How can I encrypt data stored in local storage?

How can I encrypt data stored in local storage?

You can use the Web Crypto API to encrypt data before storing it in local storage. Would you like a code example?

Yes, please provide a code example.

Here's a simple example using AES encryption:

async function encryptData(data) {
    const encoder = new TextEncoder();
    const key = await window.crypto.subtle.generateKey({
        name: 'AES-GCM',
        length: 256
    }, true, ['encrypt', 'decrypt']);
    const iv = window.crypto.getRandomValues(new Uint8Array(12));
    const encryptedData = await window.crypto.subtle.encrypt({
        name: 'AES-GCM',
        iv: iv
    }, key, encoder.encode(data));
    return { encryptedData, key, iv };
}

This function encrypts the data and returns the encrypted data along with the key and IV.

What should I do with the key and IV after encryption?

You should securely store the key and IV. The key is essential for decryption, so consider using a secure server or a key management service.

Can I use local storage to store the key?

It's not recommended to store the encryption key in local storage due to security risks. Instead, consider using a more secure method.