JPEG Image Encryption Algorithm Based on the Recomposition of DCT Quantization Coefficients

WANG Fang-chao; LI Bin; ZHOU Jia-hong

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JPEG Image Encryption Algorithm Based on the Recomposition of DCT Quantization Coefficients

更新时间：2026-09-04

- JPEG Image Encryption Algorithm Based on the Recomposition of DCT Quantization Coefficients
- Vol. 31, Issue 8, Pages: 139-143(2014)
- 作者机构：
  
  镇江船艇学院,江苏,镇江,212000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2014
- 稿件说明：
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王方超, 李斌, 周佳虹. 基于DCT量化系数重组的JPEG图像加密算法[J]. 微电子学与计算机, 2014, 31(8): 139-143.

WANG Fang-chao, LI Bin, ZHOU Jia-hong. JPEG Image Encryption Algorithm Based on the Recomposition of DCT Quantization Coefficients[J]. 2014, 31(8): 139-143.
王方超, 李斌, 周佳虹. 基于DCT量化系数重组的JPEG图像加密算法[J]. 微电子学与计算机, 2014, 31(8): 139-143. DOI：

WANG Fang-chao, LI Bin, ZHOU Jia-hong. JPEG Image Encryption Algorithm Based on the Recomposition of DCT Quantization Coefficients[J]. 2014, 31(8): 139-143. DOI：

摘要

整个加密算法分两个过程

首先在DCT变换之前对原始图像进行以8×8图像块为单位的统一图像置乱

使图像整体视觉效果上杂乱无章.其次

DCT变换量化系数之后

将相邻两个8×8系数块的低频系数组成一个新块

高频系数组成一个新块

分别进行块内的系数置乱

在改变原始图像频率成分的同时

可以减少改变零游程结构带来的加密对JPEG图像压缩影响

而且8×8系数块内的非零系数个数发生了变化

可以有效抵御统计非零系数个数攻击.

Abstract

The whole encryption algorithm includes two steps.Firstly

scramble the original image before the DCT transformation block by block with the size8×8;it makes the image disorderly and unsystematic.Secondly

after the quantization of the DCT coefficients

we recompose the double 8×8 DCT blocks border upon

put low coefficients into one 8×8block and put the high coefficients into another one.Shuffle the low coefficients block and high coefficients block with different ergodic matrixes.This algorithm could change the frequent structure while increase the compressed image data a little and change the number of the nonzero DCT coefficients so as to defend the nonzero-counting attack.

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