Signal Alums Reveal ‘Encrypted Spaces,’ a System for Making Private Collaboration Apps
A cryptography group led by Signal alumni has released Encrypted Spaces, an open-source preview for building private collaboration apps.
Intelligence analysis by GPT-5.4 Mini
The project aims to bring end-to-end encryption to group tools like Slack, Discord, and Google Docs by using change logs and zero-knowledge proofs. It is a research preview, not a finished app, but it is meant to make encrypted collaboration easier for developers.
Encrypted Spaces is like giving a whole group a locked notebook that only the group can read and update. A helper on the outside can keep the notebook organized and prove nothing went missing, but still never open it.
Analysis
What was released
A team that includes people from Harvard, Microsoft Research, and former Signal developers has released a preview of Encrypted Spaces, an open-source set of libraries for building private collaboration apps. The goal is to support software that looks more like Slack, Discord, or Google Docs than a simple two-person chat, while still keeping the content encrypted from servers and outsiders.
How it works
The project tackles a basic problem in end-to-end encryption: once many people are editing shared data, the server cannot see the contents and therefore cannot freely manage that data the way a normal collaboration platform would. Encrypted Spaces addresses this with a shared change log that records updates to encrypted data. Each user’s device applies those changes locally, while the server uses zero-knowledge proofs to show that no updates are missing and no unauthorized changes were inserted.
Trevor Perrin, who co-created the Signal protocol, says the system can also use a roll-up property of zero-knowledge proofs to compress the history into a proof of the current state. The server can prove it handled the log correctly without sending the whole log itself.
What developers get
The release is not a finished app. It is a code repository and research preview meant for review by cryptography researchers and developers. The team says the longer-term aim is to let people build encrypted collaborative apps without needing deep cryptography knowledge. WIRED says the prototype demoed as Spaces looked like an encrypted Slack- or Discord-style app, with group notes, calendar, and file storage features, though it still lacked some functions such as voice calling and search.
Why the team thinks now is the moment
Nora Trapp of Harvard’s Applied Social Media Lab says the shift from one-to-one messaging to multiuser collaboration lines up with new cryptographic tools, especially zero-knowledge proofs. The article frames Encrypted Spaces as a possible next step beyond Signal’s messaging model: a broader architecture for encrypted collaboration rather than just encrypted chat.
Limits and concerns
The article notes that the same privacy tools could also make it harder for law enforcement to monitor criminal activity inside encrypted apps. It also makes clear that the current release is a research prototype, not something users should deploy as-is.
Key points
- Encrypted Spaces is an open-source preview for building end-to-end encrypted collaboration apps.
- It uses change logs plus zero-knowledge proofs so servers can verify updates without reading user data.
- The team includes contributors from Harvard, Microsoft Research, and former Signal developers.
- The prototype aims to support app features like group chat, notes, calendars, and file storage.
- The article says the release is for research and review, not immediate production use.
If the libraries hold up under scrutiny, developers could build private team apps much more easily than before. That could make strong encryption normal in collaboration tools, not just in messaging apps.
The system is still a research prototype, so it may be too early for real-world use. Stronger privacy in group apps could also make it harder to detect harmful activity hidden inside encrypted collaboration spaces.
