We consider a public multi-user information embedding (watermarking) system in which two messages (watermarks) are independently embedded into two correlated covertexts and are transmitted through a multiple-access attack channel. The tradeoff between the achievable embedding rates and the average distortions for the two embedders is studied. For given distortion levels, inner and outer bounds for the embedding capacity region are obtained in single-letter form. Tighter bounds are also given for independent covertexts.
@article{arxiv.1003.1655,
title = {Inner and Outer Bounds for the Public Information Embedding Capacity Region Under Multiple Access Attacks},
author = {Yangfan Zhong and Yadong Wang and Fady Alajaji and Tamas Linder},
journal= {arXiv preprint arXiv:1003.1655},
year = {2010}
}