Presentation	2003/9/12 On Security of Hwang-Kim-Lee Broadcast Encryption Scheme Tomoyuki ASANO,
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Abstract(in English)	A broadcast encryption scheme or revocation scheme allows a sender to send information securely to a group of receivers excluding some recievers over a broadcast channel. Recently, a new method for a broadcast encryption scheme was proposed by Hwang, Kim and Lee. Their method is very efficient with respect to the communication overhead and the storage overhead at receivers. However, their method is insecure against a collusion of receivers. In this paper we show an attack in which a collusion of two receivers can obtain other receivers' keys which are not given to any of the colluding receivers.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	broadcast encryption / revocation / stateless receiver / subset difference / key management
Paper #	ISEC2003-53
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Conference Information
Committee	ISEC
Conference Date	2003/9/12(1days)
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Paper Information
Registration To	Information Security (ISEC)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	On Security of Hwang-Kim-Lee Broadcast Encryption Scheme
Sub Title (in English)
Keyword(1)	broadcast encryption
Keyword(2)	revocation
Keyword(3)	stateless receiver
Keyword(4)	subset difference
Keyword(5)	key management
1st Author's Name	Tomoyuki ASANO
1st Author's Affiliation	Sony Corporation()
Date	2003/9/12
Paper #	ISEC2003-53
Volume (vol)	vol.103
Number (no)	315
Page	pp.pp.-
#Pages	5
Date of Issue