# Protecting Asset Data

> **NOTE**
>
> The asset data mentioned in this topic refers to sensitive data less than 1024 bytes in size, including passwords, app tokens, and other critical data (such as bank card numbers).

## When to Use

Asset store service (ASSET) is used in the logins of the users who select **Remember password** on the login page. The application/browser stores the user passwords in an asset store, which ensures the password security.

When a user opens the login page again, the application/browser obtains the user password from the asset store and automatically fills the password in the **Password** text box. The user only needs to tap the **Log In** button to complete the login.

![](figures/asset-scenario.png)

## Development Process

The following figure illustrates the development process for the passwords (assets) protected.

![](figures/flowchat-no-auth-required.png)

1. The service queries an asset and determines whether the asset exists in the asset store based on the query result.

   For details about the development procedure, see [Querying Assets (ArkTS)](asset-js-query.md)/[Querying Assets (C/C++)](asset-native-query.md). For details about the sample code, see [Querying Attributes of an Asset (ArkTS)](asset-js-query.md#querying-attributes-of-an-asset)/[Querying Attributes of an Asset (C/C++)](asset-native-query.md#querying-attributes-of-an-asset).
2. If the asset does not exist, add an asset. For details, see [Adding an Asset (ArkTS)](asset-js-add.md)/[Adding an Asset (C/C++)](asset-native-add.md).
   
3. If the asset exists, the service can perform any of the following operations based on service requirements:
    * Remove the asset. For details, see [Removing Assets (ArkTS)](asset-js-remove.md)/[Removing Assets (C/C++)](asset-native-remove.md).
    * Update the asset. For details, see [Updating an Asset (ArkTS)](asset-js-update.md)/[Updating an Asset (C/C++)](asset-native-update.md).
    * Query the plaintext of the asset. For details, see [Querying Assets (ArkTS)](asset-js-query.md)/[Querying Assets (C/C++)](asset-native-query.md). For details about the sample code, see [Querying the Plaintext of an Asset (ArkTS)](asset-js-query.md#querying-the-plaintext-of-an-asset)/[Querying the Plaintext of an Asset (C/C++)](asset-native-query.md#querying-the-plaintext-of-an-asset).