1. Project Overview & Quickstart (cryptomator/cryptomator)

Supporting Cryptomator

Cryptomator is provided free of charge as an open-source project despite the high development effort and is therefore dependent on donations. If you are also interested in further development, we offer you the opportunity to support us:

Gold Sponsors

Silver Sponsors

Special Shoutout

Continuous integration hosting for ARM64 builds is provided by MacStadium.

Introduction

Cryptomator offers multi-platform transparent client-side encryption of your files in the cloud.

Download native binaries of Cryptomator on cryptomator.org or clone and build Cryptomator using Maven (instructions below).

Features

Works with Dropbox, Google Drive, OneDrive, MEGA, pCloud, ownCloud, Nextcloud and any other cloud storage service which synchronizes with a local directory
Open Source means: No backdoors, control is better than trust
Client-side: No accounts, no data shared with any online service
Totally transparent: Just work on the virtual drive as if it were a USB flash drive
AES encryption with 256-bit key length
File names get encrypted
Folder structure gets obfuscated
Use as many vaults in your Dropbox as you want, each having individual passwords
More than Five thousand commits for the security of your data!! :tada:

Privacy

256-bit keys (unlimited strength policy bundled with native binaries)
Scrypt key derivation
Cryptographically secure random numbers for salts, IVs and the masterkey of course
Sensitive data is wiped from the heap asap
Lightweight: Complexity kills security

Consistency

Authenticated encryption is used for file content to recognize changed ciphertext before decryption
I/O operations are transactional and atomic, if the filesystems support it
Each file contains all information needed for decryption (except for the key of course), no common metadata means no SPOF

Security Architecture

For more information on the security details visit cryptomator.org.

Building

Dependencies

JDK 26 (e.g. temurin, zulu)

Run Maven

text

./mvnw clean install

This will build all the jars and bundle them together with their OS-specific dependencies under target. This can now be used to build native packages.

License

This project is dual-licensed under the GPLv3 for FOSS projects as well as a commercial license for independent software vendors and resellers. If you want to modify this application under different conditions, feel free to contact our support team.

2. Official Technical Reference & Guides (cryptomator/docs)