# Key

The `Xmf\Key` namespace contains classes to simplify working with keys. One use of these keys is in signing and verifying [JSON Web Token](https://xoops.gitbook.io/xmf-cookbook/reference/jwt).

## Classes in the Xmf\Key namespace

* [ArrayStorage](https://xoops.gitbook.io/xmf-cookbook/reference/key/arraystorage)
* [Basic](https://xoops.gitbook.io/xmf-cookbook/reference/key/basic)
* [FileStorage](https://xoops.gitbook.io/xmf-cookbook/reference/key/filestorage)
* [KeyAbstract](https://xoops.gitbook.io/xmf-cookbook/reference/key/keyabstract)
* [StorageInterface](https://xoops.gitbook.io/xmf-cookbook/reference/key/storageinterface)