C# 简单聊天客户端服务器加密

我想用AES-256bit制作一个聊天客户端服务器，非常简单，但同时也非常安全。我也这么认为，当然，如果我错了，请告诉我。 各种客户端在“安全”文本框中输入密码（在任何地方都必须相同），在发送功能（客户端程序）中，客户端使用密码加密我放在另一个普通文本框中的消息，并将其发送到服务器；接收函数总是使用相同的密钥进行解密。服务器不应在加密级别执行任何操作。 我试过了，但我不知道它是否因为代码级别的原因而不起作用。 下面是我如何修改客户端上的发送和接收函数：send函数

// send the message to the server
private void SendMessage()
{
    if (txtMessage.Lines.Length >= 1)
    {
        byte[] passwordBytes = GetPasswordBytes();
        encrypted_message = AES.Encrypt(txtMessage.Text, passwordBytes);
        swSender.WriteLine(encrypted_message);
        swSender.Flush();
        txtMessage.Lines = null;
    }
    txtMessage.Text = "";
}

接收功能：

private void ReceiveMessages()
{
    // Receive the response from the server
    srReceiver = new StreamReader(tcpServer.GetStream());
    // If the first character of the response is 1, connection was successful
    string ConResponse = srReceiver.ReadLine();
    // If the first character is a 1, connection was successful
    if (ConResponse[0] == '1')
    {
        // Update the form to tell it we are now connected
        this.Invoke(new UpdateLogCallback(this.UpdateLog), new object[] { "Connessione avvenuta con successo!" });
    }
    else // If the first character is not a 1 (probably a 0), the connection was unsuccessful
    {
        string Reason = "Non connesso: ";
        // Extract the reason out of the response message. The reason starts at the 3rd character
        Reason += ConResponse.Substring(2, ConResponse.Length - 2);
        // Update the form with the reason why we couldn't connect
        this.Invoke(new CloseConnectionCallback(this.CloseConnection), new object[] { Reason });
        // Exit the method
        return;
    }
    // While we are successfully connected, read incoming lines from the server
    while (Connected == true)
    {
            try
            {
                // Show the messages decrypted in the log TextBox
                this.Invoke(new UpdateLogCallback(this.MessageUpdateLog), new object[] { srReceiver.ReadLine() });

            }
            catch
            {
                try
                {
                this.Invoke(new UpdateLogCallback(this.UpdateLog), new object[] { srReceiver.ReadLine() });
                }
                catch { }
            }
    }
}

// This method is called from a different thread in order to update the log TextBox
private void UpdateLog(string strMessage)
{
    txtLog.AppendText(strMessage + "\r\n");
}

//Decrypt the messages incoming from the other client
private void MessageUpdateLog(string strMessage_de)
{
    byte[] passwordBytes = GetPasswordBytes();
    strMessage_de = AES.Decrypt(strMessage_de, passwordBytes);
    // Append text also scrolls the TextBox to the bottom each time
    txtLog.AppendText(strMessage_de + "\r\n");
}

---

为了不让这项工作变得困难，我想到了通过语音交换加密密码（密钥），因为这将是一个供个人使用的聊天室。

这里有问题吗？是的，因为这不起作用。程序在逻辑层或代码层不工作？这里有问题吗？是的，因为这不工作。程序不在逻辑层或代码层工作？