Computer network security system and method having unilateral enforceable security policy provision

• US 7,174,563 B1
• Filed: 11/01/2000
• Issued: 02/06/2007
• Est. Priority Date: 12/08/1997
• Status: Expired due to Fees

• Current Assignee: Entrust Incorporated (Entrust Corp.)
• Original Assignee: Entrust Incorporated (Entrust Corp.)
• Inventors: Brownlie, Michael, Hillier, Stephen, Van Oorschot, Paul C.
• Primary Examiner(s): Vu, Kim
• Assistant Examiner(s): Dada, Beemnet W.
• Application Number:
  US09/707,285
• Time in Patent Office: 2,288 Days
• Field of Search: 713/200, 713/201, 713/168, 713156-158, 713/175, 713/176, 713/151, 713/152, 713/1, 709/200, 709/229, 709/237, 709/223, 709/225, 707/9, 707/10, 706/46, 706/47, 726/1, 726/10
• US Class Current: 726/1
• CPC Class Codes: G06F 21/33 using certificates
• CPC Class Codes: H04L 63/126 the source of the received data
• CPC Class Codes: H04L 63/20 for managing network security; network security policies in general filtering policies H04L63/0227

Abstract

A computer network security system and method utilizes digitally signed and centrally assigned policy data, such as password length rules, that is unilaterally enforced at network nodes by node policy enforcement engines. The policy data may be variable on a per client or network node basis through a centralized authority, such as a certification authority. The computer network security system provides variable security policy rule data for distribution to at least one network node through a central security policy rule data distribution source, such as the certification authority. The central security policy rule data distribution source associates a digital signature to the variable security policy rule data to ensure the integrity of the policies in the system. Each network node uses a policy rule data engine and policy rule table to decode policy rule data and enforce the policy rules as selectively determined through the central authority.

Claims

1. A computer network security system having enforceable security policy provision comprising:

means for providing variable security policy rule data for distribution to at least one network node;

means, operatively coupled to the means for providing, for associating a digital signature of a central security policy rule data distribution source to the variable security policy rule data;

means for storing the digital signature and the variable policy rule data; and

network node means;

operatively coupled to the storage means, for periodically obtaining the digital signature and the variable policy rule data from the means for storing, and not from a forwarded signed message, and for analyzing the variable policy rule data to facilitate unilateral security policy enforcement at a network node level.

2. The computer network system of claim 1 wherein the means for providing includes user interface means for facilitating selection of variable security policy rule data.

3. The computer network system of claim 1 wherein the means for providing provides the variable security policy rule data from a data file.

4. The computer network system of claim 1 wherein the means for providing variable security policy rule data facilitates selection of variable security policy rule data on a per network node basis for central policy definition for the at least one network node.

5. The computer network system of claim 1 wherein the means for associating a digital signature of a central security policy rule data distribution source includes means for associating a digital signature to the variable policy rule data to create a policy certificate.

6. The computer network system of claim 1 wherein the network node means includes:

means for storing variable policy rule data; and

means, operatively coupled to the means for storing, for using policy rule analysis data to decode the variable policy rule data to facilitate security policy enforcement at a network node level.

7. The computer network system of claim 1 wherein the variable policy rule data includes at least security policy identification data and policy rule setting data.

8. The computer network system of claim 7 wherein the variable policy rule data includes policy rule prioritization data.

9. The computer network system of claim 1 wherein the variable policy rule data includes policy rule data on a per application basis for a plurality of software applications supported by at least one network node.

10. The computer network system of claim 1 wherein the means for storing the digital signature and the variable policy rule data stores a policy certificate for distribution to the network node under control of the network node.

11. The computer network system of claim 1 wherein the means for storing the digital signature and the variable policy rule data stores a policy certificate for distribution to the network nodes under control of the means for associating.

21. The system of claim 1 wherein the central security policy rule data distribution source is a certification authority.

22. The system of claim 1 wherein the variable policy rule data includes policy rule data on a per node basis.

12. A method for providing enforceable security policy provisions comprising:

providing variable security policy rule data for distribution to at least one network node;

associating a digital signature of a central security policy rule data distribution source to the variable security policy rule data;

storing the digital signature and the variable policy rule data; and

periodically obtaining the digital signature and the variable policy rule data, not forwarded with a signed message, and analyzing the variable policy rule data to facilitate unilateral security policy enforcement.

13. The method of claim 12, wherein the step of providing variable security policy rule data includes facilitating selection of variable security policy rule data.

14. The method of claim 12, wherein providing variable security policy rule data includes facilitating selection of variable security policy rule data on a per network node basis for policy definition for at least one network node.

15. The method of claim 12, wherein associating a digital signature of a central security policy rule distribution source includes associating a digital signature to the variable policy rule data to create a policy certificate.

16. The method of claim 12, wherein the step of obtaining the digital signature and the variable policy rule data includes:

storing variable policy rule data;

storing policy rule analysis data for evaluating the policy rule data; and

using the policy rule analysis data to decode the variable policy rule data to facilitate unilateral security policy enforcement at a network node level.

17. The method of claim 12, wherein the variable policy rule data includes at least security policy identification data, policy rule setting data and policy rule prioritization data.

18. The method of claim 12 wherein the variable policy rule data includes differing policy rule data for a plurality of software applications supported by at least one network node and wherein the at least one network node includes means for facilitating cryptographic processing of data that is accessible by the plurality of software applications.

19. The method of claim 12, wherein storing the digital signature and the variable policy rule data includes storing a policy certificate for distribution to the network nodes under control of the network nodes.

20. The method of claim 12, wherein storing the digital signature and the variable policy rule data includes storing a policy certificate for distribution to the network nodes under control of a network server.

23. A computer having enforceable security policy provision comprising:

means for securely obtaining variable policy rule data from a central security policy rule data distribution source and not from a forwarded signed message;

means, operatively coupled to the means for obtaining, for analyzing the variable policy rule data;

means, responsive to the means for analyzing the variable policy rule data, for facilitating unilateral security policy enforcement at a network node level based on the variable policy rule data; and

wherein the variable policy rule data includes differing policy rule data for a plurality of software applications supported by the computer and wherein the computer includes means for facilitating cryptographic processing of data that is accessible by the plurality of software applications.

24. A computer having enforceable security policy provision comprising:

means for securely obtaining variable policy rule data from a central security policy rule data distribution source and not from a forwarded signed message;

means, operatively coupled to the means for obtaining, for analyzing the variable policy rule data;

means responsive to the means for analyzing the variable policy rule data, for facilitating unilateral security policy enforcement at a network node level based on the variable policy rule data; and

wherein the variable policy rule data includes policy rule prioritization data and wherein the means for periodically obtaining obtains a digital signature corresponding to the policy rule data.

25. A storage medium for storing programming instructions that, when read by a processing unit, causes the processing unit to provide enforceable security policy provision, the storage medium comprising:

first means for storing programming instructions that facilitate storing variable security policy rule data for use by a network node;

second means for storing programming instructions that facilitate providing the variable security policy rule data for distribution to at least one network node other than through a forwarded signed message to facilitate unilateral security policy enforcement at a network node level; and

wherein the first means for storing programming instructions stores programming instructions that, when read by a processing unit, causes the processing unit to associate a digital signature to a policy rule data to create a policy certificate.