Saudi telco asks Moxie Marlinspike to help to build a mobile spying system

Apparently Saudi based telecom operator, Mobily, has been busy buiilding a system for intercepting mobile communications including Twitter, Viber and Whatsapp. They approached world famous Moxie Marlinspike for help and in a blog post, Moxie relates the correspondence he had with Yasser D. Airuhaily, executibve manager of network information security at Mobily: