Unlock luks by other device

I know that by configuring **crypttab** I can automatically unlock **LUKS** drives by using keyfile stored on another drive in the machine which has been manually unlocked in advance. I have been wondering **if a keyfile stored in a different machine/device can also be used**, accessed e.g. over ssh. **Here is what I would like to achieve.** A machine with an encrypted LUKS drive would at startup look at a particular IP address in the local network and if a device (android phone) is present, it would read a keyfile from the device and use it to unlock its drive, otherwise it would ask for password. **Are there any better approaches to this?** I have found that there exists blueproximity which does something similar for lock-screen.