Sudoku may save us from spam

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	Sudoku may save us from spam

pokkets

11-18-2007 9:37 PM

740 views

tags:

spam, sudoku, puzzle, solve

pokkets says:

If the spam server is busy solving puzzles, it can have more trouble delivering spam.
The more suspect the Email, the harder the puzzle

2 Comments |

Add a Comment

11-20-2007 12:10 PM

n2teaching

Wow! Very sensible!

6-13-2009 12:29 PM

murieleileen

puzzles can be very useful

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/c2a83b1f-b513-46c9-95ae-3f4a6ee64179/2BBBC207-55AB-4036-A81E-1C4DBED23E2F/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech" href="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech" style="font-size: 11px;">www.abc.net.au</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech"> Stephen Pincock</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech"><P class="first">Tricky mathematical puzzles like Sudoku could be the next weapon in the fight against spam, an Australian computer scientist suggests.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.abc.net.au/img/EB4CAD2D-C141-4DDE-9464-34598E8B08AB" alt="sudoku" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech">aul Gardner-Stephen from <A target="_blank" href="http://www.flinders.edu.au/">Flinders University</A> in Adelaide is looking for ways to improve existing spam filters,</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech"><table background="undefined" bgcolor=""><tr><TD width="11%"> </TD></tr></table></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech"><P>If it looks suspect, the server would automatically respond to the sending server with a mathematical challenge to solve before the message is delivered.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech"><P>The more certain your spam filter is that the message is junk, the harder the puzzle would be to solve.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech">"If someone's trying to send spam, they end up with a lot of puzzles to solve, so they can only send relatively few messages a day,"</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2007/11/19/2094677.htm?site=science&topic=tech"><P>In technical terms, the system is known as a 'proof-of-work' scheme. 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