Setting Cookie Secure Flag – ASP.NET

Method #1 Setting Secure Property True

Create Cookie by setting secure property true:

HttpCookie cookie = new HttpCookie('name');
cookie.Secure = True;
cookie.Value = 'Value';

Method#2 Using web.config

Add the following codes to web.config

<system.web>
<httpCookies requireSSL="true" />
</system.web>

Reference

https://www.owasp.org/index.php/SecureFlag