\begin{thebibliography}{1}

\bibitem{Hwang2011bk}
M.~S. Hwang and I.~C. Lin, {\em Introduction to Information and Network
  Security (4ed, in Chinese)}.
\newblock Taiwan: Mc Graw Hill, 2011.

\bibitem{wha1998km}
D.~M. Wallner, E.~Harder, and R.~C. Agee.
\newblock ``Key management for multicast: Issues and architectures,''.
\newblock Tech. Rep. RFC 2627, Sep. 1998.

\bibitem{Wu2008mc}
C.~C. Wu, S.~J. Kao, W.~C. Kuo, and M.~S. Hwang, ``A robust-fragilewatermarking
  scheme for image authentication,'' in {\em Proceedings of The Third
  International Conference on Innovative Computing, Information and Control
  (ICICIC 2008)}, pp.~176--180, Dalian, China, June 2008.

\end{thebibliography}
