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Introducing Quantum Shield

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Introducing Quantum Shield

In October 2025, we launched SasaSavic Quantum Shield™—the first known publicly accessible implementation of dual-signature timestamping for quantum-resistant protection.

The Quantum Threat

Most current cryptographic systems rely on mathematical problems that are computationally hard for classical computers but trivial for quantum computers:

  • •RSA relies on integer factorization
  • •ECDSA relies on elliptic curve discrete logarithm
  • •Diffie-Hellman relies on discrete logarithm

A sufficiently powerful quantum computer could break all of these. Timestamps signed only with classical algorithms won't be verifiable in a post-quantum world.

How Quantum Shield Works

Quantum Shield creates proof-of-existence timestamps using a dual-signature approach:

  1. •Local fingerprinting — SHA-256 hash computed in your browser using the Web Crypto API. Files never leave your device.
  2. •Dual signatures — We sign with both ECDSA P-256 (classical) and NIST-standardized ML-DSA-65 (quantum-resistant).
  3. •Bitcoin anchoring — The dual-signed ledger is anchored to Bitcoin via OpenTimestamps for independently verifiable time evidence.
  4. •Open verification — Anyone can verify both signatures. Your proofs remain valid even if quantum computers break ECDSA.

Design Philosophy

Quantum Shield is built with the same principles as all Savic Labs products:

  • •100% private — Files never leave your device; only the hash is submitted
  • •Future-proof — ML-DSA-65 protects against quantum computer attacks
  • •Open verification — Independent proof verification without our involvement
  • •Bitcoin-anchored — Immutable time evidence on the blockchain

Who It's For

  • •Researchers — Timestamp findings before publication to establish priority
  • •Creators — Prove ownership of creative work with verifiable timestamps
  • •Engineers — Timestamp code commits and architecture documents
  • •Law & Compliance — Cryptographic proof for legal records and contracts

Try It Now

Quantum Shield is live at sasasavic.ca. Drop a file, and we'll create a quantum-resistant timestamp—completely free, completely private.