EnigmaMAX?
A downloadable tool
The app is currently only in German, but may be updated to include other languages. It allows you to encrypt and decrypt SMS without the use of the internet or cloud. For maximum security, it is recommended to use a SeedKey with a minimum of 12 characters. Your messages cannot be read by anyone without the key.
Feel free to give feedback.
Download
Install instructions
After installing the APK on your phone, tap the upper right corner to set your SeedKey. Tap "Speichern" to save it.
To start a new conversation, tap "Neuer Chat" and type the recipient's phone number or select them directly from your contacts.
Stay safe—this is a completely free non-profit app!
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