iOS 7 has bug in handling attachments on S/MIME Encrypted Mail

Guys, I have a problem with the decryption of encrypted messages on my iPhone 5s with iOS 7.1.

I installed my private S/MIME certificate and I'm able to send signed messages. I'm also able to encrypt messages with my friend's public certificate.

When I now receive an enrypted message which was encrypted with my public certificate the mail.app shows an decryption error (sender's name in red with a question mark):

"Decryption Error. This message is encrypted. Install a profile containing your encryption identity to decrypt this message"

On my iMac I have no probs with decrypting this message. I really don't understand what's going on here.

Any hints?

Hi tdslman,

just to exclude it: did you check if at the end of the message you get the option to load the full message?

Best regards

Wolfgang

Hi Wolfgang,

there is no option to load the full message. Only the error message is shown. By the way: same problem on the iPad Air with iOS 7.1

Found something similar but still without a solution:

strange S/MIME behavior

Hi tdslman, did you ever resolve this problem? I have the same issue with my iPad. I had it in iOS7 and also in iOS8. But I only experience this when receiving emails from a Windows PC.

tdslman wrote:

Guys, I have a problem with the decryption of encrypted messages on my iPhone 5s with iOS 7.1.

I installed my private S/MIME certificate and I'm able to send signed messages. I'm also able to encrypt messages with my friend's public certificate.

When I now receive an enrypted message which was encrypted with my public certificate the mail.app shows an decryption error (sender's name in red with a question mark):

"Decryption Error. This message is encrypted. Install a profile containing your encryption identity to decrypt this message"

On my iMac I have no probs with decrypting this message. I really don't understand what's going on here.

Any hints?

an explanation and the solution to the above discussed problem can be found here.