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[ASP.NET] Solution brief for CAPTCHA implementation in asp.net

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Posted on 5/12/2015 6:59:04 PM | | |

There are already many articles on the implementation of CAPTCHA in asp.net on the Internet, and the solution is also mature:



1. An open source control written in VB:
http://www.codeproject.com/KB/custom-controls/CaptchaControl.aspx



2. Implementing the captcha control in CSharp, the basic idea is to use bitmap to "draw" the text, and then use HatchBrush to add some dots.
http://www.codeproject.com/KB/aspnet/CaptchaImage.aspx



3. The following one is the same author as the first one, but it is implemented using Csharp:
http://captcha.codeplex.com/SourceControl/changeset/view/1478#31243



4. The most widely used should be:
http://www.google.com/recaptcha

Its asp.net plugin can be downloaded from here:

http://code.google.com/apis/recaptcha/docs/aspnet.html

There is also very detailed text on how to use it.



One thing to keep in mind is to remember to replace the public and private keys.

The plugin also offers a fully personalized interface, with the only regret being that many times the images it generates are not very clear -which is related to the creative team's original philosophy -- they want users to constantly improve their text recognition system.




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