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Paper 2012/500

Constant Ciphertext Length in CP-ABE

Nishant Doshi and Devesh Jinwala

Abstract

Ciphertext policy attribute based encryption (CP-ABE) is a technique in which user with secret key containing attributes, only able to decrypt the message if the attributes in the policy match with the attributes in secret key. The existing methods that use reasonably computable decryption policies produce the ciphertext of size at least linearly varying with the number of attributes with additional pairing operations during encryption and decryption. In this paper, we propose a scheme in which ciphertext remains constant in length, irrespective of the number of attributes. Our scheme works for a threshold case: the number of attributes in a policy must be a subset of attributes in a secret key. The security of propose scheme is based on Decisional Bilinear Diffie-Hellman (DBDH) problem.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Keywords
AttributeAttribute based encryptionciphertext policyconstant ciphertext length
Contact author(s)
doshinikki2004 @ gmail com
History
2012-09-03: received
Short URL
https://ia.cr/2012/500
License
Creative Commons Attribution
CC BY
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