An environment friendly metal mechanical password lock cylinder capable of setting repeatedly password keys comprises password rebound leaves, a label panel, a fastener locking plate, a positioning plate, a fastener reset plate, an axis panel and a control plate. aM, or a solvate or hydrate thereof, wherein X is a conjugate base of an organic acid, M is a neutral organic molecule, and a is from 0. The method also includes aggregating the flow statistics to obtain a traffic profile of the network flows at the measurement point.