</ref><ref>Microsoft's PEAP version 0, [http://tools.ietf.org/html/draft-kamath-pppext-peapv0-00 draft-kamath-pppext-peapv0-00], §1.1</ref><ref name="peapv2-10_abstract">Protected EAP Protocol (PEAP) Version 2, [http://tools.ietf.org/html/draft-josefsson-pppext-eap-tls-eap-10 draft-josefsson-pppext-eap-tls-eap-10], abstract</ref><ref>Protected EAP Protocol (PEAP) Version 2, [http://tools.ietf.org/html/draft-josefsson-pppext-eap-tls-eap-10 draft-josefsson-pppext-eap-tls-eap-10], §1</ref> The purpose was to correct deficiencies in EAP; EAP assumed a protected communication channel, such as that provided by physical security, so facilities for protection of the EAP conversation were not provided.<ref>Protected EAP Protocol (PEAP) Version 2, [http://tools.ietf.org/html/draft-josefsson-pppext-eap-tls-eap-07 draft-josefsson-pppext-eap-tls-eap-07], §1</ref>
PEAP was jointly developed by [[Cisco Systems]], [[Microsoft]], and [[RSA Security]]. PEAPv0 was the version included with [[Microsoft]] [[Windows XP]] and was nominally defined in [http://tools.ietf.org/html/draft-kamath-pppext-peapv0-00 draft-kamath-pppext-peapv0-00]. PEAPv1 and PEAPv2 were defined in different versions of ''draft-josefsson-pppext-eap-tls-eap''. PEAPv1 was defined in [http://tools.ietf.org/html/draft-josefsson-pppext-eap-tls-eap-00 draft-josefsson-pppext-eap-tls-eap-00] through [http://tools.ietf.org/html/draft-josefsson-pppext-eap-tls-eap-05 draft-josefsson-pppext-eap-tls-eap-05],<ref>Protected EAP Protocol (PEAP), [http://tools.ietf.org/html/draft-josefsson-pppext-eap-tls-eap-05 draft-josefsson-pppext-eap-tls-eap-05], §2.3</ref> and PEAPv2 was defined in versions beginning with [http://tools.ietf.org/html/draft-josefsson-pppext-eap-tls-eap-06 draft-josefsson-pppext-eap-tls-eap-06].<ref>Protected EAP Protocol (PEAP), [http://tools.ietf.org/html/draft-josefsson-pppext-eap-tls-eap-06 draft-josefsson-pppext-eap-tls-eap-06], §2.3</ref>
The protocol only specifies chaining multiple EAP mechanisms and not any specific method.<ref name="peapv2-10_abstract"/><ref>Protected EAP Protocol (PEAP) Version 2, [http://tools.ietf.org/html/draft-josefsson-pppext-eap-tls-eap-10 draft-josefsson-pppext-eap-tls-eap-10], §2</ref> However, use of the [[EAP-MSCHAPv2]] and [[EAP-GTC]] methods are the most commonly supported.{{Citation needed|date=April 2010}}
