%0 Conference Paper
%B EUROCRYPT'05 Workshop on the Theory and Application of of Cryptographic Techniques
%D 2005
%T Fuzzy Identity-Based Encryption
%A Amit Sahai
%A Waters, Brent
%K Fuzzy IBE
%K IBE
%X We introduce a new type of Identity-Based Encryption (IBE) scheme that we call Fuzzy Identity-Based Encryption. In Fuzzy IBE we view an identity as set of descriptive attributes. A Fuzzy IBE scheme allows for a private key for an identity, ω, to decrypt a ciphertext encrypted with an identity, ω , if and only if the identities ω and ω are close to each other as measured by the “set overlap” distance metric. A Fuzzy IBE scheme can be applied to enable encryption using biometric inputs as identities; the error-tolerance property of a Fuzzy IBE scheme is precisely what allows for the use of biometric identities, which inherently will have some noise each time they are sampled. Additionally, we show that Fuzzy-IBE can be used for a type of application that we term “attribute-based encryption”. In this paper we present two constructions of Fuzzy IBE schemes. Our constructions can be viewed as an Identity-Based Encryption of a message under several attributes that compose a (fuzzy) identity. Our IBE schemes are both error-tolerant and secure against collusion attacks. Additionally, our basic construction does not use random oracles. We prove the security of our schemes under the Selective-ID security model.
%B EUROCRYPT'05 Workshop on the Theory and Application of of Cryptographic Techniques
%S Lecture Notes in Computer Science
%I Springer
%C Aarhus, Denmark
%V 3494
%8 05/2005