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:
Nov. 25, 2014
Filed:
Apr. 30, 2012
Weon-il Jin, Suwon-si, KR;
Dae-youb Kim, Seoul, KR;
Hwan-joon Kim, Seoul, KR;
Sung-joon Park, Seoul, KR;
Weon-il Jin, Suwon-si, KR;
Dae-youb Kim, Seoul, KR;
Hwan-joon Kim, Seoul, KR;
Sung-joon Park, Seoul, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
Abstract
A combination-based broadcast encryption method includes: assigning by a server a base group of different combinations to each user; producing and sending secret information for each user by using as a base the base group allocated to each user; producing and sending an inverse-base parameter value through calculations with integers used to produce the base group and key value information of one or more privileged users; and deriving a group key by using the key value information of the privileged users, encrypting a session key by using the derived group key, and sending the encrypted session key to each user. Accordingly, each user is assigned a different base through a combination, thereby having security against collusion attacks.