Stands for “Transport Layer Security.” TLS is an information encryption know-how that gives safe knowledge transfers. It encrypts (or scrambles) all knowledge despatched from one system to a different. Any third social gathering that makes an attempt to “eavesdrop” on the switch might be unable to acknowledge the info.

TLS can encrypt knowledge transfers over any network, from a small native space network to the Internet. Secure web sites, for instance, use TLS to ship web site content material over HTTPS. Email protocols, resembling IMAP and SMTP, additionally help TLS.

Secure protocols sometimes require a special port quantity than their non-secure counterparts. Below are the usual non-secure and safe (TLS) ports for net and e-mail connections:

  1. HTTP: port 80
  2. HTTPS: port 443
  3. IMAP (normal): port 143
  4. IMAP (safe): port 993
  5. SMTP (normal): port 25
  6. SMTP (safe): port 587


TLS is the successor to SSL, or Secure Sockets Layer. It was launched in 1999 as a safer technique of encrypting knowledge transfers. TLS 1.0 and 1.1 (launched in 2006) had been backward-compatible with SSL. While this simplified the transition course of, it additionally compromised safety, because it allowed methods to make use of the less-secure SSL choice.

In 2008, TLS 1.2 eradicated backward-compatibility with SSL. It additionally changed the MD5-SHA-1 encryption algorithm with stronger SHA-256 encryption. TLS 1.3, launched in 2018, added a number of extra safety enhancements.

Common net browsers, resembling Chrome, Safari, Edge, and Firefox, deprecated TLS 1.1 and earlier in 2018. Today, most net servers and mail servers require TLS 1.2 or 1.3.

NOTE: As of 2020, “SSL” remains to be an appropriate approach to seek advice from safe connections, even when they use TLS. For instance, many network and server admins say “SSL” when speaking about safe connections that use TLS. Additionally, safe certificates are nonetheless known as “SSL certificates,” regardless that most function over TLS.

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