# Private Key Management

Defi App integrates [**Turnkey**](https://github.com/tkhq) via Dynamic’s Account Abstraction infrastructure to provide secure, passkey-authenticated wallet management. 

Private keys are protected using **secure enclaves and AWS Nitro Enclaves**, ensuring high security without local storage.

## **Storage & Security Mechanism**

#### **Turnkey-Managed Private Keys via Secure Enclaves**

* **Passkeys replace traditional passwords** and are tied to a user's biometric authentication (TouchID, FaceID) or hardware security module. **Passkeys sync across devices** via keychains (iCloud, Google Password Manager, 1Password), allowing users to sign transactions securely from any device.
* **Private keys are never directly stored** on the user's device. Instead, they are protected using **secure enclaves** (e.g., iOS Secure Enclave, Android’s Trusted Execution Environment).
* Wallet objects and verified credentials include **Turnkey-specific metadata** for authentication:
  * `turnkeySubOrganizationId`
  * `turnkeyPrivateKeyId`
  * `turnkeyHDWalletId`
  * `turnkeyUserId`
* **Session Security Flags**:
  * `isAuthenticatorAttached`: Ensures wallet meets **biometric authentication security**.
  * `isSessionKeyCompatible`: Determines whether **session-based keys** can be used securely.

## Security & Compliance

### **Key Protection & Encryption**

Private keys are never stored in plaintext—they are encrypted and only decrypted inside tamper-proof secure enclaves. AWS Nitro Enclaves and Trusted Execution Environments (TEEs) ensure all cryptographic operations happen in isolated, auditable environments.

**No raw private key access** is needed at any point, reducing phishing and attack risks.

Passkeys replace passwords, using biometric authentication (FaceID, TouchID) or hardware security modules for frictionless, secure access.

### **Backup & Recovery**

* Passkeys sync across devices via keychain providers like iCloud, Google Password Manager, and 1Password, enabling seamless recovery.
* Encrypted private key ciphertext is stored in disaster recovery databases, ensuring fault tolerance without compromising security.

### **Regulatory & Security Standards**

* EIP-4361 (Sign-In with Ethereum) & BIP-32/39 compliance for wallet authentication and hierarchical deterministic wallets.
* Non-custodial architecture—only the end user can authorize key usage, reinforcing full user control over their funds.
* Turnkey follows industry-standard cryptographic practices, but explicit FIPS-140-2 certification is not publicly confirmed.


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