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Using Azure Key Vault with Azure Functions

Atisha Shaurya
Atisha Shaurya
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Serverless computing has revolutionized the way we build and deploy applications. Azure Functions, Microsoft’s serverless compute service, allows developers to execute code in response to events without the need to manage infrastructure. However, handling sensitive information like connection strings, API keys, or encryption keys within serverless functions requires a secure and scalable solution. Azure Key Vault seamlessly integrates with Azure Functions to address these security concerns. In this blog post, we’ll explore how to leverage Azure Vault with Azure Functions for enhanced security and best practices.

Why Use Azure Key Vault with Azure Functions?

Azure Functions provide a convenient platform for building event-driven applications. However, handling secrets and keys within your functions code can be problematic for several reasons:

  1. Security: Storing sensitive information directly in code can expose it to potential attackers, especially when code is stored in version control systems.
  2. Scalability: As your application scales, managing secrets across multiple function instances can become cumbersome and error-prone.
  3. Rotation and Management: Regularly rotating keys and secrets is essential for security, and Azure Key Vault simplifies this process.
  4. Compliance: Many industries have compliance requirements regarding the secure management of secrets and keys.

Azure Key Vault addresses these concerns by providing a secure and centralized location for storing and managing cryptographic keys, secrets, and certificates.

Integrating Azure Key Vault with Azure Functions

Integrating Azure Key Vault with Azure Functions is a straightforward process. Here’s a step-by-step guide:

1. Create an Azure Key Vault

If you don’t have an Azure Key Vault already, create one in the Azure portal.

2. Add Secrets or Keys

Add the secrets, keys, or certificates you want to use within your Azure Functions to your Azure Vault.

3. Configure Managed Identity

Enable managed identity for your Azure Functions. This allows your functions to access resources securely without requiring explicit credentials.

4. Grant Access Policy

In the Azure Key Vault settings, create an access policy that grants the managed identity of your Azure Function the necessary permissions to access the secrets or keys.

5. Access Secrets in Your Function

In your Azure Function code, use the Azure SDK or libraries like the Azure Functions Key Vault extension to access the secrets from Key Vault. Your function can now securely retrieve secrets without exposing them in code.

6. Enable Key Rotation

Leverage Azure Key Vault’s key rotation capabilities to ensure that keys and secrets are regularly updated for enhanced security.

Best Practices

When using Azure Key Vault with Azure Functions, consider the following best practices:

  1. Least Privilege Access: Grant the minimum required permissions to the managed identity of your Azure Function in Azure Key Vault.
  2. Key Rotation: Implement a key rotation policy for secrets and keys stored in Azure Key Vault to enhance security.
  3. Logging and Auditing: Enable logging and auditing in Azure Key Vault to track access to secrets and keys.
  4. Secret Versioning: Take advantage of secret versioning to ensure you can revert to previous versions if needed.
  5. Monitoring: Implement monitoring and alerting to detect any unauthorized access or unusual activities related to your Azure Vault and Azure Functions.
  6. Secure Development: Follow secure coding practices to ensure that secrets retrieved from Azure Vault are handled securely within your Azure Functions code.


Azure Key Vault provides a robust solution for securing secrets and keys, while Azure Functions offer an event-driven, serverless compute platform. By integrating Azure Vault with Azure Functions, you can enhance the security, scalability, and manageability of your serverless applications. With proper configuration and adherence to best practices, you can confidently build and deploy secure serverless solutions on Azure.

Atisha Shaurya

Atisha Shaurya

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