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Signal (software)

Signal (software)

Signal is an encrypted communications platform for Android and iOS and is focused on secure communications.

Signal is a cross-platform centralized encrypted instant messaging service developed by the non-profit Signal Foundation and Signal Messenger LLC. Users can send one-to-one and group messages, which can include files, voice notes, images and videos. It can also be used to make one-to-one and group voice and video calls, and the Android version can optionally function as an SMS app.

Signal uses standard cellular telephone numbers as identifiers and secures all communications to other Signal users with end-to-end encryption. The client software includes mechanisms by which users can independently verify the identity of their contacts and the integrity of the data channel.

Signal's software is free and open-source. Its mobile clients are published under the GPL-3.0-only license, while the desktop client and server are published under the AGPL-3.0-only license. The official Android app generally uses the proprietary Google Play Services (installed on most Android devices), though it is designed to still work without them installed. Signal also has an official client app for iOS and desktop programs for Windows, macOS and Linux (although registration requires an iOS or Android device).

The non-profit Signal Foundation was launched in February 2018 with initial funding of $50 million from Brian Acton. As of January 2021, Signal had more than 105 million total downloads, and the platform had approximately 40 million monthly active users. Signal has been installed on more than 100 million Android devices.

Timeline

April 6, 2021
Signal adds a payments feature—with a privacy-focused cryptocurrency

Patents

Further Resources

Title
Author
Link
Type
Date

News

Title
Author
Date
Publisher
Description
Dan Riskin
March 19, 2021
W5
If aliens are sending us signals, are we set up to detect them? Dan Riskin speaks with planetary scientists, radio astronomers, and computer scientists who explain how the search for ET has ramped up in the last few decades. But if they're successful, is there a way to predict what alien creatures might look like?
March 21, 2021
The Indian Express
Check out these top five Signal features that you should be using on the app.
The Associated Press
March 16, 2021
CTVNews
Encrypted messaging app Signal appears to have been blocked in mainland China, the latest foreign social media service to cease working in a country where the government tightly controls the flow of information.
AP | PTI
March 16, 2021
@bsindia
Users in China said Tuesday that they could not get the app to connect without a VPN service
ZEN SOO AP Technology Writer
March 16, 2021
ABC News
Encrypted messaging app Signal appears to have been blocked in mainland China, the latest foreign social media service to cease working in a country where information is tightly controlled by the government
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References

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