Safeguarding Forensic Integrity: The Role of Known File Filters in Cybercrime Investigations


A Known File Filter (KFF) presents a list of hashes for known files to ensure file integrity in a forensic investigation. Forensic investigators compare hashes listed in a Known File Filter (KFF) to verify that a file has not been modified by a third party before or during an investigation. It allows a Forensic Investigator, judge, attorney, or jury to quickly analyze if the hashes of two files do or do not match. This process encourages trust between the Forensic investigator, the judge, and the jury. A Known File Filter (KFF) enables a Forensic investigator to verify large files in a short concise manner for presentation during legal proceedings. Without a Known File Filter (KFF), Forensic investigators would struggle to wade through large files for comparison or verify the integrity of a file used in an investigation. 

Additionally, a Known File Filter (KFF) aids law enforcement in identifying illicit, inappropriate content, such as child pornography, without viewing it directly. Law enforcement facilities that routinely investigate cyber crimes often view the Known File Filter (KFF) prior to investigating a device throughout an investigation. Without a Known File Filter (KFF), child victims are further exploited as evidence changes hands in the course of an investigation. Instead of identifying, labeling, and isolating the inappropriate content, multiple individuals working throughout the investigation would view the illicit material imposing further harm on the victim. A Known File Filter aids to enforce ethical standards of decency in while holding criminals accountable and minimizing further damage to innocent victims.

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