On multi-authority ciphertext-policy attribute-based encryption

Sascha M\; Stefan Katzenbeisser; Claudia Eckert

doi:10.4134/BKMS.2009.46.4.803

Bulletin of the
Korean Mathematical Society BKMS

ISSN(Print) 1015-8634 ISSN(Online) 2234-3016

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Bull. Korean Math. Soc. 2009; 46(4): 803-819

Printed July 1, 2009

https://doi.org/10.4134/BKMS.2009.46.4.803

On multi-authority ciphertext-policy attribute-based encryption

Sascha M\"uller, Stefan Katzenbeisser, and Claudia Eckert

Technische Universit\"at Darmstadt

Abstract

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Abstract

In classical encryption schemes, data is encrypted under a single key that is associated with a user or group. In Ciphertext-Policy Attribute-Based Encryption(CP-ABE) keys are associated with attributes of users, given to them by a central trusted authority, and data is encrypted under a logical formula over these attributes. We extend this idea to the case where an arbitrary number of independent parties can be present to maintain attributes and their corresponding secret keys. We present a scheme for multi-authority CP-ABE, propose the first two constructions that fully implement the scheme, and prove their security against chosen plaintext attacks.

Keywords: attribute-based encryption, bilinear groups

MSC numbers: 94A60