Provided by: systemd_229-4ubuntu4_amd64
systemd-cryptsetup@.service, systemd-cryptsetup - Full disk decryption logic
systemd-cryptsetup@.service is a service responsible for setting up encrypted block devices. It is instantiated for each device that requires decryption for access. systemd-cryptsetup@.service will ask for hard disk passwords via the password agent logic, in order to query the user for the password using the right mechanism at boot and during runtime. At early boot and when the system manager configuration is reloaded this /etc/crypttab is translated into systemd-cryptsetup@.service units by systemd-cryptsetup-generator(8).
systemd(1), systemd-cryptsetup-generator(8), crypttab(5), cryptsetup(8)
1. password agent logic http://www.freedesktop.org/wiki/Software/systemd/PasswordAgents