C#加密文本输出

Question

我创建了一些使用StreamWriter将数据导出到文本文件的小程序,然后我使用StreamReader读回它们.这很好用,我做了我需要做的事情,但我想知道是否有一种方法可以保存这些信息,而无需用户有意或无意地访问或修改它.我在文本文件中会有一个例子,如果勾选了一个复选框,当你勾选它时会将"Ticked"输出到一个文本文件,当程序重新打开时,我知道该表单处于什么状态时关门了.我显然不想继续使用文本文件.有没有人对如何在没有用户修改它的情况下轻松存储这些信息有任何想法？非常感谢你.

Answer 1

最简单的方法是Base-64编码/解码此文本.这不安全,但会阻止临时用户修改数据.

static public string EncodeTo64(string toEncode)
{
  byte[] toEncodeAsBytes
        = System.Text.ASCIIEncoding.ASCII.GetBytes(toEncode);
  string returnValue
        = System.Convert.ToBase64String(toEncodeAsBytes);
  return returnValue;
}

static public string DecodeFrom64(string encodedData)
{
  byte[] encodedDataAsBytes
      = System.Convert.FromBase64String(encodedData);
  string returnValue =
     System.Text.ASCIIEncoding.ASCII.GetString(encodedDataAsBytes);
  return returnValue;
}

编辑:真正的加密

#region Encryption

        string passPhrase = "Pasword";        // can be any string
        string saltValue = "sALtValue";        // can be any string
        string hashAlgorithm = "SHA1";             // can be "MD5"
        int passwordIterations = 7;                  // can be any number
        string initVector = "~1B2c3D4e5F6g7H8"; // must be 16 bytes
        int keySize = 256;                // can be 192 or 128

        private string Encrypt(string data)
        {
            byte[] bytes = Encoding.ASCII.GetBytes(this.initVector);
            byte[] rgbSalt = Encoding.ASCII.GetBytes(this.saltValue);
            byte[] buffer = Encoding.UTF8.GetBytes(data);
            byte[] rgbKey = new PasswordDeriveBytes(this.passPhrase, rgbSalt, this.hashAlgorithm, this.passwordIterations).GetBytes(this.keySize / 8);
            RijndaelManaged managed = new RijndaelManaged();
            managed.Mode = CipherMode.CBC;
            ICryptoTransform transform = managed.CreateEncryptor(rgbKey, bytes);
            MemoryStream stream = new MemoryStream();
            CryptoStream stream2 = new CryptoStream(stream, transform, CryptoStreamMode.Write);
            stream2.Write(buffer, 0, buffer.Length);
            stream2.FlushFinalBlock();
            byte[] inArray = stream.ToArray();
            stream.Close();
            stream2.Close();
            return Convert.ToBase64String(inArray);
        }

        private string Decrypt(string data)
        {
            byte[] bytes = Encoding.ASCII.GetBytes(this.initVector);
            byte[] rgbSalt = Encoding.ASCII.GetBytes(this.saltValue);
            byte[] buffer = Convert.FromBase64String(data);
            byte[] rgbKey = new PasswordDeriveBytes(this.passPhrase, rgbSalt, this.hashAlgorithm, this.passwordIterations).GetBytes(this.keySize / 8);
            RijndaelManaged managed = new RijndaelManaged();
            managed.Mode = CipherMode.CBC;
            ICryptoTransform transform = managed.CreateDecryptor(rgbKey, bytes);
            MemoryStream stream = new MemoryStream(buffer);
            CryptoStream stream2 = new CryptoStream(stream, transform, CryptoStreamMode.Read);
            byte[] buffer5 = new byte[buffer.Length];
            int count = stream2.Read(buffer5, 0, buffer5.Length);
            stream.Close();
            stream2.Close();
            return Encoding.UTF8.GetString(buffer5, 0, count);
        }
        #endregion