Abstract: The random mask of virtual optical encryption system is a 2-D matrix, it occupies too much memory space. In allusion to the fact that spatiotemporal chaotic system produces a large number of uncorrelated pseudo-random sequences and is very sensitive to the chaotic initial value and control parameters, a novel encryption scheme combines spatiotemporal chaotic system with virtual optical lens imaging encryption technique. In this scheme, some spatiotemporal chaotic sequences are generated to encrypt important information safely. Three parameters of spatiotemporal chaotic system take the place of random mask and reduce memory space. The simulation results reveal that the key of this encryption scheme has high precision and this encryption scheme can resist brute force attack in certain key space.

Key words: virtual optical, lens imaging, encryption system；spatiotemporal chaos

摘要： 目前虚拟光学加密中的随机模板密钥是二维矩阵，占据的内存大。根据时空混沌系统对混沌驱动初值及控制参数高度敏感，并能产生大量非相关的伪随机序列的特性，将该系统与虚拟光学加密系统相结合，利用混沌系统产生拟平均分布的时空混沌序列，以干扰待加密信息，实现安全加密。随机模板密钥由时空混沌的三个参数代替，减少了内存占用。经Matlab仿真实验证明，该方案密钥灵敏度高，在一定的密钥长度下可以抵抗暴力破解。

关键词: 虚拟光学, 透镜成像, 加密系统, 时空混沌