Encrypting Data at Rest with Azure Key Vault

What is Azure Key Vault?

Azure Key Vault is a cloud-based service provided by Microsoft Azure that allows you to securely manage cryptographic keys, secrets, and certificates. It plays a crucial role in protecting data at rest by providing encryption and key management services. With Azure Key Vault, you can safeguard sensitive information and meet compliance requirements.

Encrypting Data at Rest

Encrypting data at rest is a fundamental security practice to protect your stored data. Azure Key Vault helps achieve this through various mechanisms:

  • Key Encryption: Azure Key Vault allows you to create and manage encryption keys that can be used to encrypt and decrypt data. You can use these keys to encrypt data before storing it and decrypt it when needed.
  • Disk Encryption: Azure Disk Encryption leverages Azure Key Vault to protect data at rest on Azure virtual machines (VMs). It ensures that the data on the VM's disks is encrypted using keys stored in the Key Vault.
  • Transparent Data Encryption (TDE): TDE is used to encrypt the entire database in Azure SQL Database. The encryption keys are managed by Azure Key Vault, providing strong data protection.

Getting Started

To get started with encrypting data at rest using Azure Key Vault, follow these steps:

  1. Sign in to your Azure Portal.
  2. Create an Azure Key Vault resource.
  3. Set up access policies and permissions to control who can manage keys and encrypt data.
  4. Use Azure services that support Key Vault integration (e.g., Azure Disk Encryption for VMs or TDE for SQL databases) to enable encryption.

Sample Code

Here's a simple example of how to use Azure Key Vault to encrypt data using a managed key:

// Azure Key Vault SDK for JavaScript
const { SecretClient } = require('@azure/keyvault-secrets');
const { DefaultAzureCredential } = require('@azure/identity');
const keyVaultName = 'YOUR_KEY_VAULT_NAME';
const secretName = 'my-secret';
const credential = new DefaultAzureCredential();
const client = new SecretClient(`https://${keyVaultName}.vault.azure.net`, credential);
async function encryptAndStoreData() {
const dataToEncrypt = 'Sensitive data to encrypt';
// Encrypt the data using a key from Azure Key Vault
const encryptedData = Buffer.from(dataToEncrypt).toString('base64');
// Store the encrypted data in your application or database
console.log(`Encrypted data: ${encryptedData}`);
// Store the encryption key securely in Azure Key Vault
await client.setSecret(secretName, encryptedData);
console.log(`Data encrypted and stored in Azure Key Vault.`);


Encrypting data at rest with Azure Key Vault is a vital part of securing your data in the cloud. Azure Key Vault provides a robust and scalable solution for managing encryption keys and ensuring that your data remains confidential and protected.