Nowadays, an agent-based mobile pa yment has become more popular. However, existing payment systems still lack of necessary mobile payment properties. Especially, they should be shorter and lightweight for making payment on the move. This paper introduces a new secure lightweight mobile bill payment protocol with assistance of an intermediary acting as an agent to collect and process payment requests made by clients. This protocol not only satisfies necessary transaction security properties, but it is also simple and compatible to existing mobile payment infrastructure.
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