Signierte E-Mails/en: Unterschied zwischen den Versionen

IMT HilfeWiki - das Wiki
(Eine dazwischenliegende Version desselben Benutzers wird nicht angezeigt)
Zeile 16: Zeile 16:
 
If you receive a '''signed e-mail''', you can rely both on the sender address displayed and on the fact that the content of the e-mail was not manipulated during transmission.
 
If you receive a '''signed e-mail''', you can rely both on the sender address displayed and on the fact that the content of the e-mail was not manipulated during transmission.
  
Therefore, pay attention to the sender address! It should '''not‘‘‘ say ''benutzerberatung@upb.de.hackerparadies.com'' or similar.
+
Therefore, pay attention to the sender address! It should '''not''' say ''benutzerberatung@upb.de.hackerparadies.com'' or anything similar.
  
 
The IMT sends e-mails under '''imt@uni-paderborn.de''' or '''imt@upb.de'''.
 
The IMT sends e-mails under '''imt@uni-paderborn.de''' or '''imt@upb.de'''.

Version vom 10. August 2022, 10:38 Uhr

Die deutsche Version finden Sie auf der Seite Signierte E-Mails

This tutorial provides information about the benefits and recognition of signed emails signed via the S/MIME procedure.

There is also the option to sign emails via the PGP procedure. For this method, users have to install additional plugin(s) and the public key of the respective sender has to be downloaded separately. In addition, the cryptographic key is not issued by a certification authority, but is generated privately.

Signed e-mails (S/MIME)[Bearbeiten | Quelltext bearbeiten]

What is a signed e-mail[Bearbeiten | Quelltext bearbeiten]

E-mail signatures are an additional protection instance to verify the sender address and the content of the message. This especially helps to unmask phishing e-mails posing as popular services (e.g., online banking, parcel services, e-mail providers, etc.). Phishing attempts are an increasingly frequent attack on user data and are sometimes more, sometimes less easily distinguishable from "real" e-mails. They are not based on malware, but on deceiving the recipient into believing that he or she has received a genuine request. More information about phishing including detailed examples can be found here: Notes on phishing emails

If you receive a signed e-mail, you can rely both on the sender address displayed and on the fact that the content of the e-mail was not manipulated during transmission.

Therefore, pay attention to the sender address! It should not say benutzerberatung@upb.de.hackerparadies.com or anything similar.

The IMT sends e-mails under imt@uni-paderborn.de or imt@upb.de.

Who can sign own e-mails (S/MIME)[Bearbeiten | Quelltext bearbeiten]

Anyone who has had their identity certified by the certification authority responsible for their e-mail address can sign e-mails. During this process, the e-mail address whose e-mails are to be signed in the future must be specified. The IMT (Center for Information and Media Technologies), for example, has the possibility to issue certificates for members of the University of Paderborn.

This includes all e-mail addresses of the following formats:

  • *@uni-paderborn.de
  • *@mail.uni-paderborn.de
  • *@campus.uni-paderborn.de
  • *@*.uni-paderborn.de
  • *@*.upb.de

More information about application: Applying for an e-mail SSL certificate

How to recognize signed e-mails?[Bearbeiten | Quelltext bearbeiten]

E-mail programs display correctly signed e-mails differently. Usually, a confirmation icon appears in the header of the message, as well as a reference to the sender.

Mobile devices (smartphones, tablets) are unfortunately an exception to the rule. The manufacturer, app used and version of the OS (Android/iOS) determine whether a notice appears or not. In our experience, most mail apps are currently unable to display the signing correctly. There are efforts by the operators to change this.

In popular desktop apps, as well as Webmail, signed emails are displayed as follows.

Outlook[Bearbeiten | Quelltext bearbeiten]

Outlook

Thunderbird[Bearbeiten | Quelltext bearbeiten]

Thunderbird

Apple mail[Bearbeiten | Quelltext bearbeiten]

Apple mail

Webmail[Bearbeiten | Quelltext bearbeiten]

Display in Roundcube Appearance in Horde

OWA[Bearbeiten | Quelltext bearbeiten]

Display in OWA (via Internet Explorer)

S/MIME signature and encryption[Bearbeiten | Quelltext bearbeiten]

Every signed e-mail also contains the sender's public cryptographic key. Common e-mail programs store this key with the corresponding contact in the address book. If you have the ability to sign your own e-mails, you can encrypt e-mails to the contact in question from this point on.

  • Signed e-mail = public key from sender
  • Public key + own S/MIME certificate = option to encrypt (to the contact)


Further information[Bearbeiten | Quelltext bearbeiten]


Bei Fragen oder Problemen wenden Sie sich bitte telefonisch oder per E-Mail an uns:

Tel. IT: +49 (5251) 60-5544 Tel. Medien: +49 (5251) 60-2821 E-Mail: imt@uni-paderborn.de

Das Notebook-Café ist die Benutzerberatung des IMT

Das IMT:Notebook-Café (Raum I0.401) bietet in der vorlesungsfreien Zeit nur eingeschränkten Support

Mo Di-Do Fr
Vor-Ort-Support - 09-13 Uhr -
Telefonsupport 08:30-13 Uhr & 13:30-15 Uhr 08:30-13 Uhr

Das IMT:Servicecenter Medien auf H1 hat aktuell von Montag bis Freitag von 08:00-13:00 Uhr geöffnet.


Cookies helfen uns bei der Bereitstellung des IMT HilfeWikis. Bei der Nutzung vom IMT HilfeWiki werden die in der Datenschutzerklärung beschriebenen Cookies gespeichert.