> For the complete documentation index, see [llms.txt](https://docs.hivesigner.com/h/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hivesigner.com/h/use-cases/backend-security.md).

# 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.

###