Patent ID: 8615475

Claim:
A method comprising: comparing a test signature to each of a plurality of record signatures to generate for each record signature a respective match score using a self-calibrating method that involves a measure of the randomness of each bit in the record signature, wherein the measure of the randomness is derived from a process comprising performing a sliding cross-correlation of each of one or more putative match candidates of the record signatures against a best putative match candidate of the record signatures to determine a best correlation location and determining a number of times that the bit value of each bit of the best putative match candidate is the same as the bit value at the same bit position in each of the one or more putative match candidates at the best correlation location; and determining whether the test signature matches a particular record signature in the plurality of record signatures based on the particular record signature's respective match score and a match criterion, wherein the match criterion allows for a match with less than all bits in agreement.