A method of analyzing a payload generated according to an open automatic demand response protocol performed by a payload analyzer, the method comprising: determining a payload type using a transaction identifier of the payload; Generating a transaction pattern based on syntactic pattern recognition using the transaction identifier and the payload type if the transaction pattern is a pre-registration Determining whether the transaction pattern is a pre-registered pattern, determining the payload as a normal payload, and if the transaction pattern is a pattern not registered, determining the payload as an abnormal payload A method for analyzing a payload is disclosed.
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