Copiosus is just another P2P chat application.
This software is provided "as is" without warranties or conditions of any kind, either expressed or implied.
Please download this app only if:
- You care about security.
- You don't care about a beautiful UI.
- You like to try apps other than WhatsApp and Signal.
- Send messages.
- Send files and images.
- Block users.
- End-to-end encryption using an asymmetric key.
- Improved end-to-end security using a security key as a second factor which encrypts data using a shared symmetric key.
- Minimal privileges required.
- No in app purchases.
- No ads.
How does end-to-end encryption work in this app:
1. Whenever you send a message M a random symmetric key R is generated
2. R is encrypted using the asymmetric (public) key of the other user resulting in A
3. M is encrypted with R resulting in N
4. If security key S is set: N is encrypted by S
5. N and A is sent to the destination
* Decrypt messages when changing security key
* Support dark mode
* Bugfix: Crash when saving images
With Family Sharing set up, up to six family members can use this app.