C# Bitmap图像加密与解密技术

在 C# 中实现图像加密与解密可以使用以下步骤：

1. 加密图像:

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. 解密图像:

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. 调用加密和解密方法：

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

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

通过以上步骤，您可以在 C# 中实现简单的图像加密和解密技朽。请注意，此处使用的加密算法较为简单，您也可以选择更加复杂的加密算法来提高安全性。