Secure Printed Memory

摘要

The present invention discloses a secure printed memory. It comprises a laser-programmable read-only memory (LP-ROM) which stores at least a key. The key is written during manufacturing and different LP-ROMs store different keys. The output of the secure printed memory is encrypted with the key stored in the LP-ROM and is different for different devices. Compromising a single device does not compromise other devices.

主权项

1. A secure printed memory in a secure printed-memory family, comprising:
a semiconductor substrate; a printed memory formed on said semiconductor substrate for storing content data, wherein said content data are same for all devices in said secure printed-memory family; a laser-programmable read-only-memory (LP-ROM) formed on said semiconductor substrate for storing at least a key, wherein said key is written during manufacturing and different LP-ROMs store different keys; an encryption circuit formed on said semiconductor substrate for encrypting said content data in said printed memory with said key in said LP-ROM; wherein the output of said secure printed memory is the encrypted content data from said encryption circuit and is different for different devices in said secure printed-memory family.