Title:
ブロードキャスト暗号化のためのユーザキー管理方法
Document Type and Number:
Japanese Patent JP2008520158
Kind Code:
A
Abstract:
A user key management method for a broadcast encryption includes assigning node path identifiers (IDs) to nodes arranged in sequence; assigning random seed value keys to the nodes according to the node path IDs; generating key values by repeatedly applying a hash function to the assigned random seed value keys; and assigning the generated key values to the nodes in sequence. Accordingly, it is possible to reduce the transmission overhead that is most important matter in the broadcast encryption to less than the number of the revoked users. Further, there is an advantage that the transmission overhead of the exemplary embodiments of the present invention is remarkably reduced compared with the Subset Difference method.
Inventors:
De-Yop Kim
Wayon-Il Jin
Fan-Joan Kim
Sun-Joan Park
Jun-Hee Chung
Mun-Fung Kim
Nam-Su Joo
En-Seung Yo
Wayon-Il Jin
Fan-Joan Kim
Sun-Joan Park
Jun-Hee Chung
Mun-Fung Kim
Nam-Su Joo
En-Seung Yo
Application Number:
JP2007541106A
Publication Date:
June 12, 2008
Filing Date:
November 12, 2005
Export Citation:
Assignee:
Samsung Electronics Company Limited
International Classes:
H04L9/08; G06F15/00; H04N21/2347; H04L9/32; H04N21/6334
Domestic Patent References:
| JPH103256A | 1998-01-06 | |||
| JPH11327980A | 1999-11-30 | |||
| JP2001094548A | 2001-04-06 | |||
| JP2003218854A | 2003-07-31 | |||
| JPH11296076A | 1999-10-29 |
Foreign References:
| WO2004025489A1 | 2004-03-25 | |||
| WO2006112635A1 | 2006-10-26 |
Attorney, Agent or Firm:
Masatake Shiga
Takashi Watanabe
Yasuhiko Murayama
Shinya Mitsuhiro
Takashi Watanabe
Yasuhiko Murayama
Shinya Mitsuhiro