While most services rely on traditional encryption, Signal has already prepared for the quantum era. It was the first major platform to roll out PQXDH post‑quantum key exchange based on NIST‑standardized CRYSTALS‑Kyber, paired with the SPQR sparse post‑quantum ratchet. This protects communications not only against today’s attacks, but also against “harvest now, decrypt later” threats ... https://signal-nl.com/