Device of encryption and decryption and method for processing data

Abstract

Disclosed are a device for encryption and decryption and a method for processing data. The device may be implemented by a memory device with a three-dimensional NAND flash memory with high capacity and high performance. The device includes a memory array, a data-sensing circuit, and a memory controller. A memory block in the memory array includes a first memory string with a first bit-line and a second memory string with a second bit-line. The memory controller is configured to: obtain a codec key, wherein memory cells in a first memory sub-area are set according to the codec key, and memory cells in a second memory sub-area are programed according to a complementary codec key; generate bit-line voltages of the first and the second bit-lines according to an input data; bias the memory cells in the first and the second memory sub-areas; and, obtain an output data according to the data-sensing circuit.