It appears that there is no official RFC for TLS 1.4 yet. Currently, TLS 1.3, which is documented in RFC 8446, is the latest version of the Transport Layer Security (TLS) protocol. TLS 1.3 introduced significant improvements over TLS 1.2, including reduced handshake time and enhanced security features.

For now, any references to future versions like TLS 1.4 remain speculative until formal work is proposed and published by the IETF. You can refer to RFC 8446 to explore the latest standards related to TLS.

For more details, you can review: - RFC 8446: https://www.rfc-editor.org/info/rfc8446 - Wikipedia on TLS: https://en.wikipedia.org/wiki/Transport_Layer_Security