Can an SSL certificate be signed by two issuers at the same time?

Let's take an intermediate certificate as an example.

It is usually signed by a root. A root certificate is often self-signed. In my understanding, if we take cross-signing, there are usually two or more certificate sets as we have several intermediate or root variations signed by different roots.

I have never seen a certificate signed by several issuers at the same time in practice. Is it possible?

P.S. I found the answer here: https://superuser.com/questions/477426/certificates-signed-by-multiple-cas



No, it's not possible for an X.509 certificate (the type used by OpenSSL) to have more than one signature.



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