With the aim to ensure privacy and security of secret message, an enhanced reversible data hiding algorithm in encrypted as well as compressed domain is proposed here. After compression of grey-scale image using absolute moment block truncation coding (AMBTC) method, pixels of AMBTC compressed image is segmented into two types - seed pixels (2^k…255) and remaining pixels are called non-seed pixels. Now, embedded k, (k ≥ 1) binary bits of secret message by changed over it into base₁₀ numeral framework at seed pixels of AMBTC compressed image whereas seed pixel is divided into two individual units which are encrypted through Paillier cryptosytem separately. Highlight of proposed method is to embed variable size secret message at seed pixels of AMBTC compressed image without any occurrence of overflow problem. Experimental study revealed that for all type of test images, proposed method altogether beated all the compared methods in its ability to embed secret message and precisely recover it with a PSNR value of \(\infty \) dB between cover image and reconstructed image too.

为了确保秘密消息的私密性和安全性，本文提出了一种在加密域和压缩域中的增强型可逆数据隐藏算法。使用绝对矩块截断编码（AMBTC）方法压缩灰度图像后，将AMBTC压缩图像的像素分为两种类型-种子像素（2 ^k …255）和其余像素称为非种子像素。现在，嵌入式ķ，（ķ ≥1）切换成秘密信息的二进制位b一个小号ë ₁₀AMBTC压缩图像的种子像素处的数字框架，而种子像素被分为两个单独的单元，分别通过Paillier密码系统进行加密。该方法的重点是在AMBTC压缩图像的种子像素处嵌入可变大小的秘密消息，而不会出现溢出问题。实验研究表明，对于所有类型的测试图像，该方法在嵌入秘密消息并准确地恢复秘密消息的能力方面都优于所有比较方法，而且在覆盖图像和重建图像之间的PSNR值为\（\ infty \） dB。