Resist Intruders´ Manipulation via Context-Based TCP/IP Packet Matching

Stepping-stone is the most popular way used to attack other computers. The reason is that intruders can be protected through a long connection chain involving some compromised computers called stepping-stones. Some intruders even manipulate a stepping-stone to evade stepping-stone intrusion detection. Intruders´ evasion makes detecting stepping-stone intrusion more difficult. In this paper, we propose a new approach, context-based TCP/IP packet matching, to detect stepping-stone intrusion, as well as resisting intruders´ evasion. The analysis shows that this approach can resist intruders´ time-jittering evasion. The simulation results showed even an intruder could chaff a connection with chaff-rate as high as 100%, this approach can still match the two connections to detect the intrusion and to resist intruders´ chaff-perturbation evasion.