A Survey on Deep Packet Inspection for Intrusion Detection Systems
  Deep packet inspection is widely recognized as a powerful way which is used for intrusion detection systems for inspecting, deterring and deflecting malicious attacks over the network. Fundamentally, almost intrusion detection systems have the ability to search through packets and identify contents that match with known attacks. In this paper, we survey the deep packet inspection implementations techniques, research challenges and algorithms. Finally, we provide a comparison between the different applied systems. 
Tamer AbuHmed, Abedelaziz Mohaisen, DaeHun Nyang