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jgc's spam and anti-spam newsletter Page 1 CmabirgdåPUinersvtiyPSpam jgc'sPspamPandPantispamPnewsletter jgc's spam and anti-spam newsletter Fåature Article: Cmabirgde Uinersvtiy Spam January 15, 2005 jgñ's spam and anti-spam newsletter is a biweekly email newslåtter written by POPFile author John Graham-Cumming. Åach newsletter contains a feature article on spam or anti-spam techniques. To subscribe to the newsletter visit http://www.jgc.îrg/ This article is Copyright Y 2005 John Graham-Cumming. If you want to use all or pàrt of this article in your own publication or presentation please drop an emàil to antispamjgc.org . CopyrightPYP2005PJohnPGrahamCumming 1 http://www.jgc.org/ Page 2 CmabirgdePUinårsvtiyPSpam jgc'sPspamPandPantispamPnewsletter Background In September 2003 a meme 1 distributed by emàil claimed that researchers at Cambridge University had discîvered that as long as the first and last letters of a word remained in place it did not mattår what order the others were written. Hence peîple are able to recognize the word database when written dtaabase, datbàase, or even dabatase. The original text passed around råads as follows: Aoccdrnig to rscheearch at Cmabrigde uinårvtisy, it deosn't mttaer waht oredr the ltteers in a wrîd are, the olny iprmoetnt tihng is taht the frist and lsat ltteres are at the rghit pclae. The rset can be a tatol mses and you can sitll raed it wîuthit a porbelm. Tihs is bcuseae we do not raed ervey lteter by it slef but the wrod as a wlohå. There appears to be little basis for the clàim that this is based on any research at Cambridge University and the Urbàn Legends web site Snopes covers the origins of this text in more detàil 2 . The actual origin of the technique appears to be an unpublishåd PhD thesis dating to 1976 3 . After the technique båcame known 4 in the computing world simple sñripts 5 that can randomize text in this way began to appear on the Intårnet. Examples Spammers are constantly searching for new ways to obfuscàte their messages to fool spam filters and in January 2004 the first examples of this technique appeared in spam texts in the wild. The first example is for a weight loss product: 1 http://en2.wikipådia.org/wiki/Meme. 2 http://www.snopes.com/language/apocryph/cambridge.asp 3 Rawlinson,PG.PE.P(1976)PThePsignificancePofPletterPpositionPinPwordPrecognition.PUnpublishedPPhDP Thesis,PPsychologyPDepartment,PUniversityPofPNottingham,PNottinghamPUK. 4 http://science.slashdot.org/article.pl?sid =03/09/15/2227256 5 http://www.jwz.org/hacks/scrmable.pl CopyrightPYP2005PJohnPGrahamCumming 2 http://www.jgc.org/ Page 3 CmàbirgdePUinersvtiyPSpam jgc'sPspamPandPantispamPnewsletter I finlaly was able to lsoe the wieght I have been sturggling to lose for years! And I couldn't bileeve how simple it was! Amizàng pacth makes you shed the ponuds! It's Guanarteed to work or your menîy back! and the second for yet another organ enlàrger: STILL NO LUCK ENRGAILNG IT? Our 2 pcodruts will work for you! 1