Questions tagged [smime]

S/MIME is a standard for public key encryption and signing of MIME data. S/MIME is on an IETF standards track and defined in a number of documents, most importantly RFCs.

Filter by
Sorted by
Tagged with
3
votes
2answers
40 views

How to see certificate for intermediate CA in Keychain?

When I check details of a certificate I only see information about the certificate itself. Is there any way to see the issuer’s certificate? In my case it’s an intermediate CA. The certificate that I ...
5
votes
1answer
5k views

Apple Mail warning: Unable to verify message signature

After upgrading from Sierra to Mojave (macOS 10.14), Apple mail started to display the warning Unable to verify message signature above all signed and encrypted emails. When clicking on Details, it ...
0
votes
0answers
284 views

SMIME not working anymore on iOS 11+

Since updating to iOS 11 and renewing my SMIME certificates they've stopped working for encryption. Please see (Dutch) screenshots for the valid certificates and the grayed out options to choose "...
1
vote
1answer
280 views

How to store and retrieve S/MIME certificates in Open Directory (LDAP) of macOS Server?

Is it possible to use the Open Directory of the macOS Server app to store and retrieve S/MIME (X.509) certificates with the user data? Background: I would like to share our public S/MIME ...
0
votes
1answer
70 views

security cms for S/MIME?

Can I use security cms for encrypting and decrypting S/MIME mails? Or is there any alternative?
2
votes
3answers
1k views

Re-added certificate leads to unknown authority

Messing around with Keychain Access on macOS Sierra, it seems like I have accidentally deleted trusted root certificates in Keychain Access. What I did was opening a *.p7s file to add a S/MIME ...
0
votes
1answer
1k views

How to digitally sign a PDF with a X.509 certificate

I'm looking for a tool to digitally sign PDFs with the private key of my X.509 certificate. macOS' Preview app only copy a scan of my handwritten signature into a pdf...
2
votes
1answer
1k views

How to install S/MIME certificate on iOS 10.2

I tried to create my own S/MIME certificate with the help of this code: openssl genrsa -des3 -out ca.key 4096 openssl req -new -x509 -days 365 -key ca.key -out ca.crt openssl genrsa -des3 -out smime....
1
vote
1answer
209 views

iOS using wrong public key to encrypt mail

I've recently updated most of my certificates as they've expired at similar times. It appears that iOS mail is encrypting mail to one of my recipients using their old certificate, as such they cannot ...
2
votes
2answers
1k views

Apple Mail doesn't show when a mail is encrypted (using S/MIME)

I have recently started using S/MIME since we got a certificate from our school and are advised to use it when possible. I am using El Capitan 10.11.4. The encryption and decryption process ITSELF ...
0
votes
1answer
183 views

Signed messages not appearing properly in Mail on 10.11

I do a lot of work with S/MIME and am very familiar with the standard and the software. Since upgrading to 10.11 (El Captain), S/MIME-signed and encrypted messages have not been appearing as such in ...
1
vote
1answer
169 views

Apple-Mail set S/MIME algorithm

Apple-Mail uses DES-EDE3-CBC and SHA1 for new S/MIME-messages. Nowadays, both algorithms are considered as VERY WEAK and probably crackable by security agencies ore even large botnets. Is it somehow ...
3
votes
2answers
1k views

How can I see if an e-mail is signed in “Mail” (using an Exchange account)?

Usually, a signed message shows a checkmark icon. Clicking on this icon displays the certificate that was used to sign the message: Not so when a message lies in an exchange mailbox, and is displayed ...