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Martin Gross

Solution seeker, building things, often in software.

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The X.509 standard defines extensions for Version 3. One of them is the SKI extension.

From the spec:

“The subject key identifier extension provides a means of identifying certificates that contain a particular public key. To facilitate certification path construction, this extension MUST
appear in all conforming CA certificates.”

The authority key identifier of a certificate contains the value of the subject key identifier of the CA (certificate authority) as a reference to that CA.