METHOD TO PREVENT ANTI-REPLAY ATTACK

Abstract: a method performed by a system including a secure processing sub-system having an internal non-volatile memory, and a non-volatile memory that is external to the secure processing sub-system. during each power cycle where data stored in the external non-volatile memory is updated, the secure processing sub-system executes a transaction by writing a first transaction data marking the start of the transaction in the internal non-volatile memory upon a first update of the data within the power cycle, and at the end of the power cycle, in case the power cycle ends normally, writing a second transaction data marking the end of the transaction to the internal non-volatile memory. at the beginning of any power cycle, the secure processing sub-system checks if a transaction is still pending in the internal non-volatile memory, and if a transaction is still pending, prevents to use the data stored in the external non-volatile memory.

Inventor(s): Karine VILLEGAS, Fabien GREMAUD, Conor RYAN

CPC Classification: G06F21/75 (by inhibiting the analysis of circuitry or operation)

Search for rejections for patent application number 20250190630