Boxcryptor

Boxcryptor is designed to protect sensitive data stored in cloud storage services by providing a robust layer of end-to-end and zero-knowledge encryption. This tool integrates with a wide range of cloud providers, including Google Drive, Dropbox, OneDrive, and iCloud, among others.

Technically, Boxcryptor encrypts files locally on the user's device before they are uploaded to the cloud. It uses AES and RSA encryption algorithms to ensure strong security. The software operates by creating a virtual drive that acts as a layer on top of the existing cloud storage folders, allowing users to view, edit, and save encrypted files in real-time. Files are encrypted automatically when added to designated encrypted folders, and the software adds an _encrypted suffix to file names to prevent sync conflicts during the synchronization process with the cloud provider.

Operationally, Boxcryptor requires users to sign in with their account credentials, and it supports multi-device encryption, although the free plan is limited to two devices and one cloud service. The software is available on various platforms, including Windows, macOS, Linux, iOS, and Android. However, it is important to note that Boxcryptor no longer allows new account creations or purchases due to its acquisition by Dropbox, which may impact long-term support and functionality for existing users.

Key considerations include the need for careful password management, as Boxcryptor is a zero-knowledge encryption solution and cannot restore lost passwords, resulting in irretrievable data loss if the password is forgotten. Additionally, while Boxcryptor offers strong encryption, it does not provide a solution for encrypting files directly in the cloud without a local encrypted copy, which can be a limitation for some use cases.