Distributed Steganography

In this paper, we address the issue of "distributed steganography" known as many cooperative computations with distributed parties in the covert communication. We present a model of distributed steganography, and give some properties. For the reader\´s convenience, we consider a scenario in which two senders have their own private data, and wish to carry out a steganographic technique on the union of their private inputs, without revealing any information. The recipient only acquire the union of their inputs. Moreover, they wish to avoid adversaries\´ attention to the covert communication. We propose a practical scheme to achieve two-party distributed steganography, combining with two different mechanisms: wet paper coding and secure multi-party computation. Detailed correctness, security analysis, and generalization of the scheme are also provided.