ASP.NET Core - Implement Captcha | Generate Captcha

Описание: 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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