Encrypting & Decrypting Images

Welcome to this guide on encrypting images using Xano, the no-code platform that simplifies backend development. In this article, we'll walk you through the process of securely storing and retrieving encrypted images in your Xano application. Whether you're a non-technical user, a citizen developer, a professional developer, or building an application for your startup or small business, this guide will provide you with the necessary steps to ensure the privacy and security of your image data.

Step 1: Creating a Secret Key

The first step in encrypting images is to create a secret key. This key will be used to encrypt and decrypt your image data. In Xano, you can create a secret key by following these steps:

1. Navigate to the "Security" section in the Xano interface.
2. Locate the "Create Secret Key" function and click on it.
3. Click the "Run" button to generate a new secret key.
4. Copy the generated secret key.

Step 2: Storing the Secret Key as an Environment Variable

To ensure the security of your secret key, it's essential to store it as an environment variable. This way, the key won't be exposed in your code or application. Follow these steps to store the secret key as an environment variable:

1. In the Xano interface, navigate to the "Environment Variables" section.
2. Create a new environment variable with a descriptive name, such as "encryption_key".
3. Paste the secret key you copied in Step 1 as the value for the "encryption_key" variable.
4. Click "Save" to store the environment variable securely.

Step 3: Encrypting the Image Metadata

Now that you have a secret key stored securely, you can proceed to encrypt the image metadata. Here's how you can do it:

1. In your Xano function that handles image uploads, create a new variable to store the encrypted metadata.
2. Use the `JWE_encode` function from the Xano security library to encrypt the image metadata.
3. Pass the following parameters to the `JWE_encode` function:

• The image metadata (obtained from the `create_image_from_file` function)
• The secret key (stored as the "encryption_key" environment variable)
• Optional: Algorithm and content algorithm (you can leave these as default)
• Optional: Time to live (you can leave this as default)

1. Store the encrypted metadata as a text field in your database.

Step 4: Decrypting the Image Metadata

When you need to retrieve and display an encrypted image, you'll need to decrypt the metadata first. Here's how you can do it:

1. In your Xano function that retrieves the image record, fetch the encrypted metadata from the database.
2. Use the `JWE_decode` function from the Xano security library to decrypt the metadata.
3. Pass the following parameters to the `JWE_decode` function:

• The encrypted metadata (fetched from the database)
• The secret key (stored as the "encryption_key" environment variable)

1. Store the decrypted metadata in a variable.

Step 5: Rendering the Image

After decrypting the image metadata, you can render the image by following these steps:

1. Combine the Xano domain (e.g., `https://your-app.xano.io`) with the decrypted image path to construct the full image URL.
2. Update the image record in your database with the constructed image URL.
3. Return the updated record in your Xano function's response.

By following this step-by-step guide, you'll be able to securely store and retrieve encrypted images in your Xano application. This approach ensures the privacy and security of your image data, making it accessible only to authorized parties.

Remember, Xano is designed to simplify backend development, allowing both technical and non-technical users to build and deploy applications quickly and efficiently. By leveraging Xano's security features and following best practices, you can create robust and secure applications that meet the needs of your business or project.