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I'm implementing a captcha system using this code: http://www.thomasmoore.it/webdesign/asp/captcha.asp
As you can see in that page there is an example of image with alphanumeric characters.
Below an example:
I would like to understand if that image is strong enough or not.
Do you know if there are scripts that can break it?
Thank you!
I don't know how answer your question but i suggest using controls that have been used and tested before..like recaptcha
I wouldn't use it, not because it's not safe, but because it's not accessible. What if your users use screenreaders? Stay with an accessible solution such as recaptcha and make your users happy ;)
As for the security, mine may be a controversial opinion, but I think it doesn't matter so much. Why? because if an attacker is serious about breaking your site, they can use the Mechanical Turk or one of the bazillion online services that offers to solve any captcha by hand for a really low price. Of course a good captcha is one more barrier for them to break, but don't trust them too much.
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Is it possible to scrape data automatically from websites that require a validation code each time a webpage is accessed? Such as the case when the website shows you a picture of the code and asks you to enter what is shown in the picture. I'm using the rvest package. Is this possible to do?
What you're trying to do is beat CAPTCHAs. That's possible but very hard. This is a spammer's hardest job - to come up with an algorithm smart enough to fill out those fields correctly. It's not something you're supposed to do, the whole point of those validation codes is to prevent access from non-humans. If you're smart and motivated enough to figure out how to answer those questions programatically, you can probably make more money doing that than whatever you're trying to do :)
Some websites offer a direct API, which is the way you're supposed to interact with their data. But getting past a CAPTCHA by scraping is not an easy deed.
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While trying to get friendly urls in WordPress I jumped into this http://wordpress.org/support/topic/duplicate-category-slugs-desperately-needed-will-this-ever-be-fixed
So the question is, how bad is from the SEO point of view to use something like this...
mysite.com/cars/1-honda
mysite.com/trucks/2-honda
mysite.com/motors/3-honda
No one can really answer your question, because Google doesn't publish much about how PageRank works, and for good reason.
That being said, I don't see why something like that would be a problem. It still incorporates the keywords you're trying to use into the URL, and the superfluous number isn't likely to detract from that; many websites put numbers in URLs for internal purposes. While it arguably distracts from the human aesthetics of the URL, I think you're worrying about nothing when it comes to SEO.
The numbers won't hurt you as far as SEO
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I am trying to use the Scott Allen's ChartBuilder class, but I can't find it anywhere, I tried googling and go through a guide, but it links to msdn page which doesn't exist anymore
Does anyone still have that class?
Short answer:
You can download the project here: http://dl.dropbox.com/u/13430676/Charting.zip
Long answer:
The download was lost during one of the dozen or so redesigns, reorganizations, and upgrades of the MSDN web site, team, and magazine staff. I've tried to let them know, and also tried to fix this myself. Unfortunately, fixing the link seems to require a GUID value which is unknown to me, and GUIDs turn out to be notoriously difficult to guess. I'll keep trying, but in the meantime I've put it up for download from my Dropbox account.
Hope that helps...
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I'm working on several ASP.NET ecommerce projects where we're using Aspdotnetstorefront solution. It is not so bad. It has a lot of useful features, it is extensible, it is stable, but... the source code is like nightmare. If you need customize something - it becomes a problem for you, because you need to change it in several places and always keep it in mind.
Can anyone suggest some better solution?
roll your own? there are several start up projects available from microsoft or i have heard that dotshoppingcart is supposed to be good but i have not used it myself. I would advise diy as then you will know what is happening in the code
http://www.asp.net/community/projects look for ecommerce
Your choice will probably depend on whether you want c# or vb, webforms or MVC etc.
If you want webforms like aspdotnetstorefront then try
Kartris (codeplex)
It's free and open source. Nopcommerce is popular if you want MVC
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Recently I've wanted to do a number of things using CSS only to find that the best solution is to use Javascript. This has made me wonder, does anyone here know how to go about making development suggestions to be implemented into CSS 3 spec?
It would be great if we could get some sort of feature request/vote based system going that the w3 guys could at least look at. I know, as a programmer, I often overlook obvious things when I'm deep into something.
You should probably subscribe to the www-style mailing list of W3C
This mailing list is for technical discussion on Cascading Style Sheets (CSS) and its specifications. All posts to this list must be about the development of the CSS specification itself. This list is also the preferred place for discussing working drafts that are published by W3C's CSS Working Group.