Explain how to hash a file. First, for signature matching of known files, the probability of a mismatch is extremely unlikely , even at the lowest bounds of the probability scale, now projected to be around 2 30 for MD5. To make a query, simply copy the file’s hash value (MD5 or SHA1). A file hash database of files to be searched for can be used to rapidly identify them on a system, even when their names have been changed in an attempt to obfuscate their true type. It allows you to keep your various sets of results and view them instantly, making it a much-improved workflow and workspace when compared to legacy versions. Thus, if a hash appeared in multiple hash sets, only the first one added would be included in the hash library. Make sure to place a check mark in the box directing EnCase to append the hash sets to the existing hash library. 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