How to encrypt with SSL/TLS

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SSL/TLS can be combined with protocols such as HTTP, which are used for communication with web servers, to achieve encrypted communication such as HTTPS. There are two main methods for encryption:



■ Start communication after SSL/TLS communication is established

In this case, since unencrypted plaintext communication cannot coexist with this protocol, a port number dedicated to encryption is required in addition to the port number used for medical mail list existing communication.



■ Switching to SSL/TLS communication midway

In this case, STARTTLS is used to issue the switching command (instruction), and this method itself is sometimes called STARTTLS.



What is STARTTLS?
"STARTTLS" is a mechanism that switches to encrypted communication using the Internet encryption technology "SSL/TLS", and is a technology that encrypts the communication path. When sending email, a protocol called "SMTP" is used to deliver the email.

With SMTP, the communication content is not encrypted and emails are sent in plain text, but by using "STARTTLS", the communication from the sending mail server to the receiving mail server is encrypted. This makes it possible to prevent the email body from being stolen, tampered with, or hacked during communication.

However, it is important to note that the condition is that the receiving mail server must support STARTTLS. If the receiving server supports STARTTLS, encrypted email can be sent, but if it does not, the email will be sent in plain text.