Multi-access virtual private network

CAFC
  • US 6,158,011 A
  • Filed: 02/26/1999
  • Issued: 12/05/2000
  • Est. Priority Date: 08/26/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for carrying out communications over a multi-tier virtual private network, said network including a server and a plurality of client computers, the server and client computers each including means for transmitting data to and receiving data from an open network, wherein said means for transmitting data to and receiving data from an open network includes a lower set of communications drivers, said lower set of communications drivers being arranged to receive function calls and requests for service from an applications program in order to transmit and receive said data comprising:

  • means for intercepting said function calls and requests for service sent by said applications program to said lower level set of communications drivers, said intercepted function calls and requests for service being limited to communications functions with no reference to encryption functions;

    means for causing an applications level authentication and encryption program in said one of said client computers to communicate with the server in response to receiving said intercepted function calls and requests for service by generating a session key, using the session key generated by the applications level authentication and encryption program to encrypt file sent by the applications program, and sending function calls and requests for service to the lower level set of communications drivers in order to transmit said encrypted files over said open network.

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