Threema 5.0 for Android

New: end-to-end encrypted group calls (audio and video)

New: agree/disagree feature also available in group chats

New: edit received images on the fly and send them right back (tap and hold > pencil icon)

New: send and receive messages with Perfect Forward Secrecy

Support for new chat server protocol

Minor bug fixes

Security improvements:

Improve chat server authentication protocol to prevent a payload confusion and a theoretical replay issue

Introduce an additional warning message if a connection from another device using the same Threema ID has been detected since the last time that the app was used

Disable compression of Threema Safe backups to rule out the theoretical possibility of a compression oracleThanks to Kenny Paterson, Matteo Scarlata and Kien Tuong Truong of the Applied Cryptography Group at ETH Zurich for bringing these issues to our attention