Using the open-source NaCl cryptography library, the app encrypts all communication. You can use Threema anonymously to make end-to-end encrypted voice calls, send texts and voice messages, share videos, and even conduct polls. Sure, using an encrypted messaging app is way better than nothing - which is to say, better than Skype, Windows Messenger, or AIM - but if you’re concerned anyone could listen in to your conversations or read your messages, then a VPN provides an added layer of reassurance. If you are considering encrypted messaging, the best way to achieve the utmost privacy is to also use a private VPN connection. While no encrypted messaging app is perfect, we round up the best ones available.
Apple owns the highly regarded encrypted iMessage, but that app does not encrypt data like mobile numbers, metadata, or data stored in the cloud. For example, Facebook Messenger and WhatsApp are both encrypted and work quite well, but they are also owned by Facebook, which has a problematic historical relationship with privacy.
While there are quite a number of good encrypted apps out there, many have flaws associated with their operations, their owners, or both.
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