Nuvoton Technology Corporation

Boaz Tabachnik

Ziv Hershman

Moshe Alon

Avraham Fishman

Eyal Cohen

Ben Bender

Yael Kanter

A chip system comprising ROM code including a bootloader which runs whenever the chip is powered on; and programmable fuse array memory storing version identifiers, NVMs in which copies of a version of bootable firmware are stored, wherein a first identifier is stored including active major number and minor numbers, signed with a private key; wherein a second identifier is stored including recovery major and minor numbers, signed with said private key; and hardware which obeys a first command by the boot ROM code to disable until next system reset, writing to the recovery NVM other than to the bootloader, and obeys a second command, to lift write protection of the recovery NVM, wherein firmware images associated with both said versions, and both said identifiers, are signed with said private key, and the boot ROM code authenticates firmware image/s and said identifiers.

Security system and method for preventing rollback attacks on silicon device firmware

A method for data storage includes storing data in a set of memory blocks of a non-volatile memory. Each memory block, which holds a respective portion of the data, is classified as valid or invalid depending on whether the memory block holds a most updated version of the portion, and as anchor or non-anchor depending on whether the portion belongs to a coherent snapshot of the data. Upon recovering from a power interruption, the coherent snapshot of the data is reconstructed from the memory blocks, based on classification of the memory blocks as valid or invalid and as anchor or non-anchor.

Maintaining data-set coherency in non-volatile memory across power interruptions

Growing community of inventors

Gimzo, Israel

Boaz Tabachnik