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3.3.5.6.4.3 Server Signature

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The KDC creates a keyed hash ([RFC4757]) of the entire PAC message with the Signature fields of both PAC_SIGNATURE_DATA structures set to zero using the server account key with the strongest cryptography that the domain supports<56> and populates the returned PAC_SIGNATURE_DATA structure ([MS-PAC] section 2.8) fields as follows:

  • The SignatureType is the value corresponding to the cryptographic system used to calculate the checksum.

  • The Signature field is the keyed hash of the entire PAC message with the Signature fields of both PAC_SIGNATURE_DATA structures set to zero.