Protocol Reverse Engineering to Facebook Messages

In this paper, we will present the results of protocol reverse engineering for Facebook protocol, which includes Facebook message format and its exchange sequences. In order to learn message exchange sequences, we will rely on passive traffic monitoring approach which is based on packet capturing and behavior analysis. And Facebook message formats are deduced from the source program code trace on a test Facebook client that was developed for generating probing messages based on Facebook open Graph API. Deduced Facebook message formats are described in the form of constraint HTTP message specification, and Facebook message exchange sequences are depicted in sequence diagrams with objects of the Facebook client and Facebook servers.