CHAP English Challenge-Handshake Authentication Protocol CHAP English English English English English Challenge-Handshake Authentication Protocol English CHAP CHAP English CHAP English CHAP English English English CHAP English Challenge-Handshake Authentication Protocol (CHAP) English CHAP English CHAP English CHAP CHAP English CHAP CHAP English English English English CHAP English English CHAP English Challenge-Handshake Authentication Protocol CHAP CHAP Wikipedia article English English CHAP