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PEAP Protected Extensible Authentication Protocol
Protected Extensible Authentication Protocol, Protected EAP, or simply PEAP (pronounced "peep"), is a method to securely transmit authentication information, including passwords, over wired or wireless networks. It was jointly developed by Cisco Systems, Microsoft, and RSA Security. Note that PEAP is not an encryption protocol; as with other EAP types it only authenticates a client into a network.

PEAP uses only server-side public key certificates to authenticate clients by creating an encrypted SSL/TLS tunnel between the client and the authentication server, which protects the ensuing exchange of authentication information from casual inspection.

PEAP is a joint proposal by Cisco Systems, Microsoft and RSA Security as an open standard. It is already widely available in products, and provides very good security. It is similar in design to EAP-TTLS, requiring only a server-side PKI certificate to create a secure TLS tunnel to protect user authentication.