未知信道中的信息隐藏容量

随着计算机技术和网络的不断发展，人们对于版权保护和身份认证的需求不断增长，信息隐藏技术的重要性日渐显现。如果把信息隐藏看作通信过程，由于信道错误和恶意攻击的存在，信息的发送方和接收方通常均无法完全了解这一通信信道的所有特性，这为估计信息隐藏的容量带来了不少困难，从而影响了信息隐藏技术的进一步发展。该文针对信道错误和恶意攻击提出了一种估算信息隐藏容量的数学模型，该模型可以较好地抵抗一般的攻击和信道错误对信息传输造成的影响，从而为信息隐藏提供了理论依据。该文分析了信息隐藏容量的上下界，仿真结果表明这一方法具有较好的实用性。

Information Hiding Capacity in Unknown Channel

With the development of computer technology and network, the need for copyright protection and authentication is increasing day by day, and the information hiding technique is becoming more and more importunt, if we consider information hiding as communication process, neither the information sender nor the receiver is able to know all the characteristics of this communication channel due to the existence of channel error and malicious attacks. This has made the assumption of information hiding capacity more difficult and has delayed the development of information hiding. In the paper, a mathematical model for the calculation of information hiding capacity is prooposed in the presence of channel error and malicious attacks. This model can avoid the effect of general attacks and errors soundly and provide a theoretic basis for information hiding. The lower and upper bound of the information hiding capacity are analyzed, and simulation results have proved this method is quite practical.