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Secure Hyper Text Transfer Protocol


Secure HTTP or S-HTTP is basically an extension to HTTP or Hypertext Transfer Protocol that permits secure files' exchange on the WWW (World Wide Web). Every S-HTTP file is encrypted, comprises a digital certificate. S-HTTP is a substitute to famous security protocol, namely Secure Sockets Layer or SSL. The S-HTTP permits clients to send the certificate in order to authenticate a user utilizing SSL, the only server could be authenticated. It is likely to be utilized in the situations where the server shows a bank, which needs authentication from the user, which is much secured than user id as well as password.
 
It does not utilize even a single encryption system, however, it supports Rivest-Shamir-Andleman or RSA public key infrastructure encryption system. It works at the program layer, which is marginally higher than TCP (Transmission Control Protocol) level. It works at a higher level of HTTP application. The security protocols could be utilized via browser user, however, only a one could be utilized with a particular document.  The Terisa systems contain S-HTTP and SSL in the toolkits of internet security. 

Numerous famous web server support SSL and S-HTTP. The new browsers support S-HTTP and SSL. The S-HTTP should submit to IETF (Internet Engineering Task Force) for the standard consideration. The RCFs (Request for Comments) Internet draft 2660 defines the S-HTTP. 

S-HTTP just encrypts submitted data such as POST fields and served page data, leaving protocol initiation unchanged. Due to this, the S-HTTP can be used simultaneously with HTTP on the same port as the unencrypted header will determine that the remaining transmission is encoded.
 
On the contrary, HTTP over the TLS wraps complete communication in the TLS or Transport Layer Security that is formerly known as SSL. Therefore, the encryption begins prior to the protocol data is sent. It makes name-based virtual hosting with decisive which DNS name was planned for the request. 

It means that the HTTPS implementations with no SNI (Server Name Indication) support needs separate IP each DNS name, as well as HTTPS implementations, need separate port (generally 443 vs. standard 80 of HTTP) for decided encryption use (treated in many browsers as separate URI scheme, HTTP://). 

In addition, HTTP could be secured via implementing HTTP/1.1 Upgrade headers as well as TLS up gradation.
 
Generally, in the Secure Hyper Text Transfer Protocol, the URL is not communicated in clear text headers; however, left blank and headers’ set is present in the encrypted payload. 


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