Fortunately, from what I've read, CAPTCHA is about worthless if effectiveness counts. Frustrating for humans and not much of a barrier to the bots.
---------- Original Message ---------------------------------- From: "Colbeck, Andrew" <[EMAIL PROTECTED]> Reply-To: "Message Sniffer Community" <sniffer@sortmonster.com> Date: Wed, 11 Jun 2008 08:48:55 -0700 >... and it also means that OCR based spam filtering is succesful enough >for the spammers to adopt CAPTCHA-style text-obfuscation-in-images as an >evasion method. > > >Andrew. > > >-----Original Message----- >From: Message Sniffer Community [mailto:[EMAIL PROTECTED] On >Behalf Of Pete McNeil >Sent: Wednesday, June 11, 2008 8:18 AM >To: Message Sniffer Community >Subject: [sniffer] Re: Spam no using CAPTCHA! > > >Hello Daniel, > >Wednesday, June 11, 2008, 9:19:47 AM, you wrote: > >> Hi Everyone, > >> I just sent a spam sample to Message Sniffer, that was using CAPTCHA, >it >> said CIALIS in the CAPTCHA. I'm curios to see what Pete thinks of this >new >> tactic? > >On first look it is simply another way to use an obfuscated image to >deliver their message and should be handled the same way. Use of >CAPTCHA software to create this obfuscated image is an interesting >choice -- it means people making good OCR resistant CAPTCHA generators >are now unintentionally helping the blackhats defeat OCR based spam >filtering. > >_M > >-- >Pete McNeil >Chief Scientist, >Arm Research Labs, LLC. > > >############################################################# >This message is sent to you because you are subscribed to > the mailing list <sniffer@sortmonster.com>. >To unsubscribe, E-mail to: <[EMAIL PROTECTED]> >To switch to the DIGEST mode, E-mail to <[EMAIL PROTECTED]> >To switch to the INDEX mode, E-mail to <[EMAIL PROTECTED]> >Send administrative queries to <[EMAIL PROTECTED]> > > > >############################################################# >This message is sent to you because you are subscribed to > the mailing list <sniffer@sortmonster.com>. >To unsubscribe, E-mail to: <[EMAIL PROTECTED]> >To switch to the DIGEST mode, E-mail to <[EMAIL PROTECTED]> >To switch to the INDEX mode, E-mail to <[EMAIL PROTECTED]> >Send administrative queries to <[EMAIL PROTECTED]> > > ############################################################# This message is sent to you because you are subscribed to the mailing list <sniffer@sortmonster.com>. To unsubscribe, E-mail to: <[EMAIL PROTECTED]> To switch to the DIGEST mode, E-mail to <[EMAIL PROTECTED]> To switch to the INDEX mode, E-mail to <[EMAIL PROTECTED]> Send administrative queries to <[EMAIL PROTECTED]>
