Question

这里我尝试以加密形式将一些文本写入本地文件。但是当我在本地看到文件时，数据不是加密形式。有人可以纠正我。

    //Writing to file
    StorageFolder folder = Windows.Storage.ApplicationData.Current.LocalFolder;
    // textBlock.Text = folder.Path;
    StorageFile sampleFile = await folder.CreateFileAsync("sample.txt", CreationCollisionOption.ReplaceExisting);
    var buffer = Windows.Security.Cryptography.CryptographicBuffer.ConvertStringToBinary(
                "Text input into sample.txt file", Windows.Security.Cryptography.BinaryStringEncoding.Utf8);
    await Windows.Storage.FileIO.WriteBufferAsync(sampleFile, buffer);

    //Reading from file
    StorageFolder storageFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
    sampleFile = await storageFolder.GetFileAsync("sample.txt");
    string text = await Windows.Storage.FileIO.ReadTextAsync(sampleFile);
    // textBlock.Text = text;

Answer 1

您可以使用CryptographicEngine class实际执行加密和解密。

但是上面的@Neil's评论 - 你在哪里存储解密密钥？如果密钥存储为应用程序的一部分，则它并不能真正保护任何内容。如果它来自用户输入（例如，他们每次输入的密码+可选的盐），那就更好了。

Answer 2

如果你想在代码中保守秘密，可以使用混淆。然而，这也可能被打破，但至少它会使打破安全性变得更加困难，因此尝试和破解它的动力就会减少。最后，所需的保护量取决于您要隐藏的数据的重要性。

Answer 3

加密或解密存储文件UWP

 public static async Task<StorageFile> EncryptStorageFileLocalUserAsync(this StorageFile FileForEncryption)
    {
        //"LOCAL = user"
        IBuffer data = await FileIO.ReadBufferAsync(FileForEncryption);
        IBuffer SecuredData = await DataProtectionStream("LOCAL = user", data);
        var  EncryptedFile = await ApplicationData.Current.TemporaryFolder.CreateFileAsync(
          "EncryptedFile" + FileForEncryption.FileType, CreationCollisionOption.ReplaceExisting);
        await FileIO.WriteBufferAsync(EncryptedFile, SecuredData);
        return EncryptedFile;
       // Reporting.DisplayMessage( "File encryption successfull. File stored at " + EncryptedFile.Path + "\n\n");

    }
    public static async Task<StorageFile> DecryptStorageFileLocalUserAsync(this StorageFile EncryptedFile)
    {

        IBuffer data = await FileIO.ReadBufferAsync(EncryptedFile);
        IBuffer UnSecuredData = await DataUnprotectStream(data);

         var DecryptedFile = await ApplicationData.Current.TemporaryFolder.CreateFileAsync(
          "DecryptedFile" + EncryptedFile.FileType, CreationCollisionOption.ReplaceExisting);
        await FileIO.WriteBufferAsync(DecryptedFile, UnSecuredData);
       // Reporting.DisplayMessage("File decryption successfull. File stored at " + DecryptedFile.Path + "\n\n");
        return DecryptedFile;

    }

在c＃windows 10通用应用程序开发中以加密形式将数据存储到文件中

3 个答案: