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CER = DER | 38 comments | Create New Account
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Authored by: nicksay on Jan 27, '03 02:22:47PM

Just a note for some looking to do this...

My organization runs their own Certificate Authority (CA) and issues digital certificates, like the poster's situation above. These are used for intra-organization identity verification and secure network links, and the such.

However, downloading the necessary certificates from my organization results in .cer files, which didn't (intuitively) fit with the DER/PEM formats discussed above. A bit of research proved me wrong, though, and it seems that some CAs choose to use the "cer" extension when issuing certificates in the DER format. I followed the commands for DER formatted certificates (including that 'd' at the end), and everything worked as promised.

So, in summary, CER files are just DER files with a different extension and will work just fine.

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