Forensic Hashing In Criminal And Civil Discovery

After reading an earlier IP/Decode post about hashing, my friend Jenny Rossman reached out to explain how law enforcement was using hash values to fight the spread of child pornography. For over a decade, Jenny had been a sex crimes prosecutor in Florida. She, alongside law enforcement, had been using the technique to identify suspects and secure convictions. It is a brilliant use of hashing that is also worth considering in civil cases, particularly trade secret litigations.

Using Forensic Hashing to Fight Child Pornography

As I wrote in the earlier post, hashing can convert files to shorter strings of numbers and letters (the "hash value"). To demonstrate this, below is a set of five files that contain different content. I computed their unique hash values using the MD5 algorithm: