Virtual Stripper used to create spammer e-mail addresses
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Spammers have created a Windows game which shows a woman in a state of undress when people correctly type in text shown in an accompanying image. The scrambled text images come from sites which use them to stop computers automatically signing up for accounts that can be put to illegal use. [^] what will they think of next??? :doh: Steve
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Russell Jones wrote:
In the end i designed my own CATCHPA using html rather than an image
That sounds clever, and definitely worth an article.
Software Zen:
delete this;It sounds a lot more impressive than it really is. The most difficult thing was working out where to put the code in a page of php. Does CP accept articles on php anyway? The importnat thing with CATCHPA is to get a step ahead of the rest, the simplest test will work if you are the first person to use it. Equally if your site is not pulling monster traffic figures it's unlikely that a human is going to waste their time designing a system to break your CATCHPA. even text such as "which or these is not a primary colour red, green, purple" will work, especially as the usual formula for CATCHPA is an image tag with stuff in it next to a button. Russell
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that's a new one. I didn't understand how pr0n spambots were managing to sign up for my phpBB board despite me using various different CATCHPA image sets. It turns out that what they do is instantly display your image as a fake CATCHPA on a free porn sign up page. They may or may not get a response within the timeout of your image and it may or may not be correct but if you are offering free porn you get so many people trying to sign up that eventually you'll get an account. In the end i designed my own CATCHPA using html rather than an image so that you couldn't just copy it over to another site as a bot wouldn't know where CATCHPA finished and page began. Things like using divs with single letter in each and various layout classes so that a garbled section of html formed a question when rendered. I suspect that just by not having an off the shelf CATCHPA 99% of attacks will be blocked as it's not worth the spammers while building a system to break into your 1 off forum. Russ
Three words; Asian child labour.
regards, Paul Watson Ireland & South Africa
Andy Brummer wrote:
Watson's law: As an online discussion of cars grows longer, the probability of a comparison involving the Bugatti Veyron approaches one.
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Three words; Asian child labour.
regards, Paul Watson Ireland & South Africa
Andy Brummer wrote:
Watson's law: As an online discussion of cars grows longer, the probability of a comparison involving the Bugatti Veyron approaches one.
of course any CATCHPA breaking system that actually uses a human is going to out fox even the best CATCHPA algorithm
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of course any CATCHPA breaking system that actually uses a human is going to out fox even the best CATCHPA algorithm
Sure, I'm just saying don't break your back trying to create the perfect CATCHPA system. Spend your time elsewhere and deal with the spam.
regards, Paul Watson Ireland & South Africa
Andy Brummer wrote:
Watson's law: As an online discussion of cars grows longer, the probability of a comparison involving the Bugatti Veyron approaches one.
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It sounds a lot more impressive than it really is. The most difficult thing was working out where to put the code in a page of php. Does CP accept articles on php anyway? The importnat thing with CATCHPA is to get a step ahead of the rest, the simplest test will work if you are the first person to use it. Equally if your site is not pulling monster traffic figures it's unlikely that a human is going to waste their time designing a system to break your CATCHPA. even text such as "which or these is not a primary colour red, green, purple" will work, especially as the usual formula for CATCHPA is an image tag with stuff in it next to a button. Russell
Russell Jones wrote:
which or these is not a primary colour red, green, purple
But, in your example there are two right answers. More importantly, people seemed to be so dumbed down these days, they might not know what is meant by a primary color. Ask-around - you'll be sadly surprised.
"The difference between genius and stupidity is that genius has its limits." - Albert Einstein
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that's a new one. I didn't understand how pr0n spambots were managing to sign up for my phpBB board despite me using various different CATCHPA image sets. It turns out that what they do is instantly display your image as a fake CATCHPA on a free porn sign up page. They may or may not get a response within the timeout of your image and it may or may not be correct but if you are offering free porn you get so many people trying to sign up that eventually you'll get an account. In the end i designed my own CATCHPA using html rather than an image so that you couldn't just copy it over to another site as a bot wouldn't know where CATCHPA finished and page began. Things like using divs with single letter in each and various layout classes so that a garbled section of html formed a question when rendered. I suspect that just by not having an off the shelf CATCHPA 99% of attacks will be blocked as it's not worth the spammers while building a system to break into your 1 off forum. Russ
An even easier way is to use an aspx/php/(insert engine here) page to feed the image and store the relative index in a session variable. That way, the spammers don't know which image was sent through and have no frame of reference for the response, but the session variable keeps that frame of reference for your site. I feed images and audio up all the time using an aspx page that sets the response to the appropriate stream type for the content it is streaming from the database.
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It sounds a lot more impressive than it really is. The most difficult thing was working out where to put the code in a page of php. Does CP accept articles on php anyway? The importnat thing with CATCHPA is to get a step ahead of the rest, the simplest test will work if you are the first person to use it. Equally if your site is not pulling monster traffic figures it's unlikely that a human is going to waste their time designing a system to break your CATCHPA. even text such as "which or these is not a primary colour red, green, purple" will work, especially as the usual formula for CATCHPA is an image tag with stuff in it next to a button. Russell
Ummm.... Only Red is the primary color. BOTH Green and Purple are secondaries in the real world. It may be an RGB computer world, but Red, Blue, and Yellow are the primaries, with Green, Purple, and Orange being the secondaries. In other words, your question is invalid.
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An even easier way is to use an aspx/php/(insert engine here) page to feed the image and store the relative index in a session variable. That way, the spammers don't know which image was sent through and have no frame of reference for the response, but the session variable keeps that frame of reference for your site. I feed images and audio up all the time using an aspx page that sets the response to the appropriate stream type for the content it is streaming from the database.
That DOES sound worth an article.
David --------- Empirical studies indicate that 20% of the people drink 80% of the beer. With C++ developers, the rule is that 80% of the developers understand at most 20% of the language. It is not the same 20% for different people, so don't count on them to understand each other's code. http://yosefk.com/c++fqa/picture.html#fqa-6.6 ---------
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Ummm.... Only Red is the primary color. BOTH Green and Purple are secondaries in the real world. It may be an RGB computer world, but Red, Blue, and Yellow are the primaries, with Green, Purple, and Orange being the secondaries. In other words, your question is invalid.
Draugnar wrote:
Ummm.... Only Red is the primary color.
[Pedantic] Red, Green, and Blue are the primary colors. Red, Blue, and Yellow are *a* set of primary pigments (better quality printers use 4 or more pigments for superior color balance). The difference is that the former are emmissive and add up to white, the latter absorptive and add up to black. Your average art teacher wouldn't know the difference unless clubbed upside the head (institutional memory trumps truth), and since most students are required to take Art in school while Physics is an elective... [/Pedantic]
-- If you view money as inherently evil, I view it as my duty to assist in making you more virtuous.
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Draugnar wrote:
Ummm.... Only Red is the primary color.
[Pedantic] Red, Green, and Blue are the primary colors. Red, Blue, and Yellow are *a* set of primary pigments (better quality printers use 4 or more pigments for superior color balance). The difference is that the former are emmissive and add up to white, the latter absorptive and add up to black. Your average art teacher wouldn't know the difference unless clubbed upside the head (institutional memory trumps truth), and since most students are required to take Art in school while Physics is an elective... [/Pedantic]
-- If you view money as inherently evil, I view it as my duty to assist in making you more virtuous.
Well, I guess that shows how much I know. I always thought it was Red, Yellow, Blue as colors and the computer world just managed to make RGB for video emissions and CMY for pigments, but I guess I stand corrected. Thank you for the education. And I do mean it, I appreciate when I learn something new.
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That DOES sound worth an article.
David --------- Empirical studies indicate that 20% of the people drink 80% of the beer. With C++ developers, the rule is that 80% of the developers understand at most 20% of the language. It is not the same 20% for different people, so don't count on them to understand each other's code. http://yosefk.com/c++fqa/picture.html#fqa-6.6 ---------
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Draugnar wrote:
Ummm.... Only Red is the primary color.
[Pedantic] Red, Green, and Blue are the primary colors. Red, Blue, and Yellow are *a* set of primary pigments (better quality printers use 4 or more pigments for superior color balance). The difference is that the former are emmissive and add up to white, the latter absorptive and add up to black. Your average art teacher wouldn't know the difference unless clubbed upside the head (institutional memory trumps truth), and since most students are required to take Art in school while Physics is an elective... [/Pedantic]
-- If you view money as inherently evil, I view it as my duty to assist in making you more virtuous.
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Draugnar wrote:
Ummm.... Only Red is the primary color.
[Pedantic] Red, Green, and Blue are the primary colors. Red, Blue, and Yellow are *a* set of primary pigments (better quality printers use 4 or more pigments for superior color balance). The difference is that the former are emmissive and add up to white, the latter absorptive and add up to black. Your average art teacher wouldn't know the difference unless clubbed upside the head (institutional memory trumps truth), and since most students are required to take Art in school while Physics is an elective... [/Pedantic]
-- If you view money as inherently evil, I view it as my duty to assist in making you more virtuous.
Enough with this "primary colors" thing... (Yes, I know, I chimed in that only one was a primary color). The following article from Wikipedia makes it clear that there are no fixed primary colors in and of themselves. Primaries are, instead, relative to each other and are about the combining effects upon the human eye. From: http://en.wikipedia.org/wiki/Primary_color[^] ------------------------------------------------------ Primary colors are sets of colors that can be combined to make a useful range (gamut) of colors. For human applications, three are often used; for additive combination of colors, as in overlapping projected lights or in CRT displays, the primary colors normally used are red, green, and blue.[1] For subtractive combination of colors, as in mixing of pigments or dyes, such as in printing, the primaries normally used are magenta, cyan, and yellow.[2] Any choice of primary colors is essentially arbitrary; for example, an early color photographic process, autochrome, typically used orange, green, and violet primaries.[3] Primary colors are not a fundamental property of light but are often related to the physiological response of the eye to light. Fundamentally, light is a continuous spectrum of the wavelengths that can be detected by the human eye, an infinite-dimensional stimulus space.[4] However, the human eye normally contains only three types of color receptors called cone cells. Each color receptor responds to different ranges of the color spectrum. Humans and other species with three such types of color receptors are known as trichromats. These species respond to the light stimulus via a three-dimensional sensation, which can generally be modeled as a mixture of three primary colors.[4] Species with different numbers of receptor cell types would have color vision requiring a different number of primaries. For example, for species known as tetrachromats, with four different color receptors, one would use four primary colors. Since humans can only see to 400 nanometers (violet), but tetrachromats can see into the ultraviolet to about 300 nanometers, this fourth primary color might be located in the shorter-wavelength range. Many birds and marsupials are tetrachromats, and it has been suggested that some human females are tetrachromats as well[5][6], having an extra variant version of the long-wave (L) cone type.[7] The peak respo
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No not pedantic, just correct. Red, Blue and Yellow are the ONLY primary colours, green, purple and orange being secondary as stated.
Reading anything on colors in physics, we see that: cyan, magenta, yellow -- subtractive primary colors, subtract these from white to get any color red, green, blue -- additive primary colors, add these to black to get any color It's not really all that difficult... unless all you remember is kindergarten :laugh::laugh::laugh:
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Enough with this "primary colors" thing... (Yes, I know, I chimed in that only one was a primary color). The following article from Wikipedia makes it clear that there are no fixed primary colors in and of themselves. Primaries are, instead, relative to each other and are about the combining effects upon the human eye. From: http://en.wikipedia.org/wiki/Primary_color[^] ------------------------------------------------------ Primary colors are sets of colors that can be combined to make a useful range (gamut) of colors. For human applications, three are often used; for additive combination of colors, as in overlapping projected lights or in CRT displays, the primary colors normally used are red, green, and blue.[1] For subtractive combination of colors, as in mixing of pigments or dyes, such as in printing, the primaries normally used are magenta, cyan, and yellow.[2] Any choice of primary colors is essentially arbitrary; for example, an early color photographic process, autochrome, typically used orange, green, and violet primaries.[3] Primary colors are not a fundamental property of light but are often related to the physiological response of the eye to light. Fundamentally, light is a continuous spectrum of the wavelengths that can be detected by the human eye, an infinite-dimensional stimulus space.[4] However, the human eye normally contains only three types of color receptors called cone cells. Each color receptor responds to different ranges of the color spectrum. Humans and other species with three such types of color receptors are known as trichromats. These species respond to the light stimulus via a three-dimensional sensation, which can generally be modeled as a mixture of three primary colors.[4] Species with different numbers of receptor cell types would have color vision requiring a different number of primaries. For example, for species known as tetrachromats, with four different color receptors, one would use four primary colors. Since humans can only see to 400 nanometers (violet), but tetrachromats can see into the ultraviolet to about 300 nanometers, this fourth primary color might be located in the shorter-wavelength range. Many birds and marsupials are tetrachromats, and it has been suggested that some human females are tetrachromats as well[5][6], having an extra variant version of the long-wave (L) cone type.[7] The peak respo
Draugnar wrote:
Enough with this "primary colors" thing...
Indeed. Everyone knows that a primary colour is the first one you think of, so therefore has to be taken away!
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Reading anything on colors in physics, we see that: cyan, magenta, yellow -- subtractive primary colors, subtract these from white to get any color red, green, blue -- additive primary colors, add these to black to get any color It's not really all that difficult... unless all you remember is kindergarten :laugh::laugh::laugh:
Indeed, there are various color "systems"; most people only learn red/yellow/blue, yet don't seem to complain when they don't get purple when they mix red and blue.