Base64与改进IDEA混用的图像加密算法  

Image Encryption Algorithm Mixed with Base64 and Improved IDEA

作　　者：张毅 ZHANG Yi(Zhejiang Wanli University,Ningbo Zhejiang 315100)

机构地区：[1]浙江万里学院大数据与软件工程学院,浙江宁波315100

出　　处：《浙江万里学院学报》2022年第5期91-96,共6页Journal of Zhejiang Wanli University

基　　金：浙江省教育厅科研计划基金项目(Y202045541)。

摘　　要：介绍了一种基于Base64和改进IDEA的混合图像加密算法,先将图像进行Base64编码成可见ASCII字符以保证其传输的可靠性,再用改进IDEA算法对Base64编码进行加密,IDEA算法存在弱密钥,改进的IDEA子密钥扩展算法可以有效消除其弱密钥。改进了IDEA加密流程,增强了密文的明文依赖性并提高了算法的混淆性。接收端接收到密文后先用改进IDEA算法进行解密,再进行Base64解码即可还原图像。算法具备轻量级特点,适用于移动终端等硬件性能低的设备。This paper introduces a hybrid image encryption algorithm based on Base64 and improved IDEA.Firstly,the image is Base64 encoded into visible ASCII characters to ensure the reliability of its transmission,and then the improved IDEA algorithm encrypts the base64 encoding.The IDEA algorithm has a weak key,and the improved IDEA sub-key expansion algorithm can effectively eliminate its weak key.The IDEA encryption process is improved,the plaintext dependence of the ciphertext is enhanced,and the confusion of the algorithm is improved.After receiving the ciphertext,the receiver first decrypts it with the improved IDEA algorithm,and then decodes it with Base64 to restore the image.The algorithm has lightweight characteristics and is suitable for devices with low hardware performance such as mobile terminals.

关 键 词：BASE64 IDEA 弱密钥 图像 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]