PPP MPPE compression (encryption)

modulename: ppp_mppe.ko

configname: CONFIG_PPP_MPPE

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>PPP MPPE compression (encryption)
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Support for the MPPE Encryption protocol, as employed by the
Microsoft Point-to-Point Tunneling Protocol.

See http://pptpclient.sourceforge.net/ for information on
configuring PPTP clients and servers to utilize this method.

source code:
drivers/net/ppp/ppp_mppe.c