Say "hello" to a different messaging experience. An unexpected focus on privacy, combined with all of the features you expect.
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Cellebrite makes software to automate physically extracting and indexing data from mobile devices. They exist within the grey – where enterprise branding joins together with the larcenous to be called “digital intelligence.” Their customer list has included authoritarian regimes in Belarus, Russi...
Last week, we received the following email from Amazon: From: [redacted], [redacted] <[redacted]@amazon.com> Subject: Notification of potential account suspension regarding AWS Service Terms Moxie, Yesterday AWS became aware of your GitHub and Hacker News/ycombinator posts des...
Just over a week ago, we announced that Iranian censors had started blocking all Signal traffic in the country. As an interim solution to help people in Iran get connected again, we’ve added support in Signal for a simple TLS proxy that is easy to set up, can be used to bypass the network block, ...
In collaboration with Signal, Microsoft is introducing a Private Conversations feature in Skype, powered by Signal Protocol.
We are excited to announce a significant advancement in the security of the Signal Protocol: the introduction of the Sparse Post Quantum Ratchet (SPQR). This new ratchet enhances the Signal Protocol’s resilience against future quantum computing threats while maintaining our existing security guar...
At Signal, we’ve been thinking about the difficulty of private contact discovery for a long time. We’ve been working on strategies to improve our current design, and today we’ve published a new private contact discovery service. Using this service, Signal clients will be able to efficiently and s...
In the midst of world-wide protests against racism and police brutality, a lot of people are becoming more immediately aware and concerned about the security of their data and online communication. We’ve gotten a lot of questions at Signal over the past week, so we wanted to briefly recap how it ...
Signal released end-to-end encrypted group calls a year ago, and since then we’ve scaled from support for 5 participants all the way to 40. There is no off the shelf software that would allow us to support calls of that size while ensuring that all communication is end-to-end encrypted, so we bui...
2020 has seen its fair number of challenges and changes. We’ve all adapted to new ways of staying in touch, getting work done, celebrating birthdays and weddings, and even exercising. As more and more of our critical and personal moments move online, we want to continue to provide you with new wa...
Groups are inherently social, and Signal is a social app. Whether you’re planning a surprise party, discussing last night’s book club meeting, exchanging photos with your family, or organizing something important, group messaging has always been a key feature of Signal. Signal provides private gr...
In addition to the end-to-end encryption that protects every Signal message, the Signal service is designed to minimize the data that is retained about Signal users. By design, it does not store a record of your contacts, social graph, conversation list, location, user avatar, user profile name, ...
The Signal Protocol is a set of cryptographic specifications that provides end-to-end encryption for private communications exchanged daily by billions of people around the world. After its publication in 2013, the Signal Protocol was adopted not only by Signal but well beyond. Technical informat...
At Open Whisper Systems, we’ve been developing open source “consumer-facing” software for the past four years. We want to share some of the things we’ve learned while doing it. As a software developer, I envy writers, musicians, and filmmakers. Unlike software, when they create something, it is...