He is described as the personification of a sophisticated challenge-handshake authentication protocol which guards the Oracle.

Challenge-handshake authentication protocol (CHAP)

In computing, the Challenge-Handshake Authentication Protocol (CHAP) authenticates a user or network host to an authenticating entity.

PPTP connections are authenticated with Microsoft Challenge-handshake authentication protocol or Extensible Authentication Protocol.

MS-CHAP is the Microsoft version of the Challenge-Handshake Authentication Protocol, CHAP.

RFC 1994 describes Challenge-handshake authentication protocol (CHAP), which is preferred for establishing dial-up connections with ISPs.

Access control and authentication: Using protocols like Challenge-handshake authentication protocol (CHAP) or Password authentication protocol (PAP) it has to provide and check authentication data.

PPP has supported EAP since EAP was created as an alternative to the Challenge-Handshake Authentication Protocol (CHAP) and the Password Authentication Protocol (PAP), which were eventually incorporated into EAP.