Simple, private file storage with Proton Drive

Proton Drive provides end-to-end encrypted cloud storage, suitable for securing sensitive documents with the same kind of encryption we use to secure emails in ProtonMail and events in ProtonCalendar. We continue to build more features for Proton Drive, but the early access version is ideal for some use cases:

• Securely backing up sensitive files, such as medical records, financial documents, copies of identity documents
• Storing files with end-to-end encryption in the cloud, so you can access them from any device

End-to-end encrypted file storage

Proton Drive allows you to store your files on the Proton server network. You encrypt your files on your device, and only you (or those you authorize) can decrypt them. Files and folders are encrypted using the same PGP encryption method we use to secure ProtonMail emails.

How it works: PGP first generates a large symmetric session key, which is used to encrypt your files. This session key is then itself encrypted using an asymmetric key and a passphrase that you provide. Both the symmetric key and the password (which only you should know) are required to decrypt your data. 

Encryption and decryption occur on your device only, never on our servers. This means that no one can access files you have stored on Proton Drive (except you). However, an upcoming feature will allow you to securely share files without compromising end-to-end encryption.

Learn more: https://protonmail.com/blog/proton-drive-early-access