高效的选择密文安全的单向代理重加密方案

doi:10.3969/j.issn.1000-436x.2013.07.010

Abstract

Abstract:

In order to construct an efficient and chosen-chiphertext secure unidirectional re-encryption scheme in the standard model,a novel and efficient unidirectional proxy re-encryption scheme was proposed, and its chosen-ciphertext security in the adaptive corruption model was proved in the standard model. Compared with LV scheme, this scheme has the advantages of both higher efficiency and stronger curity. Under the same security level, this scheme has lower computational cost than that of WJ scheme.

Key words: proxy re-encryption, chosen-ciphertext security, adaptive corruption model, standard model

Wei-wei ZHANG,Ru ZHANG,Jian-yi LIU,Xin-xin NIU,Yi-xian YANG. Efficient chosen-ciphertext secure proxy re-encryption scheme[J]. Journal on Communications, 2013, 34(7): 87-97.

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References 22

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	方案指标	WJ方案	LV方案	本文方案
密文长度	第1层第2层	\|Zp\|+2\|G₁\|+\|G₂\|+l\|Zp\|+3\|G₁\|+l	\|svk \|+4\|G₁\|+\|G₂\|+\|s \|\|svk \|+2\|G₁\|+\|G₂\|+\|s \|	\|svk\|+3\|G₁\|+2\|G₂\|+\|s \|\|svk \|+4\|G₁\|+\|G₂\|+\|s \|
	Enc1	6t_e	6te+ts	6te+ts
	Enc2	6t_e	4te+ts	6te+ts
运算代价	ReEncDec1	3tp+6te2tp+2te	2tp+4te+tv5tp+2te+tv	3tp+te+tv2te+tv
	Dec2	3tp+7te	3tp+2te+tv	3tp+2te+tv
	总运算代价	8tp+27te	10tp+18te+2ts+3tv	6tp+17te+2ts+3tv
	PRE类型	单向单跳	单向单跳	单向单跳
	随机预言机	无需	无需	无需
	困难假设	3-wDBDHI	3-wDBDHI	3-wDBDHI
	安全性	CCA	RCCA	CCA
	攻陷模型	自适应	非自适应	自适应

Efficient chosen-ciphertext secure proxy re-encryption scheme

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