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Paper 2013/078

Broadcast Steganography

Nelly Fazio and 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
SteganographyBroadcast EncryptionReceiver 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
Creative Commons Attribution
CC BY
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