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Network-based crime has been increasing in both extent and severity and network-based forensics encapsulates an essential part of legal surveillance. A key network forensics tool is trace back, which can be used to identify true sources of suspects. Both accuracy and secrecy are essential attributes of a successful forensic trace back. In this paper, we present a class of hopping based spread-spectrum techniques for forensic trace back, which fully use the benefits of the spread spectrum approach and preserves a greater degree of secrecy. Our proposed techniques, including Code Hopping-Direct Sequence Spread Spectrum (CHDSSS), Frequency Hopping-Direct Sequence Spread Spectrum (FH-DSSS), and Time Hopping-Spread Spectrum (TH-DSSS), operate to randomize the effects of marking traffic through both the time and frequency domains. Our simulation study validates these techniques in terms of accuracy and secrecy.

On Effectiveness of Hopping-Based Spread Spectrum Techniques for Network Forensic Traceback