Random coded integrated circuit structures and methods of making random coded integrated circuit structures

A randomized coded array, comprising:

• a dielectric layer on a semiconductor substrate;
• an array of openings extending through said dielectric layer;
• particles in a random set of less than all of said openings;
• and
• a same conductive material in each opening of said array of openings, wherein a first resistance of a pathway through said conductive material in openings containing said particles is different from a second resistance of a path through openings not containing said particles.

A physically unclonable function embodied in a circuit, comprising:

• a set of field effect transistors connected between a data line through respective resistors to ground and connected to respective row select lines;
• and
• wherein said corresponding resistors are embodied in a randomized coded array of contacts comprising:
• a dielectric layer on a semiconductor substrate;
• an array of openings extending through said dielectric layer;
• particles in a random set of less than all of said openings;
• and
• a same conductive material in each opening of said array of openings, wherein a first resistance of a pathway through said conductive material in openings containing said particles is different from a second resistance of a path through openings not containing said particles.