"We’ve recently partnered with Stripe to help make launching and backing projects easier. Stripe meets and exceeds the most stringent industry standards for security. You can learn more about the technical details of Stripe's secure infrastructure here [https://stripe.com/help/security] .
I have personally pledged to many projects and never had any problems with security. Kickstarter is the biggest and most well-known crowdfunding site. That's why I chose it for the Sproutlings anthology campaign. They take their brand and corporate image seriously.
The amount of your pledge and the reward selected are never publicly displayed — only the project’s creator will be able to see that information.