Whisper Systems

Whisper Systems
Name	Whisper Systems
Type	Private
Industry	Mobile software, Security
Founded	2010
Founders	Moxie Marlinspike, Stuart Anderson
Fate	Acquired by Twitter (2011); later re-emerged projects
Headquarters	San Francisco, California

Whisper Systems was an American technology company focused on mobile security software and encrypted communications for smartphones. Founded in 2010 by cryptographer Moxie Marlinspike and entrepreneur Stuart Anderson, the company developed applications and libraries aimed at securing voice, text, and data on mobile platforms such as Android (operating system) and BlackBerry. Whisper Systems attracted rapid attention from technology press, privacy advocates, and major platform vendors before being acquired in 2011.

History

Whisper Systems was founded in 2010 in San Francisco by Moxie Marlinspike and Stuart Anderson following Marlinspike's work on SSLstrip and research into vulnerabilities in TLS and XMPP. The company quickly released a suite of tools for Android (operating system) and BlackBerry devices, gaining coverage from outlets such as Wired (magazine), The New York Times, TechCrunch, and The Guardian. In late 2011 Whisper Systems was acquired by Twitter, leading to the open-sourcing of several projects and the departure of some staff who later contributed to initiatives associated with Open Whisper Systems and the development of the Signal protocol. The founders and alumni subsequently influenced work at organizations including Open Whisper Systems, TextSecure, RedPhone, and various privacy-focused groups.

Products and Technologies

Whisper Systems produced a portfolio of mobile security products including RedPhone, TextSecure, and WhisperCore (a mobile hardening solution). RedPhone provided encrypted voice calling using technologies related to ZRTP and other secure-voice protocols, while TextSecure implemented end-to-end encrypted messaging using techniques rooted in Off-the-Record Messaging protocol and asymmetric cryptography. WhisperCore aimed to harden Android (operating system) devices by offering full-disk encryption, secure boot concepts, and a hardened recovery environment, paralleling work seen in Google (company)'s later device security efforts. The company also released libraries and documentation that influenced implementations in Signal (software), WhatsApp Messenger, and other private messaging services.

Security and Cryptography

Whisper Systems' engineering emphasized authenticated encryption, forward secrecy, and key management, drawing on primitives from RSA (cryptosystem), Diffie–Hellman key exchange, and AES. The TextSecure lineage contributed to modern ratcheting protocols and influenced the design of the Signal Protocol. RedPhone's approach to securing voice channels intersected with research in Secure Real-time Transport Protocol and end-to-end voice encryption exemplified by Zfone. The company published research and code that engaged with standards and tools used by practitioners at IETF, OpenSSL, and academic venues such as conferences organized by USENIX and ACM SIGCOMM.

Business and Ownership

Initially funded via private investment and revenue from enterprise customers, Whisper Systems operated as a private startup in San Francisco. In 2011 the company was acquired by Twitter, which sought to improve platform security and mobile offerings. Post-acquisition, core projects were released as open-source under stewardship that included contributors from Open Whisper Systems and independent developers. Some former employees and founders later collaborated with organizations such as Mozilla Foundation, Electronic Frontier Foundation, and startups focused on privacy and secure communications. The acquisition and subsequent community stewardship exemplify transitions between commercial startups and open-source governance models similar to histories of projects associated with Android (operating system) and Linux.

Reception and Impact

Whisper Systems received attention from technology journalists at Wired (magazine), The Verge, Wired UK, and CNET for addressing surveillance concerns raised by leaks and reporting in outlets like The Guardian. Privacy organizations such as the Electronic Frontier Foundation and civil liberties advocates commented on the significance of mobile encryption tools in debates also involving Edward Snowden disclosures and public discussions in forums like DEF CON. The technical work influenced major messaging platforms including WhatsApp Messenger, Facebook's messaging products, and independent projects like Signal (software), contributing to a broader trend of default end-to-end encryption across consumer services. Academics at institutions such as Massachusetts Institute of Technology, Stanford University, and University of California, Berkeley have cited the lineage of Whisper Systems' tools in research on usable security and secure messaging.

Legal and Policy Issues

Whisper Systems' emphasis on strong encryption intersected with policy debates involving law enforcement, export controls, and surveillance legislation. Discussions around the company's tools paralleled global regulatory debates involving entities like the United States Department of Justice, debates in the United Kingdom about encryption access, and legal cases that shaped technology policy in jurisdictions represented by legislatures such as the United States Congress and the European Parliament. Nonprofit organizations including the Electronic Frontier Foundation and Access Now engaged in advocacy related to the rights and restrictions surrounding deployment of end-to-end encryption, a context in which Whisper Systems' products were frequently cited by commentators and policymakers.

Category:Computer security companies Category:Cryptographic software