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Posts Tagged ‘ssl vs tls’

What is TLS? Secure Email 101

Tuesday, November 27th, 2018

Transport Layer Security (TLS) is a widely used protocol in email security, the other being Secure Sockets Layer (SSL). Both are used to encrypt a communication channel between two computers over the internet.

An email client uses the Transport Control Protocol (TCP) – which enables two hosts to establish a connection and exchange data – via the transport layer to initiate a handshake with the email server before actual communication begins. The client tells the server the version of SSL or TLS it is running as well as the cipher suite (a set of algorithms that help in securing a network connection that uses SSL or TLS) it wants to use.

After this initial process, the email server verifies its identity to the client by sending a certificate the email client trusts. Once this trust is established, the client and server exchange a key, allowing messages exchanged between the two to be encrypted.

what is TLS

What parts of a message does TLS encrypt?

 The protocol encrypts the entire email message, including the header, body, attachments, email header, sender and receiver. TLS does not encrypt your IP address, server IP address, the domain you are connecting to, and the server port. The visible metadata informs where you are coming from, where you are connecting to and the service you’re connecting with, such as sending email or accessing a website. This article explains what is really protected by TLS and SSL.

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SSL versus TLS – What’s the difference?

Saturday, May 12th, 2018

SSL versus TLS

TLS (Transport Layer Security) and SSL (Secure Sockets Layer) are protocols that provide data encryption and authentication between applications and servers in scenarios where that data is being sent across an insecure network, such as checking your email (How does the Secure Socket Layer work?). The terms SSL and TLS are often used interchangeably or in conjunction with each other (TLS/SSL), but one is in fact the predecessor of the other — SSL 3.0 served as the basis for TLS 1.0 which, as a result, is sometimes referred to as SSL 3.1. With this said though, is there actually a practical difference between the two?

SSL versus TLS: What is the differenc?

See also our Infographic which summarizes these differences.

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