Traditional cryptographic timestamping services rely on elliptic curve cryptography (ECDSA, EdDSA) or RSA signatures to prove the authenticity of timestamped ledgers. However, these algorithms are vulnerable to quantum computer attacks using Shor's algorithm, which can break these cryptosystems in polynomial time once sufficiently powerful quantum computers exist. The cryptographic community anticipates that quantum computers capable of breaking current public-key cryptography may emerge within 10-30 years, rendering all existing cryptographic timestamps vulnerable to forgery. Existing quantum-resistant approaches include: 1. Hash-based aggregation timestamping (e.g., Guardtime KSI with hash-chain "keyless signatures") 2. Classical-only timestamping services planning future migration 3. Solutions requiring users to re-timestamp existing proofs after migration While hash-based quantum resistance provides protection, it lacks standardized verification infrastructure and backward compatibility with existing ECDSA-based systems. No public timestamping service implements NIST-standardized post-quantum signatures (ML-DSA/Dilithium) with dual-signature architecture for seamless migration.

SasaSavic Quantum Shield™

Quantum-secure timestamping for verifiable digital proofs

Quantum-secure timestamping for verifiable digital proofs