I applied for a 2048-bit Comodo certificate for my icloud.com email address. The certificates were delivered in a *.p7s file. They are:
- External CA Root Certificate
- Comodo Certificate
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- USERFirst Certificate
- Certificate for my icloud.com email address
For a more complete background about the history and architecture of S/MIME in the context of email, see Understanding S/MIME. As an Exchange Online admin, you can enable S/MIME-based security for the mailboxes in your organization. Use the guidance in the topics linked here along with Exchange Online PowerShell to set up S/MIME. For Secure Email (S/MIME) certificate on Outlook on Mac OS X The installation is in three parts: 1) Importing S/MIME certificate to Keychain Access 2) Linking S/MIME certificate to your Outlook profile 3) Storing a contact's Secure Email certificate (S/MIME exchange) Part 1 of 3: Importing S/MIME certificate to Keychain Access.
I could imported them into my 'login' Keychain on Mac but cannot import them into the 'iCloud' Keychain.
I then exported the certificates one by one into *.cer files and emailed them to myself (@icloud.com) so that I could import them on my iPhone/iPad.
Now I got the certificates under Settings/General/Profiles on iPhone/iPad. Each of them is trusted on iOS.
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Message signing/encryption works on my Mac. However if I send myself a message (@icloud.com) encrypted, I cannot read it on my iOS. In the message body it always displays 'This message is encrypted. Install a profie containing your encryption identity to decrypt this message'.
iPhone 4S, iOS 7.0.4
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