DCT加密(Java((伪

最新推荐文章于 2021-03-04 11:26:37 发布

原创最新推荐文章于 2021-03-04 11:26:37 发布 · 718 阅读

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本文探讨了使用MATLAB进行图像加密与解密的过程，包括输入图像、密钥处理、输出图像的操作，以及如何实现灰度值的改变来达到加密的目的。

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</pre>没弄懂原理写个鬼代码啊(摔<p></p><p>还是觉得MATLAB超级不好用....要不是库多hhhhh</p><p>还是去看原理去了(逃</p><p></p><p>这是加密代码</p><p></p><pre name="code" class="java">package wjoker;

import java.awt.Color;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

public class jiami {

	static String host = "H:\\Workspaces\\MyEclipse 2015 CI\\DCT\\src\\6_1.jpg";
	static String key = "H:\\Workspaces\\MyEclipse 2015 CI\\DCT\\src\\key.jpg";
	static String output = "H:\\Workspaces\\MyEclipse 2015 CI\\DCT\\src\\out1.jpg";
	//static String output2 = "H:\\Workspaces\\MyEclipse 2015 CI\\DCT\\src\\out2.jpg";
	static String readImageFormat = "jpg";
	static String writeImageFormat = "jpg";
	static int a_x = 0;
	static int a_y = 0;
	static int b_x = 7;
	static int b_y = 0;
	static int weight = 400;
	static int hight = 560;
	static int block = 8;
	static int weight_size = weight/block;
	static int hight_size = hight/block;
	
	public static void main(String[] args) {
		BufferedImage bi_host = null;
		BufferedImage bi_key = null;
		BufferedImage bi_output = null;
		
		bi_host = input_img(host, readImageFormat);
		bi_key = input_img_min(key, readImageFormat);
		bi_output = bi_host;
		
		System.out.println((bi_host == null));
		System.out.println((bi_output == null));
		
		change(bi_host, bi_key, bi_output);
		
		output_img(bi_output, writeImageFormat, output);
		
	}
	
	
	
	public static BufferedImage input_img(String input_File,String readImageFormat){
		FileInputStream fis = null;
		ImageInputStream iss = null;
		BufferedImage bi = null;
		
		try {
			fis = new FileInputStream(input_File);
			Iterator it = ImageIO.getImageReadersByFormatName(readImageFormat);
			ImageReader reader = (ImageReader) it.next();
			
			try {
				iss = ImageIO.createImageInputStream(fis);
				reader.setInput(iss,true);
				ImageReadParam param = reader.getDefaultReadParam();
				Rectangle rect = new Rectangle(0,0,400,560);
			
				param.setSourceRegion(rect);
				bi = reader.read(0,param);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return bi;
		
	}
	
	public static BufferedImage input_img_min(String input_File,String readImageFormat){
		FileInputStream fis = null;
		ImageInputStream iss = null;
		BufferedImage bi = null;
		
		try {
			fis = new FileInputStream(input_File);
			Iterator it = ImageIO.getImageReadersByFormatName(readImageFormat);
			ImageReader reader = (ImageReader) it.next();
			
			try {
				iss = ImageIO.createImageInputStream(fis);
				reader.setInput(iss,true);
				ImageReadParam param = reader.getDefaultReadParam();
				Rectangle rect = new Rectangle(0,0,100,140);
			
				param.setSourceRegion(rect);
				bi = reader.read(0,param);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return bi;
		
	}
	
	public static void output_img(BufferedImage bi,String writeImageFormat,String output_File){
		try {
			ImageIO.write(bi, writeImageFormat, new File(output_File));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public static BufferedImage change(BufferedImage bi_host,BufferedImage bi_key,BufferedImage bi_output){
		
		int i,j;
		
		
		int rgb_a,rgb_b,rgb_key;
		boolean flag;
		
		
		
		for(i=0;i<weight_size;i++){
			for(j=0;j<hight_size;j++){
				rgb_a = getGrey(bi_host.getRGB(i*block+a_x, j*block+a_y));
				rgb_b = getGrey(bi_host.getRGB(i*block+b_x, j*block+b_y));
				rgb_key = getGrey(bi_key.getRGB(i, j));
				
				if(rgb_a>rgb_b)//key = 0
					flag = true;
				else //key = 256
					flag = false;
				
				if(rgb_key > 0){
					if(flag){
						int tmp = (rgb_a+rgb_b)/2;
						rgb_a = tmp-1;
						rgb_b = tmp+1;
					}
				} else {
					if(!flag){
						int tmp = (rgb_a+rgb_b)/2;
						rgb_a = tmp+1;
						rgb_b = tmp-1;
					}
				}
				
				bi_output.setRGB(i*block+a_x, j*block+a_y, new Color(rgb_a,rgb_a,rgb_a).getRGB());
				bi_output.setRGB(i*block+b_x, j*block+b_y, new Color(rgb_b,rgb_b,rgb_b).getRGB());
			}
		}
		
		return bi_output;
	}

	public static int getGrey(int rgb){
		int r = (rgb >> 16) & 0xff;//取出次高位（16-23）红色分量的信息
        int g = (rgb >> 8) & 0xff;//取出中位（8-15）绿色分量的信息
        int b = rgb & 0xff;//取出低位（0-7）蓝色分量的信息
        return (r+g+b)/3;
	}
	
}

这是解密代码

package wjoker;

import java.awt.Color;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

public class jiemi {
	static String host = "H:\\Workspaces\\MyEclipse 2015 CI\\DCT\\src\\out1.jpg";
	static String key = "H:\\Workspaces\\MyEclipse 2015 CI\\DCT\\src\\key.jpg";
	//static String output = "H:\\Workspaces\\MyEclipse 2015 CI\\DCT\\src\\out1.jpg";
	static String output = "H:\\Workspaces\\MyEclipse 2015 CI\\DCT\\src\\out2.jpg";
	static String readImageFormat = "jpg";
	static String writeImageFormat = "jpg";
	static int a_x = 0;
	static int a_y = 0;
	static int b_x = 7;
	static int b_y = 0;
	static int weight = 400;
	static int hight = 560;
	static int block = 8;
	static int weight_size = weight/block;
	static int hight_size = hight/block;
	
	public static void main(String[] args) {
		BufferedImage bi_host = null;
		BufferedImage bi_key = null;
		BufferedImage bi_output = null;
		

		bi_host = input_img(host, readImageFormat);
		bi_key  = input_img_min(key, readImageFormat);
		bi_output = bi_key;
		
		
		output_img(bi_output, writeImageFormat, output);
	}
	
	
	
	public static BufferedImage input_img(String input_File,String readImageFormat){
		FileInputStream fis = null;
		ImageInputStream iss = null;
		BufferedImage bi = null;
		
		try {
			fis = new FileInputStream(input_File);
			Iterator it = ImageIO.getImageReadersByFormatName(readImageFormat);
			ImageReader reader = (ImageReader) it.next();
			
			try {
				iss = ImageIO.createImageInputStream(fis);
				reader.setInput(iss,true);
				ImageReadParam param = reader.getDefaultReadParam();
				Rectangle rect = new Rectangle(0,0,400,560);
			
				param.setSourceRegion(rect);
				bi = reader.read(0,param);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return bi;
		
	}
	
	public static BufferedImage input_img_min(String input_File,String readImageFormat){
		FileInputStream fis = null;
		ImageInputStream iss = null;
		BufferedImage bi = null;
		
		try {
			fis = new FileInputStream(input_File);
			Iterator it = ImageIO.getImageReadersByFormatName(readImageFormat);
			ImageReader reader = (ImageReader) it.next();
			
			try {
				iss = ImageIO.createImageInputStream(fis);
				reader.setInput(iss,true);
				ImageReadParam param = reader.getDefaultReadParam();
				Rectangle rect = new Rectangle(0,0,100,140);
			
				param.setSourceRegion(rect);
				bi = reader.read(0,param);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return bi;
		
	}
	
	
	public static void output_img(BufferedImage bi,String writeImageFormat,String output_File){
		try {
			ImageIO.write(bi, writeImageFormat, new File(output_File));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public static int getGrey(int rgb){
		int r = (rgb >> 16) & 0xff;//取出次高位（16-23）红色分量的信息
        int g = (rgb >> 8) & 0xff;//取出中位（8-15）绿色分量的信息
        int b = rgb & 0xff;//取出低位（0-7）蓝色分量的信息
        return (r+g+b)/3;
	}
	
	public static void change(BufferedImage bi_host,BufferedImage bi_output){
		int i,j;
		int rgb_a,rgb_b;
		boolean flag;
		
		for(i=0;i<weight_size;i++){
			for(j=0;j<hight_size;j++){
				rgb_a = getGrey(bi_host.getRGB(i*block+a_x, j*block+a_y));
				rgb_b = getGrey(bi_host.getRGB(i*block+b_x, j*block+b_y));
				if(rgb_a>rgb_b)
					bi_output.setRGB(i, j, new Color(0,0,0).getRGB());
				else 
					bi_output.setRGB(i, j, new Color(255,255,255).getRGB());
			}
		}
		
	}
	
}

还是那个坑爹的绝对路径烦死爹了,

好了,荆轲刺秦王.