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Paper 2010/084

Attribute-based Authenticated Key Exchange

M. Choudary Gorantla and Colin Boyd and Juan Manuel González Nieto

Abstract

We introduce the concept of attribute-based authenticated key exchange (AB-AKE) within the framework of ciphertext policy attribute-based systems. A notion of AKE-security for AB-AKE is presented based on the security models for group key exchange protocols and also taking into account the security requirements generally considered in the ciphertext policy attribute-based setting. We also extend the paradigm of hybrid encryption to the ciphertext policy attribute-based encryption schemes. A new primitive called encapsulation policy attribute-based key encapsulation mechanism (EP-AB-KEM) is introduced and a notion of chosen ciphertext security is defined for EP-AB-KEMs. We propose an EP-AB-KEM from an existing attribute-based encryption scheme and show that it achieves chosen ciphertext security in the generic group and random oracle models. We present a generic one-round AB-AKE protocol that satisfies our AKE-security notion. The protocol is generically constructed from any EP-AB-KEM that satisfies chosen ciphertext security. Instantiating the generic AB-AKE protocol with our EP-AB-KEM will result in a concrete one-round AB-AKE protocol also secure in the generic group and random oracle models.

Note: A section on hybrid CP-ABE has been added. A few typos have been corrected.

Metadata
Available format(s)
PDF
Publication info
Published elsewhere. To appear at ACISP 2010. This is full version with proofs.
Keywords
Attribute-based Key ExchangeAttribute-based KEMGroup Key Exchange
Contact author(s)
mc gorantla @ gmail com
History
2010-04-24: last of 2 revisions
2010-02-22: received
See all versions
Short URL
https://ia.cr/2010/084
License
Creative Commons Attribution
CC BY
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