大三的資料安全課程設計，，希望能對你的課設或專案有所幫助

一、題目要求

程式可以輸入日記內容
需要將日記內容進行加密
能夠將加密資料寫入區塊鏈
能夠讀取鏈上加密資料
讀取的加密資料進行解密
解密后在程式中顯示

二、模板規劃

讀取模板：

記錄模板：

三、原始碼

using System;
using System.Collections.Generic;
using BsvSimpleLibrary;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NBitcoin;
using NBitcoin.DataEncoders;
using BitcoinSVCryptor;

namespace 日記
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
           
        }
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if(textBox1.Text=="")
            {
                MessageBox.Show("私鑰不能為空");
            }
            string privateKeyStr = textBox1.Text;
            BitcoinSecret privateKey;
            try
            {
                privateKey = new BitcoinSecret(privateKeyStr);
                string network = "";
                if (privateKey.Network == Network.TestNet)
                {
                    network = bsvConfiguration_class.testNetwork;
                }
                else if (privateKey.Network == Network.Main)
                {
                    network = bsvConfiguration_class.mainNetwork;
                }
                else
                {
                    MessageBox.Show("網路錯誤！");
                }
                PubKey pubKey = privateKey.PubKey;  
                string pubkeyStr = pubKey.ToHex();
                KeyId pkhash = pubKey.Hash;
                string pkhashStr = pkhash.ToString();
                BitcoinAddress address = pkhash.GetAddress(privateKey.Network);
                string addressStr = address.ToString();
                string addrStr = privateKey.PubKeyHash.GetAddress(privateKey.Network).ToString();
                string destAddress = addressStr;
                string uri = bsvConfiguration_class.RestApiUri;
                Base58Encoder base58Encoder = new Base58Encoder();
                byte[] cipherBase58Bytes = base58Encoder.DecodeData(richTextBox3.Text);
                string plaintextStr = AES_class.AesDecrypt(cipherBase58Bytes, privateKeyStr);
                richTextBox2.Clear();
                richTextBox2.AppendText(plaintextStr + '\n');
                Task<RestApiAddressHistoryTx[]> addrHistoryTask = Task.Run(() =>
                {
                    RestApiAddressHistoryTx[] addrHistory2 = RestApi_class.getAddressHistory(uri, network, addrStr);
                    return addrHistory2;
                });
                addrHistoryTask.Wait();
                RestApiAddressHistoryTx[] addrHistory = addrHistoryTask.Result;
                List<string> txHashs = new List<string> { };

                for (int i = 0; i < addrHistory.Length; i++)
                {
                    txHashs.Add(addrHistory[i].TxHash);
                }
                Task<RestApiTransaction[]> transactionsTask = Task.Run(() =>
                {
                    RestApiTransaction[] transactionsTemp = new RestApiTransaction[txHashs.Count];
                    for (int i = 0; i < txHashs.Count; i++)
                    {
                        transactionsTemp[i] = RestApi_class.getTransaction(uri, network, txHashs[i]);
                    }
                    return transactionsTemp;
                });
                transactionsTask.Wait();
                RestApiTransaction[] transactions = transactionsTask.Result;
               List<string> opReturnDataStrings = new List<string> { };
                for (int i = 0; i < txHashs.Count; i++)
                {
                    opReturnDataStrings.Add(RestApi_class.getOpReturnData
                        (transactions[i], bsvConfiguration_class.encoding));
                }
                Console.WriteLine();
                foreach (var opReturnDataString in opReturnDataStrings)
                {
                    if (opReturnDataString != null)
                    {

                        try
                        {
                            byte[] tempBase58Bytes = base58Encoder.DecodeData(opReturnDataString);
                            richTextBox4.AppendText(opReturnDataString + '\n');
                            string tempDecrypt = AES_class.AesDecrypt(tempBase58Bytes, privateKeyStr);
                            richTextBox1.AppendText(tempDecrypt + '\n');
                        }
                        catch (Exception)
                        {
                            richTextBox1.AppendText(opReturnDataString);
                        }
                    }
                }
            }
            catch (Exception)
            {

                MessageBox.Show("私鑰無效！");
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            string wifPrivateKeyStr = textBox1.Text;
            BitcoinSecret privateKey = new BitcoinSecret(wifPrivateKeyStr);
            string privateKeyStr = privateKey.ToString();
            string plaintextStr = richTextBox2.Text;
            byte[] aesEncryptedTextBytes = AES_class.AesEncrypt(plaintextStr, privateKeyStr);

            Base58Encoder base58Encoder = new Base58Encoder();
            string base58TextData = base58Encoder.EncodeData(aesEncryptedTextBytes);

            string network = string.Empty;

            if (privateKey.Network == Network.TestNet)
            {
                network = bsvConfiguration_class.testNetwork;
            }
            else if (privateKey.Network == Network.Main)
            {
                network = bsvConfiguration_class.mainNetwork;
            }
            else
            {
                MessageBox.Show("網路錯誤！");
            }

            string destAddress = privateKey.PubKeyHash.GetAddress(privateKey.Network).ToString();
            try
            {
                Task<Dictionary<string, string>> sendTask = Task.Run(() =>
                {

                    Dictionary<string, string> response = bsvTransaction_class.send(privateKeyStr, 0, network, destAddress, null, base58TextData, 0.5, 0);
                    return response;

                });
                sendTask.Wait();

            }
            catch (Exception)

            {

                MessageBox.Show("發送失敗！");
            }
            richTextBox3.Clear();

            richTextBox3.Text += base58TextData;

            richTextBox1.AppendText(plaintextStr+'\n');
        }

        private void richTextBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void richTextBox4_TextChanged(object sender, EventArgs e)
        {
        }
        private void richTextBox4_TextChanged_1(object sender, EventArgs e)
        {

        }
        private void label5_Click(object sender, EventArgs e)
        {

        }

}

}

四、演示界面

初始界面如圖所示

本程式的健壯性有一定的保證，在默認私鑰為空時是不能讀取和記錄的

輸入無效的秘鑰也有處理：

在Electrum錢包中找到本賬戶的私鑰，如圖所示：

在輸入相應私鑰后，點擊讀取，讀取本賬戶鏈上的資訊，該資訊是經過Aes高級加密標準加密過的，讀取時讀到的是密文，在右上角輸出框中顯示
經過AES解密后還原其相應的明文在左上角輸出框，如圖所示

同時，控制臺中會顯示相應交易資訊的歷史記錄詳細資訊：
例如txid、哈希值、區塊大小等資訊

本地記錄資訊時在左下角的輸入框中輸入需要記錄上鏈的資訊，本例以”you are the best”為例，在輸入完成后點擊記錄按鈕，程式自動對明文進行加密，加密后的內容如右下角所示，
再將加密后的密文發送上鏈，同時在本地將記錄的資訊發送到左上角明文輸出框中

上鏈完成后，其區塊資訊在控制臺中顯示如圖：

我們可以在whatsonchain網站中根據控制臺提供的資訊查詢交易;

可以看到本交易密文和網站上記錄的內容一致：