SITIS: Scalable Intrusion Tolerance Middleware for Internet Service Survivability

In this paper, we present design and implementation of SITIS: a middleware for intrusion tolerance of internet service. SITIS is designed for scalable deployment of intrusion tolerant capability in essential internet services. SITIS has abnormal status monitoring and group management modules. The monitoring module gathers various system-information such as memory and processor usages, and group management module manage the server farm using several mechanism such as group leader selection, abnormal server isolation and joining of new server. Also, the voting mechanism is utilized in the group management to check the integrity of each member’s service. In our work, we developed the web server’s intrusion tolerance system using SITIS middleware and it is presented at the end of this paper.