Presentation	1995/11/16 Protecting Privacy in Key Escrow Systems Yoshinori YAMANE, Kouichi SAKURAI,
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Abstract(in Japanese)	(See Japanese page)
Abstract(in English)	Methods of restricting court-authorized eavesdropping in key escrow systems are investigated. A simple way is to use time-bounded keys, however, this is very inefficient because it requires many keys for long time communications. An introduced way is to apply a blind decoding protocol: A client has an encrypted message with a server's secret key and the client asks the server to decode the message without revealing what is the decoded plaintext nor learning the server's secret key. A blind decoding protocol for ElGamal public-key cryptosystems is newly developed, and modified key escrow systems are presented.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	Key Escrow Systems / ElGamal Encryption / Blind Decoding / Privacy Protection / On-line Shopping System
Paper #	ISEC95-28
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Conference Information
Committee	ISEC
Conference Date	1995/11/16(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)	Protecting Privacy in Key Escrow Systems
Sub Title (in English)
Keyword(1)	Key Escrow Systems
Keyword(2)	ElGamal Encryption
Keyword(3)	Blind Decoding
Keyword(4)	Privacy Protection
Keyword(5)	On-line Shopping System
1st Author's Name	Yoshinori YAMANE
1st Author's Affiliation	Department of Computer Science and Communication Engineering Kyushu University()
2nd Author's Name	Kouichi SAKURAI
2nd Author's Affiliation	Department of Computer Science and Communication Engineering Kyushu University
Date	1995/11/16
Paper #	ISEC95-28
Volume (vol)	vol.95
Number (no)	353
Page	pp.pp.-
#Pages	11
Date of Issue