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So this customer asked me to send me an encrypted Email. For that he sent the Email with his Digital Signature. I trusted the certificate that was contained and I also know I can get the public key from it that. But how can I send him an encrypted email (with attachment) using his public key in Outlook 2013?
tzippy
Posted 2017-05-24T07:29:09.313
Reputation: 404
Do you already have a certificate for your own? And consider looking at this: https://support.office.com/en-us/article/Encrypt-email-messages-373339cb-bf1a-4509-b296-802a39d801dc
– None – 2017-05-24T07:33:01.933No, actually I dont. When I try the method described in the link I get a message saying that
Microsoft Outlook cannot sign or encrypt this message because there are no certificates which can be used to send from the email address xx@yy.zz– tzippy – 2017-05-24T07:37:09.433This error tells you that you need a certificate for your email address. Do you want to encrypt using S/MIME? – None – 2017-05-24T07:44:22.407
Yes, I would prefer using S/MIME. – tzippy – 2017-05-24T07:46:33.373
So your customer has signed his e-mail using S/MIME aswell? – None – 2017-05-24T07:52:26.210
Exactly. S/MIME using SHA1 and RSA 2048. – tzippy – 2017-05-24T07:53:17.940
You cannot encrypt an email with your customers public key. You need your own private key – Ramhound – 2017-05-24T11:27:29.140