State information necessary to maintain securely is saved on a probabilistic basis onto a flash memory of protected memory chip. The protected memory chip has a communication logics that prevents access to the flash memory unless appropriate cryptographically protected instructions are given. By saving data on a probabilistic basis, the aging of the flash memory can be reduced so as to inhibit malicious destruction of the flash memory. The communication logics can also address different parts of the flash memory selectively so that any time the state information changes, something is written to the flash memory. To yet avoid premature aging of the whole flash memory, a dedicated disposable portion can be used for normal writing so that the remainder of the flash memory remains operable. Corresponding security circuitry, assembly module and computer programs are also described.