摘要：This paper presents a novel algorithm for a color image encryption which involves simultaneously two operations in one: permutation and substitution of pixels. It uses the rows and columns of images' bits as transformation units. Each bit is regarded as an observed entity having a light ray which intersects a new rotated image. The intersection position is used to paste the corresponding bit. Such projection makes the pixels' bits migrate between each other which generate a cipher image. Despite its simplicity, the algorithm shows a great resistance against many kinds of attacks through its sensitivity to the initial values used in encryption
关键词：image encryptio n; bit permutation; pixel substitution; projection; security
