# Backend security

More advanced backend security could also be achieved with `access_token` from hivesigner. You can make sure only user you want can access certain content, this way you don't have to add your own security layer just utilize what Hivesigner already provides you.

Below simple code makes sure that `access_token` is indeed signed by user. And checks to makes sure keys matches perfectly.

```
    const message = JSON.stringify({
                signed_message: signedMessage,
                authors: tokenObj.authors,
                timestamp: tokenObj.timestamp,
        })
    let hash = cryptoUtils.sha256(message)
    ...
    account[type].key_auths.forEach((key: string[]) => {
        if (
           !validSignature
           && PublicKey.fromString(key[0]).verify(hash, Signature.fromString(signature))
        ) {
              validSignature = true;
          }
    });
```

This combined with Imagehoster verification is perfect combination of security you can get in your app to serve user specific pages like drafts, bookmarks, images, etc.

###


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.hivesigner.com/h/use-cases/backend-security.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.