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RecaptchaV2.NET

Implements a class that allows you to use Googles Recaptcha V2 library with .NET (Webforms or MVC)

Also implements Googles very badly documented Secure Token functionality mentioned here: https://developers.google.com/recaptcha/docs/secure_token

Secure Token requires the use of AES in EBC mode, with PKCS5/PKCS7 padding. The key and initialization vector are the first 16 bytes of your Google Recaptcha Secret Key SHA1 hash.

How to use

  • Download the source code
  • This is a Visual Studio 2015 / .NET 4.6 project, so make sure you are running Visual Studio 2015 or above
  • Open RecaptchaExample.aspx.cs and edit the google_site_key and google_secret_key strings and put in your appropriate recaptcha 2.0 site key and secret key in all 4 locations
  • Run the project

Notes

  • This uses the secure token variation of recaptcha by default, not the site specific version. If you wish to use the site specific version then call recaptcha.GetSiteSpecificRecaptchaHTML() function instead.

Acknowledgements

  • ReCaptchaV2.NET currently support Version 2 only. An existing .NET library is available for version 1.0 from Google.
  • This project is based off of work from here: Aliencube.ReCaptcha.NET and ReCaptchav2dotnet

Releases

  • 2015-08-04 - v1.0 First release

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Implementation of Googles Recaptcha 2.0 in .NET

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