A networked computer system enables a transaction to be executed securely. An initiator sends a service request to a control server. The control server creates a transaction server for the sole purpose of execution of the transaction requested by the service request. Creating the transaction server includes: selecting an IP address randomly from a pool of IP addresses and assigning the selected IP address to the transaction server; creating a DNS entry including a randomly-constructed hostname; and associating the DNS entry with the selected IP address. If the transaction server pre-exists, it is made accessible in response to receiving the service request. The control server informs the initiator of the created transaction server. The initiator engages in the transaction with the transaction server, independently of the control server. The transaction server terminates upon completion of the transaction or the expiration of a timeout period.