Delta Chat, a popular messaging app with over 100,000 downloads on Google Play, has once again refused to cooperate with Russian authorities in providing access to user data and decryption keys.
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Delta Chat just a clever chat interface over SMTP/IMAP, and thusly every user can use their own mail server for sending + receiving messages. Any encryption is between the end devices, and to cooperate, they’d have to produce a compromised build that leaks those keys.