Semiconductor chip having identification/encryption code

Details Semiconductor chip having identification/encryption code Semiconductor chip having identification/encryption code

1995-07-13

1998-08-25

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 21, 365103, H04L 900

Patent

active

057990808

ABSTRACT:
A code mechanism is provided in an integrated circuit for identifying the integrated circuit such as by serial number or for use in enabling the circuit and equipment housing the circuit. Fuses, antifuses, and programmable field effect transistors are used in an array for establishing a code. The code can be established by loading a register through the array and then reading the register. Alternatively,the contents of the register can be compared with a code provided by a user to enable the circuit. In another embodiment, a ROM is loaded with a table of encryption keys, and a user addresses the ROM by loading an address in a register or in a RAM.

REFERENCES:
patent: 4404654 (1983-09-01), Kamuro et al.
patent: 5119163 (1992-06-01), Ishihara et al.
patent: 5467396 (1995-11-01), Schossow et al.

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