encfs

encfs is an open-source command-line tool used for transparently encrypting files on Linux, macOS, and other Unix-like operating systems. It creates an encrypted virtual filesystem using the FUSE (Filesystem in Userspace) module, which allows the encryption and decryption of files on-the-fly as they are accessed. This means that the encrypted files appear and can be used just like regular files, without requiring manual decryption.

Some key features of encfs include:

1. Encryption: encfs uses standard encryption algorithms, such as AES and Twofish, to encrypt files and directories individually. It ensures that data remains secure even if the storage medium is compromised.

2. Mounting: It allows users to easily mount encrypted directories to access their contents. Once mounted, the encrypted files can be accessed and modified just like any other files on the system.

3. Dynamic File System: With encfs, the encrypted filesystem dynamically grows or shrinks as files are added or removed. This means that the encrypted container takes up only as much space as the actual contents, saving storage space.

4. Zero Knowledge: encfs does not store encryption passwords or keys on the system. Users provide a passphrase during setup, which is used for encryption and decryption. It's important to remember this passphrase to ensure access to the encrypted files.

5. Cross-platform Compatibility: While primarily designed for Linux, encfs has been ported to other operating systems like macOS and FreeBSD, allowing encrypted file storage on multiple platforms.

encfs provides a flexible and user-friendly way to secure files on a system without requiring changes to the applications or file management workflows. However, it's worth noting that encfs is not considered secure against certain types of attacks, such as side-channel attacks, and may not be suitable for storing highly sensitive data.