C# Bitmap圖像加密與解密技術

在 C# 中實現圖像加密與解密可以使用以下步驟：

1. 加密圖像:

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

public static void EncryptImage(string inputImageFile, string outputImageFile, string key)
{
    Bitmap originalImage = new Bitmap(inputImageFile);

    for (int i = 0; i < originalImage.Width; i++)
    {
        for (int j = 0; j < originalImage.Height; j++)
        {
            Color pixel = originalImage.GetPixel(i, j);
            int red = pixel.R ^ key.GetHashCode();
            int green = pixel.G ^ key.GetHashCode();
            int blue = pixel.B ^ key.GetHashCode();

            Color encryptedPixel = Color.FromArgb(red, green, blue);
            originalImage.SetPixel(i, j, encryptedPixel);
        }
    }

    originalImage.Save(outputImageFile, ImageFormat.Png);
}

2. 解密圖像:

public static void DecryptImage(string inputImageFile, string outputImageFile, string key)
{
    Bitmap encryptedImage = new Bitmap(inputImageFile);

    for (int i = 0; i < encryptedImage.Width; i++)
    {
        for (int j = 0; j < encryptedImage.Height; j++)
        {
            Color pixel = encryptedImage.GetPixel(i, j);
            int red = pixel.R ^ key.GetHashCode();
            int green = pixel.G ^ key.GetHashCode();
            int blue = pixel.B ^ key.GetHashCode();

            Color decryptedPixel = Color.FromArgb(red, green, blue);
            encryptedImage.SetPixel(i, j, decryptedPixel);
        }
    }

    encryptedImage.Save(outputImageFile, ImageFormat.Png);
}

3. 調用加密和解密方法：

string inputImageFile = "inputImage.png";
string outputEncryptedImageFile = "encryptedImage.png";
string outputDecryptedImageFile = "decryptedImage.png";
string key = "secretKey";

EncryptImage(inputImageFile, outputEncryptedImageFile, key);
DecryptImage(outputEncryptedImageFile, outputDecryptedImageFile, key);

通過以上步驟，您可以在 C# 中實現簡單的圖像加密和解密技朽。請注意，此處使用的加密算法較為簡單，您也可以選擇更加復雜的加密算法來提高安全性。