1. A method for identifying a protocol at the origin of a flow of packets including the following steps: capture of the flow of the protocol to be identified, statistical classification of the flow, comprising an extraction of classification parameters and a comparison of the classification parameters with statistical models constructed during a learning phase, wherein the statistical classification includes: a first global statistical classification phase comprising a step for extracting global classification parameters calculated by applying statistical formulae on part or all of the flow, and a step for processing the global classification parameters from a statistical model constructed during a learning phase; a second sequential classification phase comprising a step for extracting sequential classification parameters representative of the time sequence of packets forming the flow, and a step for processing sequential classification parameters from a statistical model constructed during a learning phase; and a step for summarizing the results of the first and second classification phases for identifying the protocol at the origin of the flow.