> For the complete documentation index, see [llms.txt](https://docs.editran.onesait.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.editran.onesait.com/documentacion-editran/connect-v3.1-en/firma/administracionconnectfirma/canal/configuracion_canal_recepcion_con_firma.md).

# Input channel

If a *channel* is a receiving channel and has the signature feature enabled:

* The files received through it are signatures that are verified immediately and automatically after receipt.
* The signature files that are received must have the extension `.xsig` or `.p7b` so that Connect recognizes them as such and can apply the desired verification processing to them.
* Verification of each signature file is carried out on two levels: first, in relation to itself (structure, validity of the received certificates, integrity of the signed file, etc.) and second, in relation to the signing rules, or *file groups*, that apply to it. Whenever possible, the signed file is extracted during validation of the first level.
* The rules with which signatures are verified are defined through the *file groups* verify-purpose that are associated with the *channel*.
* Files are not configured from the menu **Contacts** and **Channels** but from the menu **File group**.
* In **Integration with applications -> Post-receipt process** should not be enabled **Move to directory** nor **Run program** when this implies moving the received files with extension `.xsig` or `.p7b`. This is because the verification process can only be triggered if the signature files are in the receiving directory.

The *file groups* verify-purpose, and that have already been configured for the *channel* receiving, are listed in **Address book -> Contact -> Channel (Edit) → Files**.

![List of the file groups of a signed receiving channel](https://1190478111-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FzO0mk2eo5LONjICfqrP8%2Fuploads%2Fgit-blob-8abf676ab85553d600219a02211951586bc3726f%2F03_listado_grupos_ficheros_canal_recepcion.png?alt=media)


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