Extraction method of physically unclonable function and memory device

Abstract

Disclosed are an extraction method for a physically unclonable function (PUF) and a memory device. The memory device may be a three-dimensional NAND flash memory with high capacity and high performance. The extraction method includes: providing a memory block, the memory block includes a plurality of memory sub-blocks; selecting a plurality of memory sub-blocks to be chosen among the memory sub-blocks; forming a combination of the memory sub-blocks to be chosen among the memory sub-blocks to be chosen; selecting a plurality of bits to be chosen among bits of a preset memory area in each of the memory sub-blocks to be chosen; performing a weak PUF processing operation on the preset memory area in each of the memory sub-blocks to be chosen; and, performing a multi-sub-block read operation to the preset memory area in the combination to extract a strong PUF data according to the bits to be chosen in the preset memory area read by the multi-sub-block read operation.