Tuesday, June 26, 2012

DNS Changer Malware- its effects and how to secure your computer from this


DNSChanger Malware has been infecting computers from November last year.
The roughly half a million devices are still infected with DNSChanger.

Infected machines had their Domain Name System settings altered so websites would redirect to servers controlled by the criminals. The scammers reportedly earned millions in affiliate and referral fees by diverting users through those sites.

Computers affected with this Trojan will not be able to access Internet after 9th July.

If infected machines are not fixed by then, their Internet connections will go dark.
On Google, infected computers will see a warning atop their screen when completing a search (see below). 


Read more about this Malware and how to check whether your computer has been infected by this here in FBI’s Publication

Canvas vs. SVG


Canvas vs. SVG
With the advent of Canvas and SVG (scalable vector graphics), developers now have better choices for doing graphics on the Web than in the past.

Before Canvas, plug-ins such as Flash or Silverlight were the standard way to create animations on the Web. The alternative was to create a collection of good old-fashioned HTML, JavaScript and images, and bundle them into a collection of moving parts—a tedious task at best.

Two primary types of graphics are used on the Web:
·         Raster graphics are arrays of pixels arranged on a grid, also known as a bitmap. Common raster file extensions are .jpg, .bmp, .png, .tiff and .psd. Because Canvas uses pixels, it is raster based.
·         Vector graphics use mathematical metadata contained in a file to describe the graphic. The V in SVG stands for vector. Common vector file types are .svg, .eps and .xps.
Canvas and SVG have a few features in common. Both Canvas and SVG have an Open Source library ecosystem, and you never need plug-ins for either technology.

Side-by-side comparison of common Canvas and SVG characteristics.
Single DOM element
Multiple DOM elements
Script language
Markup language
Raster graphics
Vector graphics
No file format
.svg file format
Must reset canvas to change drawn shape
Can edit shapes after drawing
Not accessible
Doesn’t support event handlers
Supports event handlers
Non-searchable, can’t index
Searchable, can index
Can use hardware acceleration
No hardware acceleration

Canvas tends to be well suited for highly interactive games, especially when combined with Internet Explorer 9 GPU offloading.
Canvas is a great choice for image editing, and although you can’t edit , you can save the context state to allow the user to undo actions, essentially to do real-time editing.
SVG is great for graphic basics such as displaying a resolution-independent company logo that scales to any screen size without pixel distortion.
Fractals and Mandelbrot sets are just two types of complex data visualizations that are well suited for SVG.