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It doesn't need to be something that specifically targets asp.net core 1.0

You could use some something like 

https://www.google.com/recaptcha/intro/index.html to add captcha to your .net core project.

You can use Google recaptcha instead of implementing your own. Here is one implementation - http://dotnetthoughts.net/how-to-implement-recaptcha-for-asp-net-5/

ou can try this.

http://dotnetthoughts.net/implementing-basic-captcha-in-asp-net-5-mvc-6/ 

I didn't tried it in ASP.NET Core RTM. I developed it in ASP.NET Beta 6 Days. Please go through the below nice link to implement Capcha in ASP.NET application:

http://www.c-sharpcorner.com/UploadFile/0c1bb2/create-captcha-using-google-recaptcha-in-Asp-Net/

You can use the following nuget package. NuGet Package: https://www.nuget.org/packages/PaulMiami.AspNetCore.Mvc.Recaptcha/

Source Code: https://github.com/PaulMiami/reCAPTCHA

I hope this helps you. Regards, Manoj Kulkarni

Blog: http://dotnetcontext.com.