Post‑quantum chat by default

Signal is baking quantum‑resistant cryptography into its protocol so users get protection against future decryption without changing behavior. This anticipates 'harvest‑now, decrypt‑later' tactics and preserves forward secrecy and post‑compromise security, according to Signal and its formal verification work. — If mainstream messengers adopt post‑quantum defenses, law‑enforcement access and surveillance policy will face a new technical ceiling, renewing the crypto‑policy debate.