Presentation	2005-11-15 A Universally Composable Commitment Protocol based on KEA1 and Revocable DDH Assumptions Yosuke IWASAKI, Seigo ARITA,
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Abstract(in English)	This paper shows a universally composable commitment protocol which under the KEA1 and Revocable DDH assumptions securely realizes the ideal functionality F_ of a single commitment. We use an extractor in KEA1 assumption in order to realize extractability of the protocol. By the protocol wa can commit to k-bit message with O(k) bits in O(k^3) computations. It is as efficient as the currently most efficient UC protocol of [1] based on Okamoto-Uchiyama encryption scheme.
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Keyword(in English)	Commitment protocol / Universal Composability / Extractability / Equivocability / KEA1 / Revocable DDH
Paper #	ISEC2005-107,OIS2005-70
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Committee	ISEC
Conference Date	2005/11/8(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)	A Universally Composable Commitment Protocol based on KEA1 and Revocable DDH Assumptions
Sub Title (in English)
Keyword(1)	Commitment protocol
Keyword(2)	Universal Composability
Keyword(3)	Extractability
Keyword(4)	Equivocability
Keyword(5)	KEA1
Keyword(6)	Revocable DDH
1st Author's Name	Yosuke IWASAKI
1st Author's Affiliation	()
2nd Author's Name	Seigo ARITA
2nd Author's Affiliation
Date	2005-11-15
Paper #	ISEC2005-107,OIS2005-70
Volume (vol)	vol.105
Number (no)	396
Page	pp.pp.-
#Pages	6
Date of Issue