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What’s New

Several improvements in relation to mentions
Fixed a possible bug in relation to chat exports
Fixed a bug that could cause the scroll position to jump after opening a chat again from the App Switcher
Added a “Scan QR code” option to the text input menu
For VoiceOver users, the new chat view is disabled in this version. The reported issues will be addressed and the new chat view reenabled in a future version.

Full technical and visual overhaul of the chat view
Improved in-chat search, providing all results at a glance
Past chat messages will now load automatically when scrolling (infinite scrolling)
Inline player for voice messages
Media and files can now be viewed while the sending process is ongoing
Redesign of the message detail view (accessible by swiping left on a message)
In group messages, the members’ names are now displayed in different colors
Live preview of text formatting
Improved message delivery when the app is in the background
Various bug fixes and numerous under-the-hood improvements

Text formatting is now supported in GIF captions
Fixed a bug that caused voice messages on some smartphones to be distorted
Updated the Zip4j library to the current version (fixes CVE-2023-22899)
Restoring a backup will now be cancelled if an incompatible backup file is used
Voice messages from contacts with an iOS device will now be forwarded as voice messages instead of audio files
A system notification will now be displayed if a contact downgraded to an app version that does not support Perfect Forward Secrecy
Adjustment of the data backup so that file names no longer show metadata (reported by Thore Göbel)
Other improvements and minor bug fixes

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 oracle
  Thanks to Kenny Paterson, Matteo Scarlata and Kien Tuong Truong of the Applied Cryptography Group at ETH Zurich for bringing these issues to our attention

See all changes on GitHub.