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The Scourge of Image Spam |
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Source: CSOOnline - Posted by Benjamin D. Thomas
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E-mail solicitations that use graphical images of text to avoid filters are not new. Recently, however, they became more sophisticated and account for roughly 40 percent of spam today.
As spam filters evolve to detect new methods, the spammers job is to deliver something that the filter hasn’t yet learned is spam. Parsing an image can confound a filter because it sees only noise—millions of 0s and 1s in no discrete pattern.
To battle it, you must understand it. The graphic below demonstrates the various methods and how they work.
Read this full article at CSOOnline
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