Cryptanalysis of Searchable Anonymous Attribute Based Encryption

Payal Chaudhari; Manik Lal Das

Paper 2016/347

Cryptanalysis of Searchable Anonymous Attribute Based Encryption

Payal Chaudhari and Manik Lal Das

Abstract

Ciphertext Policy Attribute Based Encryption (CP - ABE) is a public key primitive in which a user is only able to decrypt a ciphertext if the attributes associated with secret key and the access policy connected with ciphertext matches. CP-ABE provides both confidentiality and access control to the data stored in public cloud. Anonymous CP-ABE is an adaptation of ABE where in addition to data confidentiality and access control, receiver anonymity is also provided. Recently, Koo et al. (2013) proposed a scheme in the area of anonymous CP-ABE. We found security flaws in Koo et al.’s scheme. Their scheme does not support anonymity of the intended receiver, which was the main security claim in [8]. In this paper, we show how one can identify the receiver in Koo et al.’s scheme.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint. MINOR revision.
Keywords: Attribute Based Encryption Anonymity Bilinear Pairing Access Structure
Contact author(s): payal ldrp @ gmail com
History: 2016-04-01: received
Short URL: https://ia.cr/2016/347
License: CC BY

BibTeX

@misc{cryptoeprint:2016/347,
      author = {Payal Chaudhari and Manik Lal Das},
      title = {Cryptanalysis of Searchable Anonymous Attribute Based Encryption},
      howpublished = {Cryptology {ePrint} Archive, Paper 2016/347},
      year = {2016},
      url = {https://eprint.iacr.org/2016/347}
}