我正在尝试使用ACM和henon加密图像，加密成功，但是无法解密。问题是(问题解密是在对像素值进行XOR后，无法将其还原到初始位置)。
根据此加密方案:
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=5054653&contentType=Conference+Publications&queryText%3Dimage+encryption+henon
加密步骤为:
解密步骤为:
谢谢。
加密代码如下:
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"));
}
最佳答案
您应该将每个阶段分为两种方法:一种是执行，另一种是撤消。然后，您应该编写一小组测试，以生成数千个随机输入，并在每个输入上检查input.equals(undoIt(doIt(input)));或类似内容。
如果任何测试失败，您将知道从哪里开始寻找。