说明：  介绍了数字图像加密技术的现状，主要介绍了混沌在数字图像加密领域内的应用。 提供了一个基于双混沌的数字图像加密算法
(Introduced a digital image encryption technology, the status quo, mainly introduced the chaos in the field of digital image encryption applications. Provides a dual-chaos-based digital image encryption algorithm)