Signal for iPhone: Secure, Encrypted Voice Calls Now Available
Privacy-conscious iPhone users can now enjoy free, end-to-end encrypted voice calls worldwide with Signal, the latest release from Open WhisperSystems. This app brings military-grade encryption to everyday conversations, ensuring protection against eavesdropping—compatible with its Android counterpart, RedPhone.
How Signal Works: Privacy by Design
- End-to-End Encryption: Uses the ZRTP protocol, developed by privacy pioneer Phil Zimmerman, to secure calls.
- No Hassle Setup: Works with your existing phone number—no new passwords or accounts required.
- Metadata Protection: Call metadata is discarded, further safeguarding user privacy.
- Push Notifications & AWS: Leverages push alerts for call initiation and Amazon Web Services for reliable routing.
Open-Source and Community-Driven
Signal’s code is fully open-source, with a unique incentive model: contributors earn Bitcoin for merged pull requests, funded by project donations. This approach fosters transparency and community involvement.
Future Developments
The Open WhisperSystems team—including security researcher Frederic Jacobs and engineer Christine Corbett—is also working on:
- Encrypted Text Messaging: Upcoming integration with TextSecure for Android, merging into a unified Signal app.
- Browser Extensions: Enabling secure calls from desktop devices.
Defending Against Surveillance
Signal employs ZRTP’s anti-surveillance feature: each call generates a random word pair (e.g., “hockey publisher”). Users verify these words aloud to confirm no man-in-the-middle attacks are occurring. Mismatched words indicate potential interception.
A Landmark Year for Open WhisperSystems
- $416K Knight Foundation Grant: Awarded to advance secure communication tools.
- Flock Release: A private cloud-sync service for Android contacts and calendars.
Signal represents a major leap in accessible privacy tools, combining ease of use with robust security—making encrypted communication a reality for millions.
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