Security and privacy for WLAN roaming with per-connection tariff negotiation

In this paper, we propose a novel protocol suite for roaming WLAN devices. It supports authentication, key agreement, and secure payment between roaming devices and network operators. This is achieved with the help of an integrated tick payment scheme. Our protocol suite allows operators to quickly change tariffs depending on current demand and allows users to choose between different operators and select from different tariff options on a per-connection basis. In addition, our protocol suite offers a very high degree of privacy protection by revealing only strictly required information to the participating parties.