结合矢量分解和相位剪切提出一种新的非对称光学图像加密算法，明文经过4个密钥加密得到分布均匀的密文和3个解密密钥。解密密钥在加密过程中产生，不同于加密密钥,实现了非对称加密,增加了系统的安全性。在矢量分解过程中产生的解密密钥与明文关联强，比现有光学非对称加密算法中明文对密文和解密密钥更为敏感，抵御选择明文攻击能力更强，同时也提高了解密密钥的敏感性。相位剪切的引入扩大了密钥空间,增强算法安全性，产生实数密文更便于传输。实验分析表明：该算法密文分布均匀、相邻像素相关性低，解密密钥、明文对解密密钥和密文敏感性高，抵御各种攻击能力强，有更好光学图像加密效果。

A new asymmetric optical image encryption algorithm was proposed, which combined vector decomposition and phase-truncated. The plaintext was encrypted by four keys to obtain uniformly distributed ciphertext and three decryption keys. The decryption key was generated in the encryption process, which was different from the encryption key. It realized asymmetric encryption and increased the security of the system. The decryption key generated in the process of vector decomposition was strongly related to plaintext. Compared with the existing optical asymmetric encryption algorithms, plaintext was more sensitive to ciphertext and decryption keys. The system was more resistant to selective plaintext attack. At the same time, it also improved the sensitivity of decryption keys. The introduction of phase-truncated enlarged the key space and enhanced the security of the algorithm. Moreover real number ciphertext was produced for easier transmission. The experimental results show that the algorithm has uniform ciphertext distribution and low correlation between adjacent pixels. The decrypted keys and the plaintext to decrypted keys and ciphertext are highly sensitive. This algorithm has strong ability to resist various attack and better optical image encryption effect.