New security notions for identity based encryption
نویسنده
چکیده
7
منابع مشابه
Security Notions for Identity Based Encryption
Abstract. Identity Based Encryption (IBE) has attracted a lot of attention since the publication of the scheme by Boneh and Franklin. So far, only indistinguishability based security notions have been considered in the literature, and it has not been investigated whether these definitions are appropriate. For this purpose, we define the goals of semantic security and non-malleability for IBE. W...
متن کاملRelations Among Notions of Security for Identity Based Encryption Schemes
This paper shows that the standard security notion for identity based encryption schemes (IBE), that is IND-ID-CCA2, captures the essence of security for all IBE schemes. To achieve this intention, we first describe formal definitions of the notions of security for IBE , and then present the relations among OW, IND, SS and NM in IBE , along with rigorous proofs. With the aim of comprehensivenes...
متن کاملA Separation Between Selective and Full-Identity Security Notions for Identity-Based Encryption
Identity-based encryption has attracted a lot of attention since the publication of the scheme by Boneh and Franklin. In this work we compare the two adversarial models previously considered in the literature, namely the full and selective-identity models. Remarkably, we show that the strongest security level with respect to selective-identity attacks (i.e. chosen-ciphertext security) fails to ...
متن کاملGeneralized Key Delegation for Hierarchical Identity-Based Encryption
In this paper, we introduce a new primitive called identity-based encryption with wildcard key derivation (WKD-IBE, or “wicked IBE”) that enhances the concept of hierarchical identity-based encryption (HIBE) by allowing more general key delegation patterns. A secret key is derived for a vector of identity strings, where entries can be left blank using a wildcard. This key can then be used to de...
متن کاملFormal Security Treatments for IBE-to-Signature Transformation: Relations among Security Notions
In a seminal paper of identity based encryption (IBE), Boneh and Franklin [BF01] mentioned an interesting transform from an IBE scheme to a signature scheme, which was observed by Moni Naor. In this paper, we give formal security treatments for this transform and discover several implications and separations among security notions of IBE and transformed signature. For example, we show for such ...
متن کامل