Device and method for generating identification key by using semiconductor process

A method of designing a device for generating an identification key, the method comprising:

• disposing a transistor in a design layout of a semiconductor chip;
• disposing a contact in the layout, the contact being formed on the transistor, and an edge of the contact in a side facing a gate of the transistor being positioned so that a difference between a probability that the gate is shorted to a drain or a source by the contact and a probability that the gate is not shorted to the drain or the source is equal to or less than a predetermined threshold;
• and
• disposing a reader in the layout, the reader being configured to determine whether the gate is shorted to the drain or the source by the contact and to generate an identification key.

A method of manufacturing a device for generating an identification key, the method comprising:

• forming a transistor on a semiconductor wafer;
• forming a contact on the transistor, an edge of the contact in a side facing a gate of the transistor being positioned so that a difference between a probability that the gate is shorted to a drain or a source by the contact and a probability that the gate is not shorted to the drain or the source is equal to or less than a predetermined threshold;
• and
• forming a reader, the reader being configured to determine whether the gate is shorted to the drain or the source by the contact and to generate an identification key.