Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols designed to provide communication security over the Internet. They use X.509 certificates and hence asymmetric cryptography to authenticate the counterparty with whom they are communicating, and to exchange a symmetric key. This session key is then used to encrypt data flowing
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Twitter Bootstrap 3

The grid is responsive, mobile first, and percent-based. The CSS starts by assuming a mobile layout and then scales everything up. The basic template sets the viewport and enables the optional responsive javascript for IE8. Bootstrap Showcase Another cool website is Bootswatch Bootply Jetstrap Bootsnipp