SYSTEM AND METHOD FOR COMBINING USER AND PLATFORM AUTHENTICATION IN NEGOTIATED CHANNEL SECURITY PROTOCOLS

• US 20090307493A1
• Filed: 05/19/2009
• Published: 12/10/2009
• Est. Priority Date: 03/24/2004
• Status: Active Grant

• Current Assignee: Tahoe Research Limited (f/k/a Learndale Limited) (Vector Capital Corporation)
• Original Assignee: Intel Corporation
• Inventors: Smith, Ned M.
• Granted Patent: US 8,006,090 B2
• Time in Patent Office: Days
• US Class Current: 713/170
• CPC Class Codes: H04L 63/0823 using certificates cryptographic mechanisms or cryptographic arrangements for entity authentication involving certificates H04L9/3263
• CPC Class Codes: H04L 63/166 at the transport layer

Abstract

A network security handshake exchange for combining user and platform authentication. The security handshake exchange performs operations on a pre-master secret to increase identity verification and security. The pre-master secret is augmented and authenticated with platform identity and user identity credentials of one endpoint. A second phase of exchanges may include exchange of a master secret that is the pre-master secret modified with platform identity and user identity of the other endpoint.

Claims

1. A network security handshake exchange method comprising:

obtaining a pre-master secret that contains a nonce generated by a server endpoint, the pre-master secret including a server stored measurement log (SML) that stores configuration state measured values for the server endpoint;

hashing server platform configuration register values (PCRs) representing a configuration state of the of the server endpoint;

generating at the server endpoint a modified pre-master secret by combining the pre-master secret with the hash of the server PCRs;

incorporating a handshake state into the server endpoint platform configuration values by storing the modified pre-master secret into a PCR of the server endpoint;

generating multi-faceted authentication of the server endpoint by digitally signing the modified pre-master secret with a server platform identity key, and digitally signing the modified pre-master secret with a server user identity key to create a server platform-identity-key signed value and a server user-identity-key signed value; and

sending a first message to a client endpoint, wherein the message includes the pre-master secret, the modified pre-master secret, the server platform-identity-key signed value, and the server user-identity-key signed value.

2. The method of claim 1, wherein combining the pre-master secret with the hash of the server PCRs further comprises:

performing an exclusive OR (XOR) operation on the pre-master secret with the hash of the server PCRs.

3. The method of claim 2, wherein combining the pre-master secret with the hash of the server PCRs further comprises:

hashing the result of the XOR operation.

4. The method of claim 1, wherein the first message further comprises the SML and the hash of the server PCRs.

5. The method of claim 1, further comprising:

receiving an encrypted master secret from the client via a second message, wherein the encrypted master secret is generated by modifying the modified pre-master secret at the client;

verifying the second message; and

generating session keys when the second message is verified.

6. The method of claim 5, wherein the second message includes a client SML and the modified pre-master secret, and wherein verifying the second message comprises:

obtaining a client PCR value from the client SML;

calculating the modified pre-master secret from the master secret and the client PCR value; and

comparing the calculated modified pre-master secret with the stored modified pre-master secret.

7. The method of claim 6, wherein calculating the modified pre-master secret from the master secret and the client PCR value comprises:

performing an XOR operation of the master secret with the client PCR value; and

hashing the result of the XOR operation.

8. An article comprising:

a tangible storage medium having a plurality of machine accessible instructions stored thereon, wherein when the instructions are executed by a processor, the instructions provide for performing operations including

obtaining a pre-master secret that contains a nonce generated by a server endpoint, the pre-master secret including a server stored measurement log (SML) that stores configuration state measured values for the server endpoint;

hashing server platform configuration register values (PCRs) representing a configuration state of the of the server endpoint;

generating at the server endpoint a modified pre-master secret by combining the pre-master secret with the hash of the server PCRs;

incorporating a handshake state into the server endpoint platform configuration values by storing the modified pre-master secret into a PCR of the server endpoint;

generating multi-faceted authentication of the server endpoint by digitally signing the modified pre-master secret with a server platform identity key, and digitally signing the modified pre-master secret with a server user identity key to create a server platform-identity-key signed value and a server user-identity-key signed value; and

sending a first message to a client endpoint, wherein the message includes the pre-master secret, the modified pre-master secret, the server platform-identity-key signed value, and the server user-identity-key signed value.

9. The computer readable storage medium of claim 8, wherein instructions for combining the pre-master secret with the hash of the server PCRs further comprise instructions for

performing an exclusive OR (XOR) operation on the pre-master secret with the hash of the server PCRs.

10. The computer readable storage medium of claim 9, wherein instructions for combining the pre-master secret with the hash of the PCRs further comprise instructions for

hashing the result of the XOR operation.

11. The computer readable storage medium of claim 8, wherein the first message further comprises the SML and the hash of the server PCRs.

12. The computer readable storage medium of claim 9, further comprising instructions for

receiving an encrypted master secret from the client via a second message, wherein the encrypted master secret is generated by modifying the modified pre-master secret at the client;

verifying the second message; and

generating session keys when the second message is verified.

13. The computer readable storage medium of claim 12, wherein the second message includes a client SML and the modified pre-master secret, and wherein the instructions for verifying the second message comprise instructions for

obtaining a client PCR value from the client SML;

calculating the modified pre-master secret from the master secret and the client PCR value; and

comparing the calculated modified pre-master secret with the stored modified pre-master secret.

14. The computer readable storage medium of claim 13, wherein the instructions for calculating the modified pre-master secret from the master secret and the client PCR value comprise instructions for

performing an XOR operation of the master secret with the client PCR value;

and

hashing the result of the XOR operation.

19. The method of claim 12, wherein the first message includes a server SML and the pre-master secret, and wherein verifying the first message comprises:

obtaining a server PCR value from the server SML;

calculating the pre-master secret from the modified pre-master secret and the server PCR value; and

comparing the calculated pre-master secret with the pre-master secret included in the first message.

15. A network security handshake exchange method comprising:

receiving at a client endpoint a first message from a server endpoint, the first message including a server modified pre-master secret, the modified pre-master secret generated by modifying a pre-master secret that contains a nonce generated by the server endpoint with a server platform configuration register value (PCR);

hashing client platform configuration register values (PCRs) representing a configuration state of the of the client endpoint;

generating at the client endpoint a master secret by combining the modified pre-master secret with the hash of the client PCRs;

incorporating a handshake state into the client endpoint platform configuration values by storing the master secret into a PCR of the client endpoint;

generating multi-faceted authentication of the client endpoint by digitally signing the master secret with a client platform identity key, and digitally signing the master secret with a client user identity key to create a client platform-identity-key signed value and a client user-identity-key signed value; and

sending a second message to the server endpoint, wherein the second message includes the modified pre-master secret, the master secret, the client platform-identity-key signed value, and the client user-identity-key signed value.

16. The method of claim 15, wherein combining the modified pre-master secret with the hash of the client PCRs further comprises:

performing an exclusive OR (XOR) operation on the modified pre-master secret with the hash of the client PCRs; and

hashing the result of the XOR operation.

17. The method of claim 15, wherein the second message further comprises the client SML and the hash of the client PCRs.

18. The method of claim 15, further comprising:

verifying the second message; and

generating session keys when the first message is verified.