The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 2006
Filed:
Jun. 27, 2001
Shigang Chen, Santa Clara, CA (US);
Liman Wei, Santa Clara, CA (US);
Shigang Chen, Santa Clara, CA (US);
Liman Wei, Santa Clara, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A method and apparatus for negotiating a shared secret among members of a multicast group are disclosed. A tree that represents the group is created and stored in a memory. Each node of the tree is associated with a group member. The shared secret is generated by traversing the tree in post-order, and at each node of the tree, recursively generating a partial key value for use in the shared secret and a base value for use in subsequent recursive partial key value generation. At each node, a partial key value is computed by accumulating the exponent portion of the Diffie-Hellman key equation and computing a new base value for use in subsequent computations. If a particular node has a left or right child sub-tree, each sub-tree is also recursively traversed in post-order fashion. When traversal of the entire tree is complete, all nodes have the shared secret key.