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HTTPS is encrypted in order to increase security of data transfer. This is particularly important when users transmit sensitive data, such as by logging into a bank account, email service, or health insurance provider. Any website, especially those that require login credentials, should use HTTPS.
e. Hypertext Transfer Protocol Secure ( HTTPS) is an extension of the Hypertext Transfer Protocol (HTTP). It uses cryptography for secure communication over a computer network, and is widely used on the Internet.   In HTTPS, the communication protocol is encrypted using Transport Layer Security (TLS) or, formerly, Secure Sockets Layer (SSL). The protocol is therefore also referred to as HTTP over TLS,  or HTTP over SSL .
As a result, HTTPS is far more secure than HTTP. A website that uses HTTP has http:// in its URL, while a website that uses HTTPS has https://. What is HTTP? HTTP stands for Hypertext Transfer Protocol, and it is a protocol – or a prescribed order and syntax for presenting information – used for transferring data over a network. Most information that is sent over the Internet, including website content and API calls, uses the HTTP protocol.
HTTP/2 is a major new version of the HTTP protocol supported in all major web browsers. It adds compression, pipelining, and other features that help make web pages load faster. All web browsers require sites to use HTTPS encryption if they want these useful new HTTP/2 features. Modern devices have dedicated hardware to process the AES encryption HTTP requires, too.
Hypertext Transfer Protocol Secure (HTTPS) is a protocol that secures communication and data transfer between a user's web browser and a website. HTTPS is the secure version of HTTP. The protocol protects users against eavesdroppers and man-in-the-middle ( MitM) attacks. It also protects legitimate domains from domain name system (DNS) spoofing attacks.
Hypertext Transfer Protocol (HTTP) is the way servers and browsers talk to each other. It’s a great language for computers, but it’s not encrypted. Think of it this way. If everyone in the world spoke English, everyone would understand each other. Every browser and server in the world speaks HTTP, so if an attacker managed to hack in, he could read everything going on in the browser, including that Facebook username and password you just typed in.
An HTTP cookie (web cookie, browser cookie) is a small piece of data that a server sends to a user's web browser. The browser may store the cookie and send it back to the same server with later requests. Typically, an HTTP cookie is used to tell if two requests come from the same browser—keeping a user logged in, for example.
The HTTPS protocol does exactly two things: it encrypts the data transferred between you and the HTTPS website, and it validates that you are looking at the site you requested. It does not confirm that you requested the site you think you did, and it does not confirm that the site is legitimate. Scammers can use HTTPS.
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Secure Hypertext Transfer Protocol ( S-HTTP) is an obsolete alternative to the HTTPS protocol for encrypting web communications carried over the Internet. It was developed by Eric Rescorla and Allan M. Schiffman at EIT in 1994  and published in 1999 as RFC 2660 .