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:
Mar. 22, 2016
Filed:
Jul. 09, 2012
Kyung Joo Suh, Seoul, KR;
Sung Ho Choi, Suwon-si, KR;
Beom Sik Bae, Suwon-si, KR;
Young Kyo Baek, Seoul, KR;
Sang Soo Jeong, Suwon-si, KR;
Seung Woo Seo, Seoul, KR;
Young Hoon Park, Seoul, KR;
Dong Hyun Je, Seoul, KR;
Kyung Joo Suh, Seoul, KR;
Sung Ho Choi, Suwon-si, KR;
Beom Sik Bae, Suwon-si, KR;
Young Kyo Baek, Seoul, KR;
Sang Soo Jeong, Suwon-si, KR;
Seung Woo Seo, Seoul, KR;
Young Hoon Park, Seoul, KR;
Dong Hyun Je, Seoul, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
SNU R&DB Foundation, Seoul, KR;
Abstract
The present invention relates to a method and apparatus for updating a key for encrypting multicast data in a wireless communication system. The method of the present invention is characterized by comprising: an information receiving step of receiving information on a group entry time and a group exit time from users who have newly entered an arbitrary group including at least one subgroup; a grouping step of grouping the users using the information on the group entry time and the group exit time; and a key transmission step of either transmitting, to the newly-entered users, keys related to the group and the subgroups, or updating, for the remaining users of the subgroups, both the key related to the subgroup to which the user exiting the group belongs and the key of the group and then transmitting the updated keys to the users of the subgroups.