libkeyutils1 1.5.9-9.2ubuntu2 (amd64 binary) in ubuntu bionic

 Keyutils is a set of utilities for managing the key retention facility in the
 kernel, which can be used by filesystems, block devices and more to gain and
 retain the authorization and encryption keys required to perform secure
 operations.
 .
 This package provides a wrapper library for the key management facility system
 calls.