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Secure EEPROM provides bidirectional authentication

Posted: 30 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:secure memory device? SHA-1 EEPROM device? bidirectional authentication?


Maxim Integrated Products has introduced the DS28CN01, a highly integrated secure memory device. DS28CN01 provides bidirectional challenge-and-response authentication protection by using the SHA-1 (Secure Hash Algorithm) cryptographic algorithm. A 1Kbit 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. DS28CN01 is well suited 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. Within these applications, DS28CN01 is used for managing reference designs, protecting IP, securing system settings, tracking the expiration of consumables and authenticating systems, board-level designs, accessories and peripherals.

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

Communication with the DS28CN01 is accomplished through an industry-standard, 400kHz I?C/SMBus-compatible interface that includes a programmable bus timeout feature to reset the interface if a bus-lockup fault condition is detected. DS28CN01 operates from 1.8V-5V over the -40C to 85C industrial temperature range. This device is packaged in an 8-pin microSOP housing. Pricing starts at 65 cents each for 1,000 quantities (FOB USA).

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