Which security feature protects against Cross-Site Request Forgery in Magento EE v. 1.13?

The feature that specifically protects against Cross-Site Request Forgery (CSRF) in Magento EE v. 1.13 is indeed the CSRF protection mechanism. CSRF is a type of attack that tricks a victim into submitting a malicious request. In the context of Magento, this can occur when an authenticated user is misled into performing unwanted actions on a web application in which they're currently authenticated.

Magento incorporates CSRF tokens into forms and AJAX requests to ensure that actions are only performed by legitimate users. Each time a form is submitted, a unique token is generated and sent along with the request. This token is validated on the server side, ensuring that the action is initiated by the authenticated user and not by a malicious third party.

Other security features, while important for overall security, address different concerns. For example, Two-Factor Authentication enhances user account security by requiring an additional verification step but does not specifically prevent CSRF attacks. Similarly, secure transactions and data encryption focus on data protection during transmission and storage rather than preventing CSRF vulnerabilities.