C#简单自定义加密

Question

我在C#.NET中进行了简单的自定义加密,加密成功通过,但解密出错了.该算法非常直观,但我不知道为什么它的解密错误.这是我的代码:

 private void button1_Click(object sender, RoutedEventArgs e)
        {
            //Encrypting 
            byte[] initial_text_bytes = Encoding.UTF8.GetBytes(initial_text_tb.Text);
            byte[] secret_word_bytes = Encoding.UTF8.GetBytes(secret_word_tb.Text);
            byte[] encrypted_bytes = new byte[initial_text_bytes.Length];




            int secret_word_index = 0;
            for (int i=0; i < initial_text_bytes.Length; i++)
            {
                if (secret_word_index == secret_word_bytes.Length)
                {
                    secret_word_index = 0;
                }
                encrypted_bytes[i] = (byte)(initial_text_bytes[i] + initial_text_bytes[secret_word_index]);
                secret_word_index++;
            }



          //  String s = Encoding.UTF8.GetString(encrypted_bytes);
                //new String(Encoding.UTF8.GetChars(encrypted_bytes));

            text_criptat_tb.Text = Convert.ToBase64String(encrypted_bytes);


        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            //Decrypting
            byte[] initial_text_bytes = Encoding.UTF8.GetBytes(text_criptat_tb.Text);
            byte[] secret_word_bytes = Encoding.UTF8.GetBytes(secret_word_tb.Text);
            byte[] encrypted_bytes = new byte[initial_text_bytes.Length];

            int secret_word_index = 0;
            for (int i = 0; i < initial_text_bytes.Length; i++)
            {
                if (secret_word_index == secret_word_bytes.Length)
                {
                    secret_word_index = 0;
                }
                encrypted_bytes[i] = (byte)(initial_text_bytes[i] - initial_text_bytes[secret_word_index]);
                secret_word_index++;
            }
           // String s = new String(Encoding.UTF8.GetChars(encrypted_bytes));

            initial_text_tb.Text = Convert.ToBase64String(encrypted_bytes);


        }

这是我加密时得到的: 这是我解密的时候: 谢谢

Answer 1

我看到代码有四个问题.

1.您正在从初始文本而不是秘密字添加字节.

这里:

encrypted_bytes[i] = (byte)(initial_text_bytes[i] + initial_text_bytes[secret_word_index]);

改为使用:

encrypted_bytes[i] = (byte)(initial_text_bytes[i] + secret_word_bytes[secret_word_index]);

2.您正在Encoding.UTF8.GetBytes尝试解码base-64字符串.

这里:

byte[] initial_text_bytes = Encoding.UTF8.GetBytes(text_criptat_tb.Text);

改为使用:

byte[] initial_text_bytes = Convert.FromBase64String(text_criptat_tb.Text);

你正在从秘密词的初始文本intead中减去字节.

这里:

encrypted_bytes[i] = (byte)(initial_text_bytes[i] - initial_text_bytes[secret_word_index]);

改为使用:

encrypted_bytes[i] = (byte)(initial_text_bytes[i] - secret_word_bytes[secret_word_index]);

4.您正在Convert.ToBase64String尝试解码UTF-8数据.

这里:

initial_text_tb.Text = Convert.ToBase64String(encrypted_bytes);

改为使用:

initial_text_tb.Text = Encoding.UTF8.GetString(encrypted_bytes);