# signing cert is not listed

**URL:** <https://community.ciphermail.com/t/signing-cert-is-not-listed/769>\
**Category:** Gateway\
**Created:** [March 23, 2022, 8:42am UTC](https://community.ciphermail.com/t/signing-cert-is-not-listed/769 "2022-03-23T08:42:19Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![cs-fh](https://avatars.discourse-cdn.com/v4/letter/c/49beb7/32.png) [@cs-fh](https://community.ciphermail.com/u/cs-fh)\
**Post date:** [March 23, 2022, 8:42am UTC](https://community.ciphermail.com/t/signing-cert-is-not-listed/769/1 "2022-03-23T08:42:19Z")

</div>

Hi,

i have a s/mime cert with key usage keyEncipherment and digitalSignature.  
I cannot sign with it and i do not know why.  
When i open the user preferences it is only shown in encryption certificates but not in signing certificates.  
Has anyone a idea what might be the problem here?  
Thanks for your help in advance.  
Here are a few screenshots:

Regards

Christian Schmid

[attachment.html](https://community.ciphermail.com/uploads/short-url/qpPYgKYTKrHzZMgeU9Hbl9p2D13.html) (2.17 KB)

![Bildschirmfoto2022-03-23um09.29.42.png](https://europe1.discourse-cdn.com/flex017/uploads/ciphermail/original/1X/89dce2307d73457bfbb61b852f0437de05025240.png)

![Bildschirmfoto2022-03-23um09.29.51.png](https://europe1.discourse-cdn.com/flex017/uploads/ciphermail/original/1X/c15a0a227aa1c5821976fddeedd72b92fd167be3.png)

![Bildschirmfoto2022-03-23um09.30.04.png](https://europe1.discourse-cdn.com/flex017/uploads/ciphermail/original/1X/37ef780cc6bfb638de06985207f8733f9839e1f0.png)

![Bildschirmfoto2022-03-23um09.30.19.png](https://europe1.discourse-cdn.com/flex017/uploads/ciphermail/original/1X/68e8d3e65051b59f1bcde1b8f8aa79c3ebbdb2bb.png)

---

<div class="post-metadata">

**Author:** ![martijn](https://dub1.discourse-cdn.com/flex017/user_avatar/community.ciphermail.com/martijn/32/127_2.png) [@martijn](https://community.ciphermail.com/u/martijn)\
**Post date:** [March 23, 2022, 8:52am UTC](https://community.ciphermail.com/t/signing-cert-is-not-listed/769/2 "2022-03-23T08:52:04Z")

</div>

> i have a s/mime cert with key usage keyEncipherment and  
> digitalSignature.  
> I cannot sign with it and i do not know why.  
> When i open the user preferences it is only shown in encryption  
> certificates but not in signing certificates.  
> Has anyone a idea what might be the problem here?

It looks like the certificate does not have an associated private key  
(otherwise a green lock symbol would have been shown on the certificate  
overview page).

If you want to digitally sign with a certificate, you need a cert with  
a private key.

Kind regards,

Martijn Brinkers

> **···**
>
> --  
> CipherMail email encryption  
> Email encryption with support for S/MIME,  
> OpenPGP, PDF Messenger and Webmail Messenger