encrypted (TLS or SSL) connection instead of using a separate port for encrypted communication. Several protocols use a command named "STARTTLS" for this...

Another mechanism is to make a protocol-specific STARTTLS request to the server to switch the connection to TLS – for example, when using the mail and news...

The client may request the following operations: StartTLS – use the LDAPv3 Transport Layer Security (TLS) extension for a secure connection Bind – authenticate...

250-ENHANCEDSTATUSCODES S: 250 STARTTLS C: STARTTLS S: 220 Ready to start TLS ... TLS negotiation proceeds. Further commands protected by TLS layer ... C: EHLO client...

use. One of the most commonly used email encryption extensions is STARTTLS. It is a TLS (SSL) layer over the plaintext communication, allowing email servers...

upgrading to a TLS encrypted session is dependent on the connecting client deciding to exercise this option, hence the term opportunistic TLS. STARTTLS is effective...

Schinzel, Sebastian (August 13, 2021). Why TLS Is Better Without STARTTLS: A Security Analysis of STARTTLS in the Email Context (PDF). 30th USENIX Security...

Alternatively, a plain-text connection over port 119 may be changed to use TLS via the STARTTLS command. In October 2006, the IETF released RFC 3977, which updates...

Late 1998 this was revoked when STARTTLS was standardized. With STARTTLS, the same port can be used with or without TLS. The use of well-known ports for...

Mbed TLS (previously PolarSSL) is an implementation of the TLS and SSL protocols and the respective cryptographic algorithms and support code required...