Presentation	2001/7/18 A Practical Public-Key Cryptosystem that is IND-CCA2 under a Single Assumption Mototsugu NISHIOKA,
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Abstract(in English)	The new public-key encryption scheme described in this paper is based on the Cramer-Shoup scheme[5]but can be proven to be semantically secure against an adaptive chosen ciphertext attack (IND-CCA2) under a weaker assumption than that of the Cramer-Shoup scheme. It requires no functional assumptions and requires only one number theoretic assumption to assure the ideal security.This number theoretic assumoption is weaker than the Decisional Diffie-Hellman (DDH) assumption underlying the Carmer-Shoup scheme.The new scheme is also more practical than the previous public-key cryptosystems that are IND-CCA2 under a single assumption.
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Keyword(in English)	Public-key cryptosytstem / Provably secure / Adaptive chosen-ciphertext attack / Semantic security / Standard model
Paper #	ISEC2001-23
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Conference Information
Committee	ISEC
Conference Date	2001/7/18(1days)
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Paper Information
Registration To	Information Security (ISEC)
Language	ENG
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	A Practical Public-Key Cryptosystem that is IND-CCA2 under a Single Assumption
Sub Title (in English)
Keyword(1)	Public-key cryptosytstem
Keyword(2)	Provably secure
Keyword(3)	Adaptive chosen-ciphertext attack
Keyword(4)	Semantic security
Keyword(5)	Standard model
1st Author's Name	Mototsugu NISHIOKA
1st Author's Affiliation	Systems Development Laboratory, Hitachi, Ltd.()
Date	2001/7/18
Paper #	ISEC2001-23
Volume (vol)	vol.101
Number (no)	214
Page	pp.pp.-
#Pages	8
Date of Issue