关键词: 混沌, 图像加密, 一维线性映射, 混沌退化

Abstract: Chaos is widely used in image encryption because of its high sensitivity to initial conditions and parameters and its stochastic series. A kind of chaos map whose parameters were randomly changed was brought forward. A chaos key stream with good randomcity and long cycle was made out, whose statistic character was proved strictly. The key stream has been used to encrypt image, and method was proved to work well.

Key words: chaos, image encryption, piecewise linear chaos map, chaos degradation