Binary package “fscrypt” in ubuntu bionic

Tool for managing Linux filesystem encryption

 fscrypt is a high-level tool for the management of Linux filesystem
 encryption. This tool manages metadata, key generation, key wrapping, PAM
 integration, and provides a uniform interface for creating and modifying
 encrypted directories.
 .
 To use fscrypt, you must have a filesystem with encryption enabled and a
 kernel that supports reading/writing from that filesystem. Currently, ext4,
 F2FS, and UBIFS support Linux filesystem encryption.