PAP (Password Authentication Protocol) sends username and password in clear text over the network, making it insecure. CHAP uses challenge-response with hash, MSCHAP is Microsoft variant with hash, EAP is extensible and can use various methods but not inherently clear text. Exact extract: It's "impossible" to authenticate wireless users based on EAP-PEAP sessions agains OpenLdap, except, if the users using clear text authetication methods (PAP). Clear text HTTP authentication is not secure. All user names and data (and, depending on the authentication style, passwords) are sent in clear text. If you ... Fortinet ... Password Authentication Protocol (PAP). Used to authenticate PPP connections. Transmits passwords and other user information in clear text. The default token page contains a "Token Code:" text field. Recommended customization. It's recommended to delete the "Token Code:" text. FortiWeb will use ... If you follow the configuration guide for NPS you'll see (step 9) you need to enable "Unencrypted authentication (PAP, SPAP)" (link below).