Memory encryption method compatible with a memory interleaved system and corresponding system

Abstract

A method for managing an operation of an encrypted global interleaved memory space physically implemented according to an interleaving addressing scheme in encrypted memory banks of a plurality of memories respectively belonging to a plurality of channels. The method includes providing each channel with a local address pointer configured to be incrementally moved along the global memory space each time the global memory space is addressed at the current address pointed by the pointer, and in an absence of movement of the local pointer of a channel during a time period, addressing the global memory space from the channel through the address interleaving with a specific transaction at the current address, and upon reception at the channel of the specific transaction having been initiated by the channel, re-encrypting data located at the current address with a new encryption key and incrementing the local address pointer to its next position.