ASP.NET Core - Implement Captcha | Generate Captcha

Basically, we use Captcha on webpages to check webpages are accessed by humans not by bots. Without Captcha on webpages, there can be various attacks such as DOS (denial of service) attacks where Login page or registration page can be scripted and submit by using bots.
You can see Captcha are mostly used on Login, forgot password, Registration page right after logging into a web application we won’t use it mostly.

DNTCaptcha.Core is a captcha generator and validator for ASP.NET Core applications.

Steps:
- Installing DNTCaptcha.Core Package from NuGet Package
- Adding DNTCaptcha.Core TagHelper in _ViewImports.cshtml file .
Adding @addTagHelper *, DNTCaptcha.Core directive to _ViewImports.cshtml file makes
DNTCaptcha.Core Helpers available to the View
- Adding Model
- Adding Controller and Action Method
- Registering DNTCaptcha.Core Captcha Service in Startup class ConfigureServices method
We have added AddDNTCaptcha Service here we have various options to configure we can use
different Storage provider such as:
1. SessionStorageProvider
2. MemoryCacheStorageProvider
3. CookieStorageProvider
4. DistributedCacheStorageProvider

- Adding Captcha on Login View
- Code Snippet of Login View
- Validate Captcha on Post Request


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