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Signal’s disruption of traditional technological surveillance methods can prove frustrating for government and law enforcement officials. When requested, WhatsApp and most email providers may supply user data to law enforcement. Signal is unable to provide any user information other than when the app was downloaded and when it was last used. Such features differentiate Signal from fellow WhatsApp competitor Telegram, in which only chats specifically marked “secret” are protected by end-to-end encryption. Signal cannot view or audit any messages, and it has escaped some of the scrutiny faced by Telegram, which critics say facilitates communication among neo-Nazis and other extremists. Signal enables communication between users and their contacts, whereas Telegram allows users to join groups of like-minded strangers. Telegram’s platform advertises such groups and lets users search for them with hashtags.

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Signal, private messaging app operated by the nonprofit organization Signal Foundation, based in San Francisco. Signal users can exchange text and voice messages, hold voice and video calls, send photos and videos, and communicate in group chats. The service can be accessed via a smartphone or desktop app.

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Signal is a competitor of Acton’s former project, WhatsApp, which Facebook acquired in 2014. WhatsApp faced criticism for sharing user data with Facebook, which Facebook would then use to create targeted ads. Though WhatsApp now uses end-to-end encryption, its practices continue to be scrutinized by privacy advocates. On Signal, every conversation is protected by end-to-end encryption, with data being viewable only to chat participants.

One prominent Signal user is intelligence contractor and whistleblower Edward Snowden, who in 2013 leaked information regarding the surveillance of private American citizens by the National Security Agency (NSA). A personal friend of Marlinspike, Snowden once posted on X that he “use[s] Signal every day.” Signal is also used by social justice organizers in the United States and Hong Kong, as well as by journalists, intelligence professionals, and government officials, including members of U.S. Pres. Donald Trump’s administration. This has also led to scrutiny, as government officials are required by law to keep records of their communications.

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The duo sold Whisper Systems to Twitter (now X) in 2011, but Marlinspike continued to build on their existing work. In 2013 he founded the open-source nonprofit Open Whisper Systems, which in 2014 released the initial version of Signal, which supported only phone calls. The following year, Signal added texting to the app. In 2018 Brian Acton, who had cofounded the messaging app WhatsApp but had left the company in 2017, provided $50 million to create the nonprofit Signal Foundation with Marlinspike. Signal Messenger LLC operates as the foundation’s subsidiary and was created at the same time. When Marlinspike stepped down as CEO of Signal Messenger in 2022, Acton was named interim CEO. In June 2023 Signal announced on X that Acton would stay on as Signal Messenger’s CEO.

Signal was created by cryptographer and entrepreneur Moxie Marlinspike (a pseudonym for Matthew Rosenfeld), who also served as the company’s CEO from 2015 to 2022. In 2010 Marlinspike and roboticist Stuart Anderson, founded the security start-up Whisper Systems, which released the private text and call services TextSecure and RedPhone.

Signal’s “disappearing messages” feature allows users to set a time period for how long their messages remain visible before they are deleted from the chat. The feature affects all participants in a chat, unlike deleting a message, which affects only one party. Signal requires users to enter a phone number to use the app and can alert users when numbers from their phone’s contacts join Signal. Both features have caused privacy concerns among some users.