Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles

Johannes Blömer; Gennadij Liske

Paper 2013/646

Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles

Johannes Blömer and Gennadij Liske

Abstract

We present a new technique to realize attribute-based encryption (ABE) schemes secure in the standard model against chosen-ciphertext attacks (CCA-secure). Our approach is to extend certain concrete chosen-plaintext secure (CPA-secure) ABE schemes to achieve more efficient constructions than the known generic constructions of CCA-secure ABE schemes. We restrict ourselves to the construction of attribute-based key encapsulation mechanisms (KEMs) and present two concrete CCA-secure schemes: a key-policy attribute-based KEM that is based on Goyal's key-policy ABE and a ciphertext-policy attribute-based KEM that is based on Waters' ciphertext-policy ABE. To achieve our goals, we use an appropriate hash function and need to extend the public parameters and the ciphertexts of the underlying CPA-secure encryption schemes only by a single group element. Moreover, we use the same hardness assumptions as the underlying CPA-secure encryption schemes.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint. MINOR revision.
Keywords: attribute-based key encapsulation mechanism attribute-based encryption chosen-ciphertext security bilinear maps
Contact author(s): gennadij liske @ upb de
History: 2013-10-10: received
Short URL: https://ia.cr/2013/646
License: CC BY

BibTeX

@misc{cryptoeprint:2013/646,
      author = {Johannes Blömer and Gennadij Liske},
      title = {Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles},
      howpublished = {Cryptology {ePrint} Archive, Paper 2013/646},
      year = {2013},
      url = {https://eprint.iacr.org/2013/646}
}