Secret Writing on Dirty Paper: A Deterministic View
  Recently there has been a lot of success in using the deterministic approach to provide approximate characterization of Gaussian network capacity. In this paper, we take a deterministic view and revisit the problem of wiretap channel with side information. A precise characterization of the secrecy capacity is obtained for a linear deterministic model, which naturally suggests a coding scheme which we show to achieve the secrecy capacity of the degraded Gaussian model (dubbed as "secret writing on dirty paper") to within half a bit. 
Mustafa El-Halabi, Tie Liu, Costas Georghiades, and Shlomo Shamai   (Shitz)
cs.IT math.IT