METHOD TO GENERATE RANDOM NUMBER USING PHYSICAL CHARACTERISTIC OF NONVOLATILE MEMORY CELL

摘要

PROBLEM TO BE SOLVED: To provide a flash memory system capable of generating a random number without another random number generator and a random number generation method of the same.SOLUTION: A random number generation method of a storage device includes the steps of: selecting one or more word lines; programming a page corresponding to the selected word line in the same data; providing random number readout voltage to the selected word line and reading the selected page; obtaining a random number from the readout data of the selected page. The storage device may be a flash memory. The present invention generates a random number using a characteristic of threshold voltage distribution of a flash memory cell. Since the present invention generates a random number using physical characteristic of the flash memory, it does not require another random number generator.