Signal Support: E2E encryption on by default, no unencrypted mode

Source documentation Strength strong

"Privacy isn't an optional mode — it's just the way that Signal works." All messages, calls, video calls, Stories, and profiles are E2E encrypted by default using the Signal Protocol. After removing SMS support on Android (2023), there is no unencrypted mode. Post-quantum SPQR enhancement announced October 2025.

URL https://support.signal.org/hc/en-us/articles/360007320391-Is-it-private-Can-I-trust-it

Published January 1, 2024

Added March 22, 2026