Question

我正在尝试使用ACM和henon加密图像，加密成功，但无法解密。问题是（问题解密是在XORing像素值之后，它无法将其恢复到初始位置）。

根据此加密方案： http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=5054653&contentType=Conference+Publications&queryText%3Dimage+encryption+henon

加密步骤是：

阅读图片
像素提取
使用ACM随机播放像素
生成henon伪随机
圆形的henon伪随机
XORing shufle pixel vaue with henon pseudorandom
写图片
密码图像完成

解密步骤是：

读取密码图片
像素提取
生成henon伪随机
圆形的henon伪随机
XORing shufle pixel vaue with henon pseudorandom
使用反ACM恢复像素位置
写图片
图片已恢复

感谢。

以下加密代码：

  img = ImageIO.read(new File("5x5grayscale.bmp"));    
  Raster pixel = img.getData();               
  pxl = new int[img.getWidth()][img.getHeight()];
  pxl2 = new int[img.getWidth()][img.getHeight()];           

  for(int j=0;j<img.getHeight();j++){ 
    for(int i=0;i<img.getWidth();i++){                 
      pxl[i][j]= pixel.getSample(i, j, 0);  
      pxl2[i][j]= pixel.getSample(i, j, 0);  
    }                                                                       
  }           

  // shuffe pixel ACM iterration 1
  System.out.println("shuffle iteration  1");
  for(int i=0;i<5;i++){
    for(int j=0;j<5;j++){                 
      x[xx]=(1*i + c*j)%5;            
      y[xx]=(d*i + e*j)%5; 
      //System.out.println("-new coordinate ="+i+" , "+j+"="+x[xx]+","+y[xx]);
      xx++; 
    }
  }

  //shuffle pixel ACM 2 sd 10
  for(int k=0;k<9;k++){
    System.out.println("shuffle iteration "+(k+2));
    xx=0; 
    for(int i=0;i<5;i++){
      for(int j=0;j<5;j++){                 
        xtemp = x[xx];
        ytemp = y[xx];
        x[xx] = (1*xtemp + c*ytemp) % 5;
        y[xx] = (d*xtemp + e*ytemp) % 5;   

        System.out.println("-new coordinate="+i+" , "+j+"="+x[xx]+","+y[xx]);
        xx++; 
      }
    }              
  } 

  xx=0; 
  for (int a =0;a<5;a++){
    for(int b=0;b<5;b++){
      pxl[a][b]= pxl2[x[xx]][y[xx]];
      xx++;
      //System.out.println(pxl[a][b]);
    }
  }

  System.out.println("===================================henon============================");
  double k[] = new  double[102]; 
  int inter[] = new int [102];

  k[0] = 0.01;
  k[1] = 0.02; 
  double a=1.4;
  double b=0.3;


  System.out.println("generate pseudo random");
  for(int i=0;i<100;i++){                       
    k[i+2] =1-a*(Math.pow(k[i+1], 2))+b*k[i];
    // System.out.println(k[i]);            
  }  

  System.out.println("after rounded");
  for(int i=0;i<100;i++){
    inter[i]= (int) Math.round((k[i]*65536)%256);
    if(inter[i]<0){
      inter[i]=inter[i]+256;
    }
    //    System.out.println(inter[i]);
  }

  System.out.println("setelah xor");
  System.out.println("setelah xor");
  cipher = new int[img.getWidth()][img.getHeight()];
  int z=0;  
  for(int ii=0;ii<img.getWidth();ii++){
    for(int jj=0;jj<img.getHeight();jj++){
      cipher[ii][jj]=inter[z]^pxl[ii][jj];
      // System.out.println(cipher[ii][jj]);
      z++;
    }
  }

  image = new BufferedImage(img.getWidth(),img.getHeight(),BufferedImage.TYPE_BYTE_GRAY);          
  WritableRaster write = image.getRaster();                 

  for(int ii=0;ii<img.getHeight();ii++){
    for(int jj=0;jj<img.getWidth();jj++){          
      write.setSample(jj, ii, 0,cipher[jj][ii] );   
    }  
  }  

  ImageIO.write(image, "bmp", new File("acmhenonenkrip5x5.bmp"));  
  System.out.println("cipher image done");           
}

解密以下代码：

public static void main (String[] args) throws java.lang.Exception
{
  int c =2;
  int d = 2;
  int e = c*d+1;
  int x[]= new int[100];
  int y[]= new int[100];
  int xx=0;
  int xtemp;
  int ytemp;
  int sama=1;
  BufferedImage img ;
  BufferedImage image = null;
  int [][]pxl = null ;
  int [][]pxl2 = null ;
  int [][]cipher=null;

  img = ImageIO.read(new File("acmhenonenkrip5x5.bmp"));    
  Raster pixel = img.getData();     

  pxl = new int[img.getWidth()][img.getHeight()];
  pxl2 = new int[img.getWidth()][img.getHeight()];


  for(int j=0;j<img.getHeight();j++){ 
    for(int i=0;i<img.getWidth();i++){                 
      pxl[i][j]= pixel.getSample(i, j, 0);  
      pxl2[i][j]= pixel.getSample(i, j, 0);  
    }                                                                       
  }   

  System.out.println("===================================henon============================");
  double k[] = new  double[30];            int inter[] = new int [30];

  k[0] = 0.01;
  k[1] = 0.02; 
  double a=1.4;
  double b=0.3;


  System.out.println("generate pseudo random");
  for(int i=0;i<27;i++){                       
    k[i+2] =1-a*(Math.pow(k[i+1], 2))+b*k[i];
    // System.out.println(k[i]);            
  }  

  System.out.println("after rounded");
  for(int i=0;i<27;i++){
    inter[i]= (int) Math.round((k[i]*65536)%256);
    if(inter[i]<0){
      inter[i]=inter[i]+256;
    }
    // System.out.println(inter[i]);
  }

  System.out.println("after  xor");
  cipher = new int[img.getWidth()][img.getHeight()];
  int z=0;  
  for(int ii=0;ii<img.getWidth();ii++){
    for(int jj=0;jj<img.getHeight();jj++){
      cipher[ii][jj]=inter[z]^pxl[ii][jj];
      // System.out.println(cipher[ii][jj]);
      z++;
    }
  }

  System.out.println("===================================inverseacm============================");

  System.out.println("decrypt iteration1");

  for(int i=0;i<5;i++){
    for(int j=0;j<5;j++){      
      x[xx]=((e*i) + (-c*j))%5; 
      if(x[xx]<0){
        x[xx]=x[xx]+5;
      }
      y[xx]=((-d*i) + (1*j))%5;  
      if(y[xx]<0){
        y[xx]=y[xx]+5;
      }
      // System.out.println(xx+"-new coordinate ="+i+","+j+"="+x[xx]+","+y[xx]);
      xx++; 
    }    
  }

  for(int iter=0;iter<9;iter++){
    System.out.println("decrypt iteration "+(iter+2));
    xx=0;  
    for(int i=0;i<5;i++){
      for(int j=0;j<5;j++){     
        xtemp = x[xx];
        ytemp = y[xx];
        x[xx]=((e*xtemp) + (-c*ytemp))%5; 
        if(x[xx]<0){
            x[xx]=x[xx]+5;
        }
        y[xx]=((-d*xtemp) + (1*ytemp))%5;  
        if(y[xx]<0){
          y[xx]=y[xx]+5;
        }
        // System.out.println(xx+"-new coordinate ="+i+","+j+"="+x[xx]+","+y[xx]);
        xx++; 
      }          
    }
  }    

  xx=0; 
  for(int ii=0;ii<img.getWidth();ii++){
    for(int jj=0;jj<img.getHeight();jj++){
      System.out.println("cip"+cipher[x[xx]][y[xx]]); //tracing pixel value of cipher
      xx++;     
    }            
  } 

  xx=0; 
  for(int ii=0;ii<img.getWidth();ii++){
    for(int jj=0;jj<img.getHeight();jj++){
      System.out.println("pxl"+pxl[x[xx]][y[xx]]); //tracing pixel value of pxl
      xx++;     
    }
  }

  image = new BufferedImage(img.getWidth(),img.getHeight(),BufferedImage.TYPE_BYTE_GRAY);          
  WritableRaster write = image.getRaster();                 

  for(int ii=0;ii<img.getHeight();ii++){
    for(int jj=0;jj<img.getWidth();jj++){          
      write.setSample(jj, ii, 0,cipher[jj][ii] );                             
    }  
  }  

  ImageIO.write(image, "bmp", new File("acmhenondekrip5x5.bmp"));  
}

Answer 1

您应该将每个阶段分为两个方法：一个要做，另一个要撤消。然后你应该编写一组简短的测试来生成数千个随机输入，并在每个测试中检查input.equals(undoIt(doIt(input)));或类似的东西。

如果任何测试失败，您将知道从哪里开始寻找。

图像加密，为什么它无法解密？

1 个答案: