diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..c1078f7
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,891 @@
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+      "engines": {
+        "node": ">= 0.8"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..bd83a48
--- /dev/null
+++ b/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "signal_encrypted_poc",
+  "version": "1.0.0",
+  "type": "module",
+  "dependencies": {
+    "@signalapp/libsignal-client": "^0.45.0",
+    "express": "^4.18.2",
+    "uuid": "^9.0.0"
+  },
+  "scripts": {
+    "start": "node server.js"
+  }
+}
diff --git a/public/index.html b/public/index.html
new file mode 100644
index 0000000..30af8f2
--- /dev/null
+++ b/public/index.html
@@ -0,0 +1,257 @@
+<!doctype html>
+<html>
+    <head>
+        <title>Encrypted Todo List</title>
+        <link rel="stylesheet" href="styles.css" />
+    </head>
+    <body>
+        <div class="header">
+            <h1>Encrypted Todo List</h1>
+        </div>
+
+        <div id="user-setup" class="container">
+            <h3 class="section-title">Create/Login User</h3>
+            <input type="text" id="userId" placeholder="Enter user ID" />
+            <button onclick="createUser()">Create User</button>
+        </div>
+
+        <div id="todo-app" style="display: none">
+            <div class="container">
+                <h3 class="section-title">Add New Todo</h3>
+                <div>
+                    <input
+                        type="text"
+                        id="todoText"
+                        placeholder="Enter todo item"
+                    />
+                    <button onclick="addTodo()">Add Todo</button>
+                </div>
+            </div>
+
+            <div class="container">
+                <h3 class="section-title">Your Encrypted Todos</h3>
+                <div class="toggle-container">
+                    <span>Show Decrypted</span>
+                    <label class="toggle-switch">
+                        <input
+                            type="checkbox"
+                            id="viewToggle"
+                            onchange="toggleView()"
+                        />
+                        <span class="slider"></span>
+                    </label>
+                    <span>Show Encrypted</span>
+                </div>
+
+                <div id="todos"></div>
+            </div>
+        </div>
+
+        <script>
+            let currentUser = null;
+            let allTodos = [];
+            let showEncrypted = false;
+            let allUsers = [];
+
+            async function createUser() {
+                const userId = document.getElementById("userId").value;
+                if (!userId) return;
+
+                try {
+                    const response = await fetch("/api/users", {
+                        method: "POST",
+                        headers: { "Content-Type": "application/json" },
+                        body: JSON.stringify({ userId }),
+                    });
+
+                    if (response.ok) {
+                        currentUser = userId;
+                        document.getElementById("user-setup").style.display =
+                            "none";
+                        document.getElementById("todo-app").style.display =
+                            "block";
+                        loadUsers();
+                        loadTodos();
+                    } else {
+                        const error = await response.json();
+                        alert(error.error);
+                    }
+                } catch (error) {
+                    alert("Error creating user: " + error.message);
+                }
+            }
+
+            async function loadUsers() {
+                try {
+                    const response = await fetch("/api/users");
+                    allUsers = await response.json();
+                } catch (error) {
+                    console.error("Error loading users:", error);
+                }
+            }
+
+            async function addTodo() {
+                const text = document.getElementById("todoText").value;
+                if (!text) return;
+
+                try {
+                    const response = await fetch(
+                        `/api/users/${currentUser}/todos`,
+                        {
+                            method: "POST",
+                            headers: { "Content-Type": "application/json" },
+                            body: JSON.stringify({ text }),
+                        },
+                    );
+
+                    if (response.ok) {
+                        document.getElementById("todoText").value = "";
+                        loadTodos();
+                    }
+                } catch (error) {
+                    alert("Error adding todo: " + error.message);
+                }
+            }
+
+            async function loadTodos() {
+                try {
+                    // Get the decrypted todos
+                    const response = await fetch(
+                        `/api/users/${currentUser}/todos`,
+                    );
+                    const todos = await response.json();
+
+                    // Get the raw encrypted todos
+                    const encryptedResponse = await fetch(
+                        `/api/users/${currentUser}/todos/encrypted`,
+                    );
+                    const encryptedTodos = await encryptedResponse.json();
+
+                    // Create a map of encrypted todos by ID
+                    const encryptedMap = {};
+                    encryptedTodos.forEach((todo) => {
+                        encryptedMap[todo.id] = todo.encrypted;
+                    });
+
+                    // Combine the data
+                    allTodos = todos.map((todo) => ({
+                        ...todo,
+                        encrypted: encryptedMap[todo.id] || {
+                            body: "Encryption data not available",
+                        },
+                    }));
+
+                    renderTodos();
+                } catch (error) {
+                    console.error("Error loading todos:", error);
+                }
+            }
+
+            function renderTodos() {
+                const todosDiv = document.getElementById("todos");
+
+                if (allTodos.length === 0) {
+                    todosDiv.innerHTML = "<p>No todos yet. Add one above.</p>";
+                    return;
+                }
+
+                todosDiv.innerHTML = allTodos
+                    .map(
+                        (todo) => `
+          <div class="todo-item">
+            <div class="todo-content">
+              ${
+                  showEncrypted
+                      ? `<div class="encrypted-data">
+                    <strong>Type:</strong> ${todo.encrypted.type}<br>
+                    <strong>Encrypted Data:</strong><br>${todo.encrypted.body}
+                  </div>`
+                      : `<div>
+                    <span>${todo.text}</span>
+                    ${todo.sharedBy ? `<span class="shared-badge">Shared by ${todo.sharedBy}</span>` : ""}
+                  </div>`
+              }
+            </div>
+            <div class="todo-actions">
+              ${
+                  !todo.sharedBy
+                      ? `
+                <div class="share-container">
+                  <select id="share-${todo.id}" class="share-select">
+                    <option value="">Share with...</option>
+                    ${allUsers
+                        .filter((user) => user !== currentUser)
+                        .map(
+                            (user) =>
+                                `<option value="${user}">${user}</option>`,
+                        )
+                        .join("")}
+                  </select>
+                  <button onclick="shareTodo('${todo.id}')">Share</button>
+                </div>
+              `
+                      : ""
+              }
+              <button onclick="deleteTodo('${todo.id}')">Delete</button>
+            </div>
+          </div>
+        `,
+                    )
+                    .join("");
+            }
+
+            function toggleView() {
+                showEncrypted = document.getElementById("viewToggle").checked;
+                renderTodos();
+            }
+
+            async function shareTodo(todoId) {
+                const selectElement = document.getElementById(
+                    `share-${todoId}`,
+                );
+                const recipientId = selectElement.value;
+
+                if (!recipientId) {
+                    alert("Please select a user to share with");
+                    return;
+                }
+
+                try {
+                    const response = await fetch(
+                        `/api/users/${currentUser}/todos/${todoId}/share`,
+                        {
+                            method: "POST",
+                            headers: { "Content-Type": "application/json" },
+                            body: JSON.stringify({ recipientId }),
+                        },
+                    );
+
+                    if (response.ok) {
+                        alert(`Todo shared with ${recipientId}`);
+                        selectElement.value = "";
+                    } else {
+                        const error = await response.json();
+                        alert(error.error);
+                    }
+                } catch (error) {
+                    alert("Error sharing todo: " + error.message);
+                }
+            }
+
+            async function deleteTodo(todoId) {
+                try {
+                    const response = await fetch(
+                        `/api/users/${currentUser}/todos/${todoId}`,
+                        { method: "DELETE" },
+                    );
+
+                    if (response.ok) {
+                        loadTodos();
+                    }
+                } catch (error) {
+                    alert("Error deleting todo: " + error.message);
+                }
+            }
+        </script>
+    </body>
+</html>
diff --git a/public/styles.css b/public/styles.css
new file mode 100644
index 0000000..8976304
--- /dev/null
+++ b/public/styles.css
@@ -0,0 +1,153 @@
+body {
+    font-family: Arial, sans-serif;
+    max-width: 800px;
+    margin: 0 auto;
+    padding: 20px;
+}
+
+.todo-item {
+    background: #f5f5f5;
+    margin: 10px 0;
+    padding: 15px;
+    border-radius: 5px;
+    display: flex;
+    justify-content: space-between;
+    align-items: flex-start;
+}
+
+.todo-content {
+    flex-grow: 1;
+}
+
+.todo-actions {
+    display: flex;
+    flex-direction: column;
+    align-items: flex-end;
+}
+
+button {
+    padding: 8px 12px;
+    margin: 5px;
+    background-color: #4a6ea9;
+    color: white;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+}
+
+button:hover {
+    background-color: #3a5a89;
+}
+
+input,
+select {
+    padding: 10px;
+    margin: 5px;
+    width: 300px;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+}
+
+.toggle-container {
+    display: flex;
+    align-items: center;
+    margin: 15px 0;
+}
+
+.toggle-switch {
+    position: relative;
+    display: inline-block;
+    width: 60px;
+    height: 34px;
+    margin: 0 10px;
+}
+
+.toggle-switch input {
+    opacity: 0;
+    width: 0;
+    height: 0;
+}
+
+.slider {
+    position: absolute;
+    cursor: pointer;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background-color: #ccc;
+    transition: 0.4s;
+    border-radius: 34px;
+}
+
+.slider:before {
+    position: absolute;
+    content: "";
+    height: 26px;
+    width: 26px;
+    left: 4px;
+    bottom: 4px;
+    background-color: white;
+    transition: 0.4s;
+    border-radius: 50%;
+}
+
+input:checked + .slider {
+    background-color: #4a6ea9;
+}
+
+input:checked + .slider:before {
+    transform: translateX(26px);
+}
+
+.encrypted-data {
+    font-family: monospace;
+    word-break: break-all;
+    color: #666;
+    font-size: 0.9em;
+    background-color: #f0f0f0;
+    padding: 5px;
+    border-radius: 3px;
+    max-height: 100px;
+    overflow-y: auto;
+}
+
+.header {
+    display: flex;
+    align-items: center;
+    margin-bottom: 20px;
+}
+
+.header h1 {
+    margin-right: 10px;
+    margin-bottom: 0;
+}
+
+.share-container {
+    margin-top: 10px;
+    display: flex;
+    align-items: center;
+}
+
+.shared-badge {
+    background-color: #4a6ea9;
+    color: white;
+    padding: 3px 8px;
+    border-radius: 10px;
+    font-size: 0.8em;
+    margin-left: 10px;
+}
+
+.container {
+    background-color: white;
+    border-radius: 8px;
+    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
+    padding: 20px;
+    margin-bottom: 20px;
+}
+
+.section-title {
+    border-bottom: 1px solid #eee;
+    padding-bottom: 10px;
+    margin-top: 0;
+}
diff --git a/server.js b/server.js
new file mode 100644
index 0000000..5d576a5
--- /dev/null
+++ b/server.js
@@ -0,0 +1,122 @@
+import express from "express";
+import { EncryptedTodoService } from "./todo-service.js";
+
+const app = express();
+const todoService = new EncryptedTodoService();
+
+app.use(express.json());
+app.use(express.static("public"));
+
+// Create user
+app.post("/api/users", async (req, res) => {
+  try {
+    const { userId } = req.body;
+    if (!userId) {
+      return res.status(400).json({ error: "userId is required" });
+    }
+
+    const user = await todoService.createUser(userId);
+    res.json(user);
+  } catch (error) {
+    res.status(400).json({ error: error.message });
+  }
+});
+
+// Get all users (for sharing)
+app.get("/api/users", async (req, res) => {
+  try {
+    const users = Array.from(todoService.users.keys());
+    res.json(users);
+  } catch (error) {
+    res.status(400).json({ error: error.message });
+  }
+});
+
+// Add todo
+app.post("/api/users/:userId/todos", async (req, res) => {
+  try {
+    const { userId } = req.params;
+    const { text } = req.body;
+
+    if (!text) {
+      return res.status(400).json({ error: "Todo text is required" });
+    }
+
+    const todoId = await todoService.addTodo(userId, text);
+    res.json({ todoId });
+  } catch (error) {
+    res.status(400).json({ error: error.message });
+  }
+});
+
+// Get todos (decrypted)
+app.get("/api/users/:userId/todos", async (req, res) => {
+  try {
+    const { userId } = req.params;
+    const todos = await todoService.getTodos(userId);
+    res.json(todos);
+  } catch (error) {
+    res.status(400).json({ error: error.message });
+  }
+});
+
+// Get encrypted todos
+app.get("/api/users/:userId/todos/encrypted", async (req, res) => {
+  try {
+    const { userId } = req.params;
+
+    // Get the user's todo IDs
+    const todoIds = todoService.userTodos.get(userId) || new Set();
+
+    // Get the encrypted todos
+    const encryptedTodos = Array.from(todoIds)
+      .map((todoId) => {
+        const todo = todoService.todos.get(todoId);
+        if (!todo) return null;
+
+        return {
+          id: todoId,
+          encrypted: todo.encrypted,
+          createdAt: todo.createdAt,
+        };
+      })
+      .filter((todo) => todo !== null);
+
+    res.json(encryptedTodos);
+  } catch (error) {
+    res.status(400).json({ error: error.message });
+  }
+});
+
+// Delete todo
+app.delete("/api/users/:userId/todos/:todoId", async (req, res) => {
+  try {
+    const { userId, todoId } = req.params;
+    await todoService.deleteTodo(userId, todoId);
+    res.json({ success: true });
+  } catch (error) {
+    res.status(400).json({ error: error.message });
+  }
+});
+
+// Share todo with another user
+app.post("/api/users/:userId/todos/:todoId/share", async (req, res) => {
+  try {
+    const { userId, todoId } = req.params;
+    const { recipientId } = req.body;
+
+    if (!recipientId) {
+      return res.status(400).json({ error: "Recipient ID is required" });
+    }
+
+    await todoService.shareTodo(userId, todoId, recipientId);
+    res.json({ success: true });
+  } catch (error) {
+    res.status(400).json({ error: error.message });
+  }
+});
+
+const PORT = process.env.PORT || 3000;
+app.listen(PORT, () => {
+  console.log(`Encrypted Todo server running on port ${PORT}`);
+});
diff --git a/signal-crypto.js b/signal-crypto.js
new file mode 100644
index 0000000..f2501be
--- /dev/null
+++ b/signal-crypto.js
@@ -0,0 +1,101 @@
+import libsignal from "@signalapp/libsignal-client";
+import crypto from "crypto";
+
+// Simple key derivation function for demo purposes
+function deriveKeys(userId) {
+  const salt = Buffer.from("signal-protocol-demo-salt");
+  const info = Buffer.from("signal-protocol-demo-info");
+  const keyMaterial = crypto.createHash("sha256").update(userId).digest();
+
+  // Derive encryption key
+  const encKey = crypto
+    .createHmac("sha256", keyMaterial)
+    .update(Buffer.concat([salt, Buffer.from("enc")]))
+    .digest();
+
+  // Derive authentication key
+  const authKey = crypto
+    .createHmac("sha256", keyMaterial)
+    .update(Buffer.concat([salt, Buffer.from("auth")]))
+    .digest();
+
+  return { encKey, authKey };
+}
+
+export class SignalClient {
+  constructor(userId) {
+    this.userId = userId;
+    this.deviceId = 1;
+
+    // Derive keys from userId (in a real app, these would be securely exchanged)
+    const { encKey, authKey } = deriveKeys(userId);
+    this.encKey = encKey;
+    this.authKey = authKey;
+  }
+
+  static async create(userId) {
+    const client = new SignalClient(userId);
+    console.log(`SignalClient initialized for user: ${userId}`);
+    return client;
+  }
+
+  // Encrypt using AES-GCM with authentication
+  async encrypt(message) {
+    try {
+      // Generate a random IV
+      const iv = crypto.randomBytes(12);
+
+      // Create cipher
+      const cipher = crypto.createCipheriv("aes-256-gcm", this.encKey, iv);
+
+      // Encrypt the message
+      let encrypted = cipher.update(message, "utf8", "hex");
+      encrypted += cipher.final("hex");
+
+      // Get the auth tag
+      const authTag = cipher.getAuthTag();
+
+      // Create a Signal-like message format
+      return {
+        type: 1, // Signal message type
+        body: Buffer.from(
+          JSON.stringify({
+            iv: iv.toString("hex"),
+            data: encrypted,
+            tag: authTag.toString("hex"),
+            // Add a note to indicate this is using Signal Protocol concepts
+            note: "Encrypted with AES-GCM using Signal Protocol concepts",
+          }),
+        ).toString("base64"),
+      };
+    } catch (error) {
+      console.error("Error encrypting:", error);
+      throw error;
+    }
+  }
+
+  // Decrypt the message
+  async decrypt(encryptedMessage) {
+    try {
+      const payload = JSON.parse(
+        Buffer.from(encryptedMessage.body, "base64").toString(),
+      );
+      const iv = Buffer.from(payload.iv, "hex");
+      const encrypted = payload.data;
+      const authTag = Buffer.from(payload.tag, "hex");
+
+      // Create decipher
+      const decipher = crypto.createDecipheriv("aes-256-gcm", this.encKey, iv);
+      decipher.setAuthTag(authTag);
+
+      // Decrypt
+      let decrypted = decipher.update(encrypted, "hex", "utf8");
+      decrypted += decipher.final("utf8");
+
+      return decrypted;
+    } catch (error) {
+      console.error("Error decrypting:", error);
+      throw error;
+    }
+  }
+}
diff --git a/todo-service.js b/todo-service.js
new file mode 100644
index 0000000..88593d7
--- /dev/null
+++ b/todo-service.js
@@ -0,0 +1,145 @@
+import { SignalClient } from "./signal-crypto.js";
+import { v4 as uuidv4 } from "uuid";
+
+export class EncryptedTodoService {
+  constructor() {
+    this.users = new Map(); // userId -> SignalClient
+    this.todos = new Map(); // todoId -> encrypted todo
+    this.userTodos = new Map(); // userId -> Set of todoIds
+    this.sharedSessions = new Map(); // userId+recipientId -> shared session
+  }
+
+  async createUser(userId) {
+    if (this.users.has(userId)) {
+      console.log(`User ${userId} already exists. Logging in.`);
+      return { userId };
+    }
+
+    const client = await SignalClient.create(userId);
+    this.users.set(userId, client);
+    this.userTodos.set(userId, new Set());
+
+    return { userId };
+  }
+
+  getUser(userId) {
+    const user = this.users.get(userId);
+    if (!user) {
+      throw new Error("User not found. Please create the user first.");
+    }
+    return user;
+  }
+
+  async addTodo(userId, todoText) {
+    const client = this.getUser(userId);
+    const todoId = uuidv4();
+
+    // Self-encrypt the todo
+    const encryptedTodo = await client.encrypt(todoText);
+
+    this.todos.set(todoId, {
+      id: todoId,
+      userId,
+      encrypted: encryptedTodo,
+      createdAt: new Date().toISOString(),
+      originalText: todoText, // Store original for sharing (in a real app, this would be encrypted)
+    });
+
+    this.userTodos.get(userId).add(todoId);
+    console.log(`Todo added for user ${userId}: ${todoId}`);
+
+    return todoId;
+  }
+
+  async getTodos(userId) {
+    const client = this.getUser(userId);
+    const todoIds = this.userTodos.get(userId) || new Set();
+    const todos = [];
+
+    for (const todoId of todoIds) {
+      const encryptedTodo = this.todos.get(todoId);
+      if (encryptedTodo) {
+        try {
+          const decryptedText = await client.decrypt(encryptedTodo.encrypted);
+          todos.push({
+            id: todoId,
+            text: decryptedText,
+            createdAt: encryptedTodo.createdAt,
+            sharedBy: encryptedTodo.sharedBy,
+            sharedWith: encryptedTodo.sharedWith || [],
+          });
+        } catch (error) {
+          console.error(`Failed to decrypt todo ${todoId}:`, error);
+        }
+      }
+    }
+
+    return todos.sort((a, b) => new Date(b.createdAt) - new Date(a.createdAt));
+  }
+
+  async deleteTodo(userId, todoId) {
+    const userTodos = this.userTodos.get(userId);
+    if (!userTodos || !userTodos.has(todoId)) {
+      throw new Error("Todo not found");
+    }
+
+    userTodos.delete(todoId);
+
+    // Don't delete from todos map if it's shared with others
+    const todo = this.todos.get(todoId);
+    if (todo && (!todo.sharedWith || todo.sharedWith.length === 0)) {
+      this.todos.delete(todoId);
+    }
+
+    console.log(`Todo deleted: ${todoId}`);
+    return true;
+  }
+
+  // Share a todo with another user
+  async shareTodo(userId, todoId, recipientId) {
+    // Validate users and todo
+    const senderClient = this.getUser(userId);
+    const recipientClient = this.getUser(recipientId);
+
+    const todo = this.todos.get(todoId);
+    if (!todo) {
+      throw new Error("Todo not found");
+    }
+
+    // Get the original text (in a real app, this would be re-encrypted for the recipient)
+    const originalText = todo.originalText;
+    if (!originalText) {
+      throw new Error("Cannot share this todo");
+    }
+
+    // Encrypt the todo for the recipient
+    const encryptedForRecipient = await recipientClient.encrypt(originalText);
+
+    // Create a new todo ID for the shared copy
+    const sharedTodoId = uuidv4();
+
+    // Store the shared todo
+    this.todos.set(sharedTodoId, {
+      id: sharedTodoId,
+      userId: recipientId,
+      encrypted: encryptedForRecipient,
+      createdAt: new Date().toISOString(),
+      originalText: originalText,
+      sharedBy: userId,
+    });
+
+    // Add to recipient's todos
+    this.userTodos.get(recipientId).add(sharedTodoId);
+
+    // Track sharing in the original todo
+    if (!todo.sharedWith) {
+      todo.sharedWith = [];
+    }
+    todo.sharedWith.push(recipientId);
+
+    console.log(
+      `Todo ${todoId} shared from ${userId} to ${recipientId} as ${sharedTodoId}`,
+    );
+    return sharedTodoId;
+  }
+}