Lead Forensics

Hash-based matching

Hashes are unique digital identities for image or video content.   The technique of hash-based matching is utilized to detect data that has resemblance.

The process of assigning a unique hash value to an image using an algorithm is known as image hashing. Hash matching usually refers to a process where the hashes of images on an online service are compared to the hashes in a database of images already determines by human reviewers to be prohibited or illegal.

Hashes are sometimes also called “digital fingerprints. As when multiple copies of one image exist, they all share the same hash value. See also: Flagging

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