The Authority Key Identifier (AKI) extension provides a means to identify the public key of the CA that validates the signature on a CRL. This identification is based on either the subject key identifier (SKI) or the issuer name and serial number from the certificate that is issued by the CRL issuer. The AKI extension is useful in cases when a CRL issuer has more than one signing key.
Currently only the Thawte EV SSL certificate contains theAuthority Key Identifier (AKI) extension. To request an EV certificate please view our solution: SO4555