| US 7,591,012 B2 | ||
| Dynamic negotiation of encryption protocols | ||
| Karthik Jaganathan, Redmond, Wash. (US); and Liqiang Zhu, Kirkland, Wash. (US) | ||
| Assigned to Microsoft Corporation, Redmond, Wash. (US) | ||
| Filed on Mar. 02, 2004, as Appl. No. 10/791,035. | ||
| Prior Publication US 2005/0198490 A1, Sep. 08, 2005 | ||
| Int. Cl. H04L 9/18 (2006.01); H04L 29/00 (2006.01) | ||
| U.S. Cl. 726—14 [380/278] | 23 Claims |
| 1. A method employed on a server computer for switching from a first encryption algorithm to a second encryption algorithm,
comprising:
receiving an encryption algorithm negotiation request from a client computer, wherein the encryption algorithm negotiation
request specifies an encryption algorithm for subsequent communications between the client computer and the server computer;
sending a subsession key to the client computer, wherein the subsession key may be used by the client computer to switch from
an established first encryption to a second encryption algorithm for use in conjunction with the selected encryption algorithm
to encrypt future communications to the server computer; and
determining the encryption algorithm for future communications between the first computer and the second computer by deriving
an encryption algorithm from a key sent with said encryption algorithm negotiation request.
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