The Protected Extensible Authentication Protocol (PEAP) is an enhanced Extensible Authentication Protocol(EAP) developed by Cisco and Microsoft.
With the PEAP protocol, the connection is established via the TLS protocol, Transport Layer Security (TLS), before the EAP protocol is used for authentication. In this constellation, the identification data of the communication partners is protected.
Both authentication protocols, the EAP protocol and the PEAP protocol, are used for unsecured network access, for access via public networks and also in WLANs and for Remote Authentication Dial-In User Service( RADIUS). The PEAP protocol is being promoted as an Internet standard and is intended to replace the LEAP protocol developed by Cisco.