A system includes a network interface, at least one processing device, and at least one memory device. The at least one memory device stores instructions that when executed result in initiating creation of a single-use targeted link that provides access to a restricted access data entry system and serves the single-use targeted link through the network interface to a computer system of a targeted user with a time validity constraint. An access request received at the restricted access data entry system through the single-use targeted link is verified as being received within the time validity constraint. A network traffic throttling control reduces network traffic volume received through the single-use targeted link based on determining that the network traffic volume exceeds a traffic volume threshold. An identity control at the restricted access data entry system is applied to confirm entry of at least one identifying characteristic that matches the targeted user.