disk encryption support - suspend mode integration

 Cryptsetup provides an interface for configuring encryption on block
 devices (such as /home or swap partitions), using the Linux kernel
 device mapper target dm-crypt. It features integrated Linux Unified Key
 Setup (LUKS) support.
 .
 This package provides suspend mode integration for cryptsetup. It takes
 care of removing LUKS master key from memory before system suspend.
 .
 Please note that the suspend mode integration is limited to LUKS devices
 and requires systemd. Moreover, this is an early implementation and may not
 be as mature as the other cryptsetup-* packages yet.