A method and system for tracing-back single packets based on storing only one record per flow, `FlowId`, observed by a router on a given interface and in a given time window `Time Period`. This record can be seen as a canonical representation for all packets seen during this window. A malicious packet may be traced back to its origin by identifying the port of arrival based on that packet time of arrival X and the FlowId.

 
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< Prefix processing technique for faster IP routing

> Voice clip identification method

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