Chat Over Email
- relay messages over e-mail servers
- use MIME format for interop
- use DSNs for "sent/read" ticks
Delta privacy
- no Delta servers, no address book upload
- e2e encryption with Autocrypt by default
- "Verified groups" against MITM
Impl status
- Android fully functional (F-Droid, apk)
- iOS in preview (TestFlight with ~60 users)
- Desktop evolving (dmg, deb downloads)
developments partly funded by OpenTechFund and by the European Commission (NEXTLEAP).
DeltaChat C lib
- SMTP/IMAP interactions (libetpan)
- contact and Chat/Group management
- Autocrypt Level 1 (currently using netpgp)
- Java, Python, Javasscript, Swift bindings
- API design driven by user interfaces
OpenPGP Encryption
- fully Autocrypt Level 1 compliant
- uses a fork of netpgp with fixes
- successful experiments integrating Sequoia
- implements "countermitm" verifications
countermitm
- countering active attacks is a concern
- countermitm research adds protection
- "don't talk with users about keys, ever!"
- new: "setup contact" and "group-join"
- good feedback from users, cryptographers
Community
- 20 voluntary translations
- 10 active contributors
- collaborating with OpenExchange
- https://support.delta.chat
- https://github.com/deltachat
A cuban user :)
I'm going to confess my love for the application. It is really amazing, it has made me communicate more with my friends, because writing emails is really annoying for me, I prefer chat, the world prefers chat, that's why I am eternally grateful ...
A german user :)
ich freue mich riesig, dass es DeltaChat gibt und dass ich es entdeckt habe. (...) Delta ist DIE Lösung für alle, die bereits sind, wenigstens eine Alternative zuzulassen - Email geht immer! :)
comment after user-testing
Oh, i didn't know you can use PGP without first listening to an hour of explanations!
Future
- complete Android/UI "dev" effort
- further Desktop and iOS developments
- releasing to app stores
Delta-XI: Decentralization Unchained
one-week hackathon and user-testing sessions starting sunday Oct28 in Kyiv, Ukraine