Patent ID: 7822976

Claim:
A network data security system, comprising: a client; an authentication dispatching server connected with said client via a network, said authentication dispatching server including: a first determination device for determining whether an identification data entered from said client is correct; and a user certificate generator for generating a user certificate to said client at a first time while said identification data entered from said client is correct, said user certificate including a predetermined valid period of time; and a plurality of distributed servers connected to said client and said authentication dispatching server via said network for receiving a request from said client at a second time, each of said distributed servers including: a second determination device connected to said client and said authentication dispatching server via said network for double-checking with said authentication dispatching server whether said user certificate of said client is correct and determining whether an interval between said first time and said second time is in said predetermined valid period of time; a processor for executing said request while said second determination device determines said user certificate of said client to be correct and said interval to be in said predetermined valid period of time; and an updated certificate generator for generating an updated certificate to said authentication dispatching server and generating a certificate expiration notice of said user certificate to said client while said interval exceeds said predetermined valid period of time, wherein said updated certificate has a predetermined updated valid period of time.