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Following Apple's lead with iMessage, WhatsApp rolls out end-to-end encryption for all communication - 9to5Mac
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10 Most Secure Messaging Apps for Android & iOS in 2023
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How to Make a Really Secure Messaging App Similar to Signal? - Mind Studios
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Status report for January 2020: Services on Windows 10 Mobile
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Threema. The Secure Messenger App for iPhone - Free Download Threema. The Secure Messenger for iPad & iPhone at AppPure
7 Best WhatsApp Alternatives In 2022: Privacy-Focused Messaging Apps
Threema vs Signal: Which Secure Messaging App is Right for You?
Threema secure messaging app now in closed beta for Windows Phone, slots available - MSPoweruser
News and Background Information About Threema – Blog
