Windows Time Server

3.2.6 Authentication Variables
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When the authentication mechanism suggested in Appendix C is used, the following state variables are defined in addition to the variables described previously. These variables are used only if the optional
authentication mechanism described in Appendix C is implemented.

Authentication Enabled Bit (peer.authenable): This is a bit indicating that the association is to operate in the authenticated mode.

Authenticated Bit (peer.authentic): This is a bit indicating that the last message received from the peer has been correctly authenticated.

Key Identifier (peer.hostkeyid, peer.peerkeyid, pkt.keyid): This is an integer identifying the cryptographic key used to generate the message-authentication code.

Cryptographic Keys (sys.key): This is a set of 64-bit DES keys. Each key is constructed as in the Berkeley Unix distributions, which consists of eight octets, where the seven low-order bits of each octet correspond to the DES bits 1-7 and the high-order bit corresponds to the DES odd-parity bit 8.

Crypto-Checksum (pkt.check): This is a crypto-checksum computed by the encryption procedure.

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