N. Fazio,
A. Nicolosi,
and M. 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 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 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.
Publication Info:
In RSA Conference Cryptographers' Track (CT-RSA '14). San Francisco, USA, February 24-28, 2014.
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