on-chain.
COLLECT
Adversaries Harvest Data
Nation-states are archiving encrypted blockchain traffic today.
QUANTUM
Quantum Computers Arrive
Experts estimate cryptographically relevant quantum by 2030-2035.
DECRYPT
Keys Are Broken
ECDSA signatures become trivially reversible. Funds at risk.
How the Quantum Vulnerability Scanner Works
The QuantumSafe Quantum Vulnerability Scanner is a free tool that analyzes Ethereum wallet addresses for quantum risk indicators. It examines publicly available on-chain data to determine how vulnerable a wallet is to future quantum computing attacks — specifically the Harvest Now, Decrypt Later (HNDL) threat model.
What the Scanner Evaluates
- Public Key Exposure: Has the wallet sent any transactions? Each outbound transaction permanently reveals the ECDSA public key on-chain, making it a target for Shor's algorithm on a future quantum computer.
- Transaction Count: More transactions mean more on-chain signatures. While a single exposed transaction is sufficient for a quantum attack, higher transaction counts increase confidence in key derivation.
- Balance at Risk: The total value held in the wallet determines the economic incentive for an attacker. High-value wallets are prioritized targets.
- Nonce Patterns: Certain nonce reuse patterns can weaken ECDSA security even against classical computers, compounding the quantum risk.
Understanding Your Risk Score
| Score | Rating | Recommended Action |
|---|---|---|
| 0–20 | Low | Minimal exposure. Monitor and begin planning PQC migration. |
| 21–40 | Moderate | Some exposed transactions. Generate PQC keys and create hybrid attestation. |
| 41–60 | High | Significant exposure. Prioritize PQC key generation and plan asset migration. |
| 61–100 | Critical | Heavy exposure with high value. Immediate migration recommended. |
What To Do After Your Scan
- Generate PQC Keys: Create quantum-resistant key pairs using ML-DSA-65 or SLH-DSA alongside your existing ECDSA keys.
- Create Hybrid Attestation: Link your ECDSA wallet to your new PQC key pair, establishing verifiable ownership continuity.
- Plan Migration: Follow our ECDSA-to-PQC migration guide to transition your assets to quantum-safe addresses.