gocryptfs – encrypted overlay filesystem written in Go

gocryptfs is an encrypted overlay filesystem. Encrypted files are stored in CIPHERDIR, and a plain-text view can be presented by mounting the filesystem at MOUNTPOINT.

gocryptfs uses file-based encryption that is implemented as a mountable FUSE filesystem. Each file in gocryptfs is stored one corresponding encrypted file on the hard disk. The screenshot below shows a mounted gocryptfs filesystem (left) and the encrypted files (right).

The encrypted files can be stored in any folder on your hard disk, a USB stick or even inside the Dropbox folder. One advantage of file-based encryption as opposed to disk encryption is that encrypted files can be synchronised efficiently using standard tools like Dropbox or rsync. Also, the size of the encrypted filesystem is dynamic and only limited by the available disk space.

gocryptfs builds on well-known cryptographic primitives: scrypt for key derivation, AES-GCM for file content encryption and, as a world’s first for encrypted filesystems, EME wide-block encryption for file name encryption.

In reverse mode, gocryptfs provides an encrypted view of a plain-text directory. The primary use-case are encrypted backups.

To make reverse mode useful, it uses deterministic encryption using AES-SIV instead of AES-GCM.

gocryptfs was inspired by encfs and strives to fix its security issues while providing good performance.

gocryptfs is free and open source software.

Features include:

  • File contents:
    • Uses scrypt for password hashing.
    • Uses GCM for encryption and integrity.
  • File names:
    • Uses EME for encrpytion.
  • Supports hard links, extended attributes, fallocate, fallocate KEEP_SIZE, and fallocate PUNCH_HOLE.

Website: nuetzlich.net/gocryptfs
Support: GitHub Code Repository
Developer: Jakob Unterwurzacher
License: MIT License

gocryptfs is written in Go. Learn Go with our recommended free books and free tutorials.

Return to Encrypted FUSE-Based File Systems | Return to Disk Encryption

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