User-controlled decryption operations icon

User-controlled decryption operations

Erik Nellessen
Security Science & Education
Version
0.1.5
Size
268.9 KB
Requires
Android API 19+
4.1 / 5 · 6,758 ratings 0 downloads

Updated Sep 22, 2026

Quick answer

Emulates a smart card and lets you control the decryption operations

F-Droid repository metadata

This software enables you to transparently encrypt your Dropbox folder on your PC. It also lets you confirm the decryption operations on an Android smartphone, which is used as an NFC-enabled token. Additionally, it supports sharing files with other Dropbox users, while still encrypting the shared data. To really use the app, you also need to install the encrypting program on your PC. It can be found in the source code repository.

What’s new

How to install

  1. Download the APK from the button at the top of this page.
  2. Allow “Install unknown apps” for your browser or file manager only, not for every app.
  3. Open the downloaded file and confirm the installation.
  4. If installation fails with “App not installed,” remove an earlier build of the same app first. A signature conflict is the usual cause.

Data safety

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  • The permissions each app requests are listed on its own page.
  • Read the full safety policy for how we test, flag, and delist files.

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