Li Su, Haiguang Wang, 2022-07-08, This document specifies the use of identity as a uncooked public critical in EAP-TLS, EAP-TLS for TLS1.2 is defined in RFC 5216 and EAP-TLS for TLS1.3 is described in the draft draft-ietf-emu-eap-tls13 and draft- ietf-tls-dtls13. The TLS id module (im) May be based on secure element it realizes some HKDF functions bound to PSK, and cryptographic signature if certificates are made use of.