Security Signal 'fills in the gaps' for quantum-secure messaging Update to Signal Protocol should protect past and future messages from any quantum-computer-wielding hacker. Noah Bovenizer Oct 03, 2025 - 2 min read Image credit: https://unsplash.com/@thephotochad Get the full story: Subscribe for free Join peers managing over $100 billion in annual IT spend and subscribe to unlock full access to The Stack’s analysis and events. Subscribe now Already a member? Sign in