文章基本信息

标题：Relations among Notions of Security for Identity Based Encryption Schemes
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作者：Peng Yang ; Goichiro Hanaoka ; Yang Cui 等
期刊名称：IPSJ Digital Courier
电子版ISSN：1349-7456
出版年度：2006
卷号：2
页码：465-477
DOI：10.2197/ipsjdc.2.465
出版社：Information Processing Society of Japan
摘要：Identity based encryption ( ΙΒε ) schemes have been flourishing since the very beginning of this century. In ΙΒε , proving the security of a scheme in the sense of IND-ID-CCA2is widely believed to be sufficient to claim that the scheme is also secure in the senses of both SS-ID-CCA2 and NM-ID-CCA2. The justification for this belief is the relations among indistinguishability (IND), semantic security (SS) and non-malleability (NM). However these relations have been proved only for conventional public key encryption ( ΡΚε ) schemes in previous works. The fact is that ΙΒε and ΡΚε have a difference of special importance, i.e., only in ΙΒε can the adversaries perform a particular attack, namely, the chosen identity attack . In this paper we have shown that security proved in the sense of IND-ID-CCA2 is validly sufficient for implying security in any other sense in ΙΒε . This is to say that the security notion, IND-ID-CCA2, captures the essence of security for all ΙΒε schemes. To show this, we first formally defined the notions of security for ΙΒε , and then determined the relations among IND, SS and NM in ΙΒε , along with rigorous proofs. All of these results take the chosen identity attack into consideration.