Patent ID: 7316934

Claim:
A method for personalizing an electrical circuit having at least one layer having electrical characteristics, the layer being produced by an electrical characteristic determination process (ECDP), the method for personalizing comprising: providing a wafer suitable for producing thereon a plurality of electrical circuits each having at least one layer; and during production of the at least one layer: using a first ECDP on at least one photoresist layer to produce a pattern in the at least one photoresist layer corresponding to electrical circuitry having identical electrical characteristics on the wafer in each of the plurality of electrical circuits; using a second ECDP, including a personalization algorithm, on said at least one photoresist layer to produce a pattern therein which corresponds to a modification of at least one electrical characteristic of at least one of the plurality of electrical circuits; and developing said at least one photoresist layer after patterning thereof to produce said plurality of electrical circuits, said personalization algorithm being used for generating at least one of a random individualized digital number and a pseudo-random individualized digital number in each of said plurality of electrical circuits by selectively exposing said at least one photoresist layer thereby introducing said digital number.