diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/main_demo.py b/main_demo.py
index e69de29..2bc0c7d 100644
--- a/main_demo.py
+++ b/main_demo.py
@@ -0,0 +1,122 @@
+import sys
+import os
+
+# 确保可以导入 core 包
+sys.path.append(os.path.dirname(os.path.abspath(__file__)))
+
+from core.sp_trust_sharding import SentinelKeyEngine
+from core.sp_vault_aes import SentinelVault
+from core.sp_gateway_rsa import SentinelSystemProvider
+
+def main():
+    print("=== Sentinel 协议 Demo 数据流全景演示 ===\n")
+
+    # ---------------------------------------------------------
+    # 1. 密钥拆解流：身份的碎裂化 (Initialization)
+    # ---------------------------------------------------------
+    print("## 1. 密钥拆解流 (Initialization)")
+    key_engine = SentinelKeyEngine()
+    
+    # 1.1 生成助记词 (BIP-39)
+    master_words, entropy = key_engine.generate_vault_keys()
+    print(f"   [生成] 原始助记词: {master_words}")
+    
+    # 1.2 SSS 分片 (3-of-2)
+    shares = key_engine.split_to_shares(entropy)
+    share_a = shares[0] # Device (手机)
+    share_b = shares[1] # Cloud (云端)
+    share_c = shares[2] # Physical (传承卡)
+    
+    print(f"   [分片] Share A (Device)  : {share_a}")
+    print(f"   [分片] Share B (Cloud)   : {share_b}")
+    print(f"   [分片] Share C (Physical): {share_c}")
+    print("-" * 60)
+
+    # ---------------------------------------------------------
+    # 2. 用户内层加密流：建立私密金库 (Vault Layer)
+    # ---------------------------------------------------------
+    print("\n## 2. 用户内层加密流 (Vault Layer)")
+    user_data = "我的瑞士银行账号是：CH123456789，密码是：Sentinel2026"
+    print(f"   [输入] 用户隐私数据: {user_data}")
+    
+    vault = SentinelVault()
+    # 2.1 派生 AES 密钥
+    aes_key = vault.derive_key(master_words)
+    # 2.2 加密数据
+    ciphertext_1 = vault.encrypt_data(aes_key, user_data)
+    print(f"   [加密] 密文 1 (AES-GCM): {ciphertext_1.hex()[:40]}... (Total len: {len(ciphertext_1)})")
+    print("-" * 60)
+
+    # ---------------------------------------------------------
+    # 3. 系统外层加壳流：双重包封 (Gateway Layer)
+    # ---------------------------------------------------------
+    print("\n## 3. 系统外层加壳流 (Gateway Layer)")
+    sys_provider = SentinelSystemProvider()
+    
+    # 3.1 生成系统级 RSA 密钥
+    sys_private_pem, sys_public_pem = sys_provider.generate_system_keys()
+    print("   [系统] 生成独立 RSA 公私钥对 (4096-bit)")
+    
+    # 3.2 使用系统公钥进行二次加密
+    ciphertext_2 = sys_provider.encrypt_with_system_public(sys_public_pem, ciphertext_1)
+    print(f"   [加密] 密文 2 (RSA-OAEP): {ciphertext_2.hex()[:40]}... (Total len: {len(ciphertext_2)})")
+    print("-" * 60)
+
+    # ---------------------------------------------------------
+    # 4. 判定触发流：剥离系统外壳 (Trigger/Unlock Layer)
+    # ---------------------------------------------------------
+    print("\n## 4. 判定触发流 (Trigger/Unlock Layer)")
+    print("   [事件] 模拟判定死亡或订阅失效，系统释放私钥权限...")
+    
+    # 4.1 系统私钥解密
+    try:
+        ciphertext_1_restored = sys_provider.decrypt_with_system_private(sys_private_pem, ciphertext_2)
+        print(f"   [解密] 还原回 密文 1: {ciphertext_1_restored.hex()[:40]}...")
+        
+        if ciphertext_1_restored == ciphertext_1:
+            print("   [验证] 密文 1 完整性校验通过 (Hash Match)")
+        else:
+            print("   [错误] 密文 1 校验失败")
+            return
+    except Exception as e:
+        print(f"   [错误] 系统解密失败: {e}")
+        return
+    print("-" * 60)
+
+    # ---------------------------------------------------------
+    # 5. 多场景还原流：最终提取 (Restoration Scenarios)
+    # ---------------------------------------------------------
+    print("\n## 5. 多场景还原流 (Restoration Scenarios)")
+
+    def run_scenario(scenario_name, share_1, share_2):
+        print(f"\n   >>> 场景: {scenario_name}")
+        print(f"       使用分片: {share_1[0]} 和 {share_2[0]}")
+        
+        # 5.1 恢复助记词
+        recovered_words = key_engine.recover_from_shares(share_1, share_2)
+        # print(f"       恢复助记词: {recovered_words}") 
+        
+        # 5.2 重新派生密钥
+        restored_key = vault.derive_key(recovered_words)
+        
+        # 5.3 解密数据
+        decrypted_text = vault.decrypt_data(restored_key, ciphertext_1_restored)
+        print(f"       解密结果: {decrypted_text}")
+        return decrypted_text
+
+    # 场景 1：生前正常访问
+    res1 = run_scenario("生前正常访问 (Device + Cloud)", share_a, share_b)
+    assert res1 == user_data
+
+    # 场景 2：死后标准传承
+    res2 = run_scenario("死后标准传承 (Cloud + Physical)", share_b, share_c)
+    assert res2 == user_data
+
+    # 场景 3：测试验证
+    res3 = run_scenario("测试验证 (Device + Physical)", share_a, share_c)
+    assert res3 == user_data
+
+    print("\n=== 演示结束: 所有流程验证通过 ===")
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file