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:
Oct. 16, 2012
Filed:
Apr. 16, 2010
Zhenfu Cao, Shanghai, CN;
Huang Lin, Shanghai, CN;
Xiaolei Dong, Shanghai, CN;
Xiaohui Liang, Shanghai, CN;
Dongsheng Xing, Shanghai, CN;
Zhenfu Cao, Shanghai, CN;
Huang Lin, Shanghai, CN;
Xiaolei Dong, Shanghai, CN;
Xiaohui Liang, Shanghai, CN;
Dongsheng Xing, Shanghai, CN;
Sony Corporation, Tokyo, JP;
Abstract
Methods and apparatuses for key generation, encryption and decryption in broadcast encryption. A public parameter and a primary key based on a first random number are generated. For each of leaf nodes in a binary tree, a right key set of the leaf node is calculated, the right key set including a right key of the leaf node and right keys of right brother nodes for all the nodes on a path from a root node to the leaf node. A left key set of the leaf node is calculated, the left key set including a left key of the leaf node and left keys of left brother nodes for all the nodes on the path. The sum of the second and third random numbers equals to the first random number. The second random number is different for different subscribers.