Locally Encrypt Files for Cloud Storage

Key to the Cloud

© Lead Image © Maksim Kabakou, 123RF.com

© Lead Image © Maksim Kabakou, 123RF.com

Article from Issue 304/2026
Author(s):

Cryptomator lets you encrypt your files on your computer before syncing to the cloud, keeping your data private even from your storage provider.

Most cloud providers encrypt data only in transit (i.e., while it's travelling from your computer to their servers). Some offer encryption at rest, while it's stored on their servers, but in most cases, the provider keeps the decryption keys to themselves. This means your files could theoretically be accessed by the cloud provider, a rogue insider, or anyone who manages to compromise the provider's systems.

If this arrangement has deterred you from using online data silos, you can use Cryptomator to encrypt your data before handing it over to the cloud. This crucial step, known as client-side encryption, ensures that only you hold the key to your data, which will remain indecipherable for anyone else, be it the cloud provider or a threat actor.

Because Cryptomator is built on principles of transparency and security, you don't have to trust the application blindly. As an open source app, Cryptomator's code is publicly available for community scrutiny. In fact, Cryptomator has been independently audited to ensure it doesn't contain backdoors.

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