Dallas Semiconductor’s battery-backupcontroller for data protection in point-of-sale terminals, the DS3600, is the first in a family of secure battery-management products.
It provides active tamper detection and rapid-erasure key memory, says Dallas, while supporting FIPS-140 security levels 3 and 4 and meeting the highest requirements of Common Criteria.
The device's proprietary, on-chip nonvolatile SRAM is used for storage of encryption keys. The DS3600's unique memory architecture prevents system stress from influencing the memory cell or data remnants from being detected. When the DS3600 generates a tamper alarm, the entire 64-byte array is cleared within 100 ns. This erasure of data is this fast because the memory's high-speed direct hardwired clearing function and on-chip power source ensure active erasure.
Integrated security
The DS3600 has tamper-detection inputs to interface with system voltages, resistive meshes, external sensors, and digital interlocks. Using a low-power operation, it also monitors those components continuously. The device monitors the integrated realtime-clock crystal oscillator and will invoke a tamper response if the oscillator frequency falls outside the set threshold. The internal digital temperature sensor has a programmable rate-of-change detector that protects the DS3600's encryption key memory from thermal attacks. The DS3600 constantly monitors primary power. In the event of a power failure, an external battery power source is automatically activated to keep the SRAM, RTC, and tamper detection circuitry alive.
Prior to the DS3600, numerous discrete components were required to perform all these same functions. The DS3600 is packaged in a CSBGA, a preferred choice for certification as no pins are exposed to the outside world making it resistant to tampering.
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