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Electronic commerce protocols are the basis of security in electronic commerce. Therefore, it is essential to ensure these protocols correctly. However, most current protocol analysis methods can only be used to analyze part of properties required by electronic commerce protocols. Rubin logic is a good method for analyzing security protocols. Considered the properties of electronic commerce protocols, extensions to Rubin logic are presented. A new local set as well as new actions and inference rules are introduced. Furthermore, the new steps of protocol analysis using the extended Rubin logic are presented. The extended Rubin logic can be used to analyze most of properties required by electronic commerce protocols.