Unfortunately, during 2002 a Maryland professor discovered some shortcomings [citation needed]. Over the next few years these shortcomings were addressed with the use of TLS and other enhancements.[27] This new version of EAP is now called Extended EAP and is available in several versions; these include: EAP-MD5, PEAPv0, PEAPv1, EAP-MSCHAPv2, LEAP, EAP-FAST, EAP-TLS, EAP-TTLS, MSCHAPv2, and EAP-SIM.