![]() ![]() A certificate will be rejected if the software does not recognize a “Critical Extenstion”. What does “This extension is critical” mean?Ī “Critical Extension” or “Criticality Indicator” is a flag that instructs software that uses the certificate where it is safe to ignore the Extended Key Usage Extension if it does not recognize it. This certificate must contain this but may contain this or that). This certificate must contain this EKU OID) whereas KUEs are generally checked defensively (ie. Generally EKUs are checked offensively (ie. KUEs is defined in terms of “operations whereas EKUs are defined in terms of “operations”. What’s the difference between KUE and EKU?Įxtended Key Usage extensions (EKUs) are newer and are generally used to restrict usage while the Key Usage Extensions (KUEs) are considered less flexible. If the EKU extension is omitted in a certificate, then all operations are potentially valid. EKUs are defined with Object Identifiers or OIDs. The Extended Key Usage extension or sometimes called the Enhanced Key Usage extensions (EKUs) are similar to the Key Usage Extensions (KUE), except that EKU values are defined in terms of “purpose” and be easily expanded upon. What is the Extended Key Usage extension? The different possibilities for the KUE are fixed and usually include a hexadecimal character that defines the combination of extensions used. KUEs values are defined in terms of “operation”. The Key Usage Extensions (KUEs) are characteristics placed into a certificate that define the actions available for that certificate.
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