security flaw
4.This article introduces the basic theory of ARP protocol,mainly analyses the theory of some network attacks using ARP security flaw and the regular attacking methods. This paper also discusses the regular methods against ARP attack,and gives an algorithm which used to defend the ARP attack,the algorithm uses the rule of "rejecting the reply without request,and using ARP packet identification". The algorithm is applicable to those LANs that need higher level of network security.
9.This article analyzed the BLP model the flaw which in the secret,the data integrity and the usability aspect existed,through repaired the level,the scope and the rule strengthens the system security,introduced the multi-examples solves the secret and the complete contradiction, caused the user to show and performs from the table to the BLP model to transform,enables the BLP model to have a higher security and the usability,was allowed to take the multistage security database management system the model.

