Broadcast Steganography

Nelly Fazio; Antonio R.  Nicolosi; Irippuge Milinda Perera

Paper 2013/078

Broadcast Steganography

Nelly Fazio, Antonio R. Nicolosi, and Irippuge Milinda Perera

Abstract

We initiate the study of broadcast steganography (BS), an extension of steganography to the multi-recipient setting. BS enables a sender to communicate covertly with a dynamically designated set of receivers, so that the recipients recover the original content, while unauthorized users and outsiders remain \emph{unaware} of the covert communication. One of our main technical contributions is the introduction of a new variant of anonymous broadcast encryption that we term \emph{outsider-anonymous broadcast encryption with pseudorandom ciphertexts} (oABE$). Our oABE$ construction achieves sublinear ciphertext size and is secure in the standard model. Besides being of interest in its own right, oABE$ enables an efficient construction of BS secure in the standard model against adaptive adversaries with sublinear communication complexity.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. MAJOR revision.CT-RSA-2014
DOI: 10.1007/978-3-319-04852-9_4
Keywords: Steganography Broadcast Encryption Receiver Anonymity
Contact author(s): iperera @ gc cuny edu
History: 2014-03-05: last of 4 revisions; 2013-02-20: received; See all versions
Short URL: https://ia.cr/2013/078
License: CC BY

BibTeX

@misc{cryptoeprint:2013/078,
      author = {Nelly Fazio and Antonio R.  Nicolosi and Irippuge Milinda Perera},
      title = {Broadcast Steganography},
      howpublished = {Cryptology ePrint Archive, Paper 2013/078},
      year = {2013},
      doi = {10.1007/978-3-319-04852-9_4},
      note = {\url{https://eprint.iacr.org/2013/078}},
      url = {https://eprint.iacr.org/2013/078}
}