Editing Protected Extensible Authentication Protocol (section)

== PEAPv1 with EAP-GTC ==
PEAPv1/[[EAP-GTC]] was created by Cisco to provide interoperability with existing token card and directory based authentication systems via a protected channel.  Even though Microsoft co-invented the PEAP standard, Microsoft never added support for PEAPv1 in general, which means PEAPv1/EAP-GTC has no native [[Microsoft Windows|Windows]] OS support. Since Cisco has typically recommended lightweight EAP protocols such as [[Lightweight Extensible Authentication Protocol|LEAP]] and [[EAP-FAST]] protocols instead of PEAP, the latter has not been as widely adopted as some had hoped.

With no interest from Microsoft to support PEAPv1 and no promotion from Cisco, PEAPv1 authentication is rarely used.{{when|date=April 2010}}
Even in [[Windows 7]], released in late 2009, Microsoft has not added support for any other authentication system other than MSCHAPv2.

[[Nokia E66]] and later mobile phones ship with a version of [[Symbian]] which includes EAP-GTC support.

LDAP (Lightweight Directory Access Protocol) only supports EAP-GTC.{{citation needed|date=March 2017}}