diff --git a/Base64.cs b/Base64.cs
new file mode 100644
index 0000000..4f7f9b0
--- /dev/null
+++ b/Base64.cs
@@ -0,0 +1,163 @@
+using System;
+using System.Text;
+
+namespace CMLeonOS
+{
+    /// <summary>
+    /// Cosmos裸机专属Base64编码/解码工具类
+    /// 无.NET原生Convert依赖，纯手写实现，适配Cosmos System2
+    /// </summary>
+    public static class Base64Helper
+    {
+        // Base64标准编码表（0-63对应），裸机环境直接硬编码，无需动态生成
+        private const string Base64Table = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+        /// <summary>
+        /// Base64编码（加密）：将字符串转为Base64编码串（默认UTF8编码）
+        /// </summary>
+        /// <param name="input">原始字符串</param>
+        /// <returns>Base64编码后的字符串</returns>
+        public static string Encode(string input)
+        {
+            // 空值校验，裸机环境需严格判空
+            if (string.IsNullOrEmpty(input))
+                return string.Empty;
+
+            // 将字符串转为UTF8字节数组（Cosmos支持基础UTF8/ASCII）
+            byte[] inputBytes = Encoding.UTF8.GetBytes(input);
+            // 调用字节数组的编码核心方法
+            return EncodeBytes(inputBytes);
+        }
+
+        /// <summary>
+        /// Base64编码（核心）：将二进制字节数组转为Base64编码串
+        /// 适配任意二进制数据（文件、网络流、字符串字节）
+        /// </summary>
+        /// <param name="inputBytes">原始二进制字节数组</param>
+        /// <returns>Base64编码后的字符串</returns>
+        public static string EncodeBytes(byte[] inputBytes)
+        {
+            if (inputBytes == null || inputBytes.Length == 0)
+                return string.Empty;
+
+            // 构建结果字符串，裸机用StringBuilder更高效
+            StringBuilder result = new StringBuilder();
+            int inputLength = inputBytes.Length;
+            // 按3字节为一组遍历，处理所有完整组
+            for (int i = 0; i < inputLength; i += 3)
+            {
+                // 取3个字节，不足的补0（位运算用，不修改原数组）
+                byte b1 = i < inputLength ? inputBytes[i] : (byte)0;
+                byte b2 = i + 1 < inputLength ? inputBytes[i + 1] : (byte)0;
+                byte b3 = i + 2 < inputLength ? inputBytes[i + 2] : (byte)0;
+
+                // 核心位运算：3字节(24位)拆分为4个6位
+                // 第一个6位：b1的高6位（右移2位，与0x3F过滤低2位）
+                int idx1 = (b1 >> 2) & 0x3F;
+                // 第二个6位：b1的低2位 + b2的高4位（左移4位 + b2右移4位，与0x3F过滤）
+                int idx2 = ((b1 & 0x03) << 4) | ((b2 >> 4) & 0x0F);
+                // 第三个6位：b2的低4位 + b3的高2位（左移2位 + b3右移6位，与0x3F过滤）
+                int idx3 = ((b2 & 0x0F) << 2) | ((b3 >> 6) & 0x03);
+                // 第四个6位：b3的低6位（与0x3F过滤高2位）
+                int idx4 = b3 & 0x3F;
+
+                // 根据索引取Base64字符，添加到结果
+                result.Append(Base64Table[idx1]);
+                result.Append(Base64Table[idx2]);
+
+                // 补位处理：不足3字节时，用=替代
+                result.Append(i + 1 < inputLength ? Base64Table[idx3] : '=');
+                result.Append(i + 2 < inputLength ? Base64Table[idx4] : '=');
+            }
+
+            return result.ToString();
+        }
+
+        /// <summary>
+        /// Base64解码（解密）：将Base64编码串转回原始字符串（默认UTF8编码）
+        /// </summary>
+        /// <param name="input">Base64编码串</param>
+        /// <returns>解码后的原始字符串</returns>
+        /// <exception cref="ArgumentException">Base64格式错误时抛出</exception>
+        public static string Decode(string input)
+        {
+            if (string.IsNullOrEmpty(input))
+                return string.Empty;
+
+            // 解码为字节数组，再转为UTF8字符串
+            byte[] outputBytes = DecodeToBytes(input);
+            return Encoding.UTF8.GetString(outputBytes);
+        }
+
+        /// <summary>
+        /// Base64解码（核心）：将Base64编码串转回原始二进制字节数组
+        /// 适配任意Base64编码的二进制数据
+        /// </summary>
+        /// <param name="input">Base64编码串</param>
+        /// <returns>解码后的二进制字节数组</returns>
+        /// <exception cref="ArgumentException">Base64格式错误时抛出</exception>
+        public static byte[] DecodeToBytes(string input)
+        {
+            if (string.IsNullOrEmpty(input))
+                return Array.Empty<byte>();
+
+            // 预处理：过滤所有非Base64有效字符（仅保留编码表字符和=）
+            StringBuilder cleanInput = new StringBuilder();
+            foreach (char c in input)
+            {
+                if (Base64Table.Contains(c) || c == '=')
+                    cleanInput.Append(c);
+            }
+            string base64 = cleanInput.ToString();
+            int inputLength = base64.Length;
+
+            // 基础格式校验：Base64长度必须是4的倍数
+            if (inputLength % 4 != 0)
+                throw new ArgumentException("Invalid Base64 string: Length is not a multiple of 4");
+
+            // 计算补位符数量（=的个数，只能是0/1/2）
+            int padCount = 0;
+            if (base64[inputLength - 1] == '=') padCount++;
+            if (base64[inputLength - 2] == '=') padCount++;
+
+            // 计算解码后的字节数：(4*分组数 - 补位符数) / 3
+            int outputLength = (inputLength * 6) / 8 - padCount;
+            byte[] outputBytes = new byte[outputLength];
+            int outputIndex = 0;
+
+            // 按4个字符为一组遍历，处理所有组
+            for (int i = 0; i < inputLength; i += 4)
+            {
+                // 取4个Base64字符，转换为对应的6位索引（0-63）
+                int idx1 = Base64Table.IndexOf(base64[i]);
+                int idx2 = Base64Table.IndexOf(base64[i + 1]);
+                // 补位的=索引为-1，转为0处理
+                int idx3 = i + 2 < inputLength ? Base64Table.IndexOf(base64[i + 2]) : 0;
+                int idx4 = i + 3 < inputLength ? Base64Table.IndexOf(base64[i + 3]) : 0;
+
+                // 基础校验：无效字符（索引为-1且非=）
+                if (idx1 == -1 || idx2 == -1 || (idx3 == -1 && base64[i+2] != '=') || (idx4 == -1 && base64[i+3] != '='))
+                    throw new ArgumentException("Invalid Base64 string: Contains invalid characters");
+
+                // 核心位运算：4个6位拼接为24位，拆分为3个字节
+                uint combined = (uint)((idx1 << 18) | (idx2 << 12) | (idx3 << 6) | idx4);
+                // 第一个字节：24位的高8位
+                byte b1 = (byte)((combined >> 16) & 0xFF);
+                // 第二个字节：24位的中间8位
+                byte b2 = (byte)((combined >> 8) & 0xFF);
+                // 第三个字节：24位的低8位
+                byte b3 = (byte)(combined & 0xFF);
+
+                // 将字节写入结果数组，根据补位符数量跳过多余字节
+                if (outputIndex < outputLength)
+                    outputBytes[outputIndex++] = b1;
+                if (outputIndex < outputLength)
+                    outputBytes[outputIndex++] = b2;
+                if (outputIndex < outputLength)
+                    outputBytes[outputIndex++] = b3;
+            }
+
+            return outputBytes;
+        }
+    }
+}
diff --git a/CMLeonOS.csproj b/CMLeonOS.csproj
index cd7da58..bfb4d5c 100644
--- a/CMLeonOS.csproj
+++ b/CMLeonOS.csproj
@@ -42,7 +42,8 @@
         <PackageReference Include="Cosmos.System2" Version="0.1.0-localbuild20260201071815" />
         <PackageReference Include="Cosmos.System2_Plugs" Version="0.1.0-localbuild20260201071815" />
         <PackageReference Include="CosmosFtpServer" Version="1.0.9" />
-        <PackageReference Include="IL2CPU.API" Version="0.1.0-localbuild20260202032053" />
+        <PackageReference Include="CosmosHttp" Version="1.0.4" />
+        <PackageReference Include="IL2CPU.API" Version="0.1.0-localbuild20260203125852" />
     </ItemGroup>
 
 </Project>
diff --git a/Shell.cs b/Shell.cs
index 879b7da..30ef5f7 100644
--- a/Shell.cs
+++ b/Shell.cs
@@ -10,6 +10,7 @@ using System.Threading;
 using System.Net;
 using System.Net.Sockets;
 using System.Text;
+using CosmosHttp.Client;
 using Cosmos.Core;
 using Cosmos.Core.Memory;
 using Cosmos.HAL;
@@ -194,6 +195,10 @@ namespace CMLeonOS
                         "  ping <ip>        - Ping IP address (5 times)",
                         "  tcpserver <port> - Start TCP server on specified port",
                         "  tcpclient <ip> <port> - Connect to TCP server",
+                        "  wget <url>       - Download file from URL",
+                        "  whoami          - Show current username",
+                        "  base64 encrypt <text> - Encode text to Base64",
+                        "  base64 decrypt <text> - Decode Base64 to text",
                         "  version          - Show OS version",
                         "  about            - Show about information",
                         "  help <page>      - Show help page (1-3)",
@@ -451,6 +456,15 @@ namespace CMLeonOS
                 case "tcpclient":
                     ConnectTcpClient(args);
                     break;
+                case "wget":
+                    DownloadFile(args);
+                    break;
+                case "whoami":
+                    ShowCurrentUsername();
+                    break;
+                case "base64":
+                    ProcessBase64Command(args);
+                    break;
                 default:
                     ShowError($"Unknown command: {command}");
                     break;
@@ -1888,5 +1902,186 @@ namespace CMLeonOS
                 ShowError($"TCP client error: {ex.Message}");
             }
         }
+
+        private void DownloadFile(string args)
+        {
+            string[] parts = args.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
+            
+            if (parts.Length == 0)
+            {
+                ShowError("Error: Please specify URL");
+                ShowError("Usage: wget <url> [output]");
+                return;
+            }
+            
+            string url = parts[0];
+            string outputPath = parts.Length > 1 ? parts[1] : "";
+            
+            Console.WriteLine("====================================");
+            Console.WriteLine("        WGET - File Downloader");
+            Console.WriteLine("====================================");
+            Console.WriteLine();
+            Console.WriteLine($"Downloading from: {url}");
+            
+            try
+            {
+                HttpRequest request = new HttpRequest();
+                
+                string domain = "";
+                string path = "/";
+                
+                if (url.StartsWith("http://"))
+                {
+                    url = url.Substring(7);
+                }
+                if (url.StartsWith("https://"))
+                {
+                    url = url.Substring(8);
+                }
+                
+                int slashIndex = url.IndexOf('/');
+                if (slashIndex == -1)
+                {
+                    domain = url;
+                }
+                else
+                {
+                    domain = url.Substring(0, slashIndex);
+                    path = url.Substring(slashIndex);
+                }
+                
+                if (string.IsNullOrWhiteSpace(domain))
+                {
+                    ShowError("Error: Invalid URL format");
+                    return;
+                }
+                
+                Console.WriteLine($"Domain: {domain}");
+                Console.WriteLine($"Path: {path}");
+                Console.WriteLine();
+                
+                request.Domain = domain;
+                request.Path = path;
+                request.Method = "GET";
+                
+                Console.WriteLine("Sending request...");
+                request.Send();
+                
+                if (request.Response == null)
+                {
+                    ShowError("Error: No response received");
+                    return;
+                }
+                
+                byte[] content = Encoding.ASCII.GetBytes(request.Response.Content);
+                
+                if (content == null || content.Length == 0)
+                {
+                    ShowError("Error: No content received");
+                    return;
+                }
+                
+                Console.WriteLine($"Downloaded {content.Length} bytes");
+                Console.WriteLine();
+                
+                if (string.IsNullOrWhiteSpace(outputPath))
+                {
+                    int lastSlash = path.LastIndexOf('/');
+                    if (lastSlash >= 0 && lastSlash < path.Length - 1)
+                    {
+                        outputPath = path.Substring(lastSlash + 1);
+                    }
+                    else
+                    {
+                        outputPath = "downloaded_file";
+                    }
+                }
+                
+                if (!outputPath.StartsWith("0:\\") && !outputPath.StartsWith("0:/"))
+                {
+                    outputPath = Path.Combine(prompt, outputPath);
+                }
+                
+                Console.WriteLine($"Saving to: {outputPath}");
+                
+                File.WriteAllBytes(outputPath, content);
+                
+                ShowSuccess($"File saved successfully: {outputPath}");
+            }
+            catch (Exception ex)
+            {
+                ShowError($"Download error: {ex.Message}");
+            }
+        }
+
+        private void ShowCurrentUsername()
+        {
+            Console.WriteLine("====================================");
+            Console.WriteLine("        Current User");
+            Console.WriteLine("====================================");
+            Console.WriteLine();
+            Console.WriteLine($"Username: {userSystem.CurrentUsername}");
+            Console.WriteLine();
+        }
+
+        private void ProcessBase64Command(string args)
+        {
+            string[] parts = args.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
+            
+            if (parts.Length == 0)
+            {
+                ShowError("Error: Please specify subcommand");
+                ShowError("Usage: base64 encrypt <text> | base64 decrypt <text>");
+                return;
+            }
+            
+            string subcommand = parts[0].ToLower();
+            
+            if (subcommand != "encrypt" && subcommand != "decrypt")
+            {
+                ShowError("Error: Invalid subcommand");
+                ShowError("Usage: base64 encrypt <text> | base64 decrypt <text>");
+                return;
+            }
+            
+            if (parts.Length < 2)
+            {
+                ShowError("Error: Please specify text to process");
+                ShowError($"Usage: base64 {subcommand} <text>");
+                return;
+            }
+            
+            string text = string.Join(" ", parts, 1, parts.Length - 1);
+            
+            Console.WriteLine("====================================");
+            Console.WriteLine("        Base64");
+            Console.WriteLine("====================================");
+            Console.WriteLine();
+            
+            try
+            {
+                if (subcommand == "encrypt")
+                {
+                    string encoded = Base64Helper.Encode(text);
+                    Console.WriteLine($"Original: {text}");
+                    Console.WriteLine();
+                    Console.WriteLine($"Encoded: {encoded}");
+                }
+                if (subcommand == "decrypt")
+                {
+                    string decoded = Base64Helper.Decode(text);
+                    Console.WriteLine($"Encoded: {text}");
+                    Console.WriteLine();
+                    Console.WriteLine($"Decoded: {decoded}");
+                }
+                
+                Console.WriteLine();
+                ShowSuccess("Base64 operation completed");
+            }
+            catch (Exception ex)
+            {
+                ShowError($"Base64 error: {ex.Message}");
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/UserSystem.cs b/UserSystem.cs
index 91b8df3..88c3e3e 100644
--- a/UserSystem.cs
+++ b/UserSystem.cs
@@ -159,6 +159,18 @@ namespace CMLeonOS
             }
         }
 
+        public string CurrentUsername
+        {
+            get
+            {
+                if (currentLoggedInUser != null)
+                {
+                    return currentLoggedInUser.Username;
+                }
+                return "Not logged in";
+            }
+        }
+
         public void FirstTimeSetup()
         {
             Console.WriteLine("====================================");