The main challenge for American Standard Code for Information Interchange (ASCII) based image encryption methods is to increase security with less computational cost. Earlier, well known image encryption techniques are not only deficient in performance but also lacked in embedding of confidential data in an image using ASCII based methods. Therefore, this study aims to contribute an ASCII based efficient and secure image encryption method having additional feature of embedding confidential data in an image. Moreover, the embedding process is not static but it is dynamic as compared to the existing work. The novelty of proposed method encompasses optimal security, effective encryption speed and randomized embedding of secret data in an image even of having multi-operations. The proposed method was evaluated experimentally with variety of tests such as Pixel correlation analysis, Number of Pixels Change Rate (NPCR), Unified Average Changing Intensity (UACI), Histogram, Entropy, Peak Signal to Noise Ratio (PSNR), and Mean Square Error (MSE) including encryption decryption time. Thus the experimental results show that the proposed method is optimally secure and outperformed in image encryption as well as in randomized embedding of confidential data than the existing techniques.

基于美国信息交换标准码（ASCII）的图像加密方法的主要挑战是以更少的计算成本来提高安全性。早先，众所周知的图像加密技术不仅性能不足，而且缺乏使用基于ASCII的方法将机密数据嵌入图像中的能力。因此，本研究旨在提供一种基于ASCII的高效，安全的图像加密方法，该方法具有在图像中嵌入机密数据的附加功能。此外，与现有工作相比，嵌入过程不是静态的，而是动态的。所提出的方法的新颖性包括最优的安全性，有效的加密速度以及秘密数据在图像中的随机嵌入，甚至可以进行多次操作。通过各种测试对提议的方法进行了实验评估，例如像素相关性分析，像素数量变化率（NPCR），统一平均变化强度（UACI），直方图，熵，峰信噪比（PSNR）和均方误差（MSE），包括加密解密时间。因此，实验结果表明，与现有技术相比，该方法在图像加密以及机密数据的随机嵌入方面具有最佳的安全性和性能。