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It would be nice to spread the trust around a bit, so we don't have to rely on just one root in any instance.
Is it possible to have a single certificate signed by more than one CA?
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You can have two certificates issued for the same domain and same server from different providers and it will cause no disruptions. This gives you time to install a new one and uninstall an older one without causing a lapse in security.
It depends on the CA and the certificate license. To install the same certificate on multiple servers, first install the certificate files to the server where the CSR was originally generated. Then import the files (along with the private key) to the respective servers.
It is possible to install two SSL certificates for one domain because of server name indication (SNI) technology.
There are over 100 different certificate authorities around the world that validate businesses and sites across the globe. Notably, imposters may still attempt to take advantage of certificates, so web users should still be familiar with site trust indicators, including site seals, to know if a website is secure.
No, the X509 certificate format up to version 3 is designed to contain exactly one signature.
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Yes, it is possible. You can find an example here:
http://www.confusedamused.com/notebook/fixing-verisign-certificates-on-windows-servers/
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