## CryptoDB

### Paper: Fuzzy Identity Based Encryption

Authors: Amit Sahai Brent Waters URL: http://eprint.iacr.org/2004/086 Search ePrint Search Google 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, $\omega$, to decrypt a ciphertext encrypted with an identity, $\omega'$, if and only if the identities $\omega$ and $\omega'$ 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.
##### BibTeX
@misc{eprint-2004-12059,
title={Fuzzy Identity Based Encryption},
booktitle={IACR Eprint archive},
keywords={public-key cryptography / identity based encryption},
url={http://eprint.iacr.org/2004/086},
note={ bwaters@cs.stanford.edu 12845 received 29 Mar 2004, last revised 3 Mar 2005},
author={Amit Sahai and Brent Waters},
year=2004
}