Signal Security and Privacy Features

Signal’s security and privacy work spans account protection, identity verification, enrollment, and use across multiple devices.

Features such as Automatic Key Verification and key transparency help users detect changes to contacts’ encryption keys, while warnings about fake support messages, registration codes, and unfamiliar contacts address phishing and account takeover. Signal has also expanded encrypted device linking and explored registration without phone numbers, using account identifiers, optional authentication, and privacy-preserving payment methods. Together, these changes illustrate the continuing balance between stronger protection, easier access, and the risks of metadata, credential loss, or linked-device compromise.