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03 November
2006 Secure
Computing Wages War Against Image
Spam Secure
Computing
Corporation
has announced it is waging war against image spam,
where spammers hide messages in image files to
escape detection. Over the past few months, Secure
Computing Research has identified a 200-percent
increase in the amount of image spam, which today
accounts for 30 percent of all spam and
approximately one in every four messages
circulating on the Internet. "Image-based spam
is a particularly difficult problem for a couple of
reasons," noted Michael Osterman, founder and
principal of Osterman Research. "It is much harder
to detect with conventional spam-filtering and
blocking technologies. Further, it is typically
much larger than normal text-based spam, consuming
much more bandwidth and storage." "Traditional
anti-spam software depends on content filtering
techniques such as keyword filtering and Bayesian
analysis to detect spam. Even the technology used
to recognize characters from images, Optical
Character Recognition (OCR), is not effective on
today's image spam," said Dr. Paul Judge, chief
technology officer of Secure Computing. "Spammers
are using advanced mathematical and graphical
techniques like random modification of image pixels
and dynamic construction of images from multiple
components to bypass spam filtering
tools." Insurance
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