How secure is the "Allow private key to be exported" setting in the certificate templates?

PKI administrators often assume that the option in the certificate template to not allow the private key for export is mandatory.

However, this is not the case. This is merely a default setting that the requester can change at any time when making the certificate request manually.

Furthermore, even a key generated as non-exportable is not safe from export. For this exist relevant toolsto export such certificates including keys.

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