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Technical Terms and Abbreviations Glossary: H

HD Voice, HiFi, HSTS


HD Voice: Wideband audio better known as Adaptive Multi-Rate Wideband (AMR-WB) or HD Voice. HD Voice provides improved speech quality due to a wider speech bandwidth for phone calls via landline and 3G/4G mobile phones.

List of Mobile Phones using HD Voice (Wikipedia)


HiFi (abbr.): High Fidelity. Natural sound as possible on a high-end device e.g. entertainment cabinet, loudspeaker box, headphones, mobile phone or MP3 Player.


HSTS (abbr.): HTTP Strict Transport Security is a web security policy mechanism that helps to protect websites against protocol downgrade attacks and cookie hijacking. It allows web servers to declare that web browsers (or other complying user agents) should interact with it using only HTTPS connections, which provide Transport Layer Security (TLS/SSL), unlike the insecure HTTP used alone. HSTS is an IETF standards track protocol and is specified in RFC 6797.

The HSTS Policy is communicated by the server to the user agent via an HTTPS response header field named "Strict-Transport-Security". HSTS Policy specifies a period of time during which the user agent should only access the server in a secure fashion. Websites using HSTS often do not accept clear text HTTP, either by rejecting connections over HTTP or systematically redirecting users to HTTPS (though this is not required by the specification). The consequence of this is that a user-agent not capable of doing TLS will not be able to connect to the site.

This article is based on the article https://en.wikipedia.org/wiki/HSTS from the free encyclopedia Wikipedia and is licensed under the dual GNU lizenz for free documentation and Creative Commons CC-BY-SA 3.0 Unported (short version). A list of authors is available in Wikipedia.


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