Bidirectional authentication and tamper-proof data storage

Maxim Integrated Products’ DS28CN01 is a highly integrated secure memory device that provides bidirectional challenge-and-response authentication protection by using the internationally recognized SHA-1 (Secure Hash Algorithm) cryptographic algorithm. A 1kb EEPROM array and associated command set ensure tamper-proof storage of data written to the integrated nonvolatile data array. Each EEPROM page is protected against data modification by the SHA-1 algorithm, and also includes programmable write protection and EPROM/OTP (one-time-programmable) emulation modes.

The DS28CN01 is ideal for a broad range of cost-sensitive end equipment in which intellectual property needs to be protected and/or equipment features need to be securely controlled, such as network routers/switches, notebook PC battery packs, laser and inkjet printer cartridges, and GPS navigators.

Every DS28CN01 has a guaranteed unique, factory-programmed, read-only memory (ROM), 64-bit ID number that can be used for a variety of system-level functions including unique electronic serialization of equipment and network-node identification. The 64-bit ROM ID also serves as an integral element in the device's overall secure functionality as a dynamic variable within the SHA-1 computation.

Maxim Integrated Products, www.maxim-ic.com