Data hiding method and data hiding system

A data hiding system, comprising:

• a processor;
• and
• a memory coupled to the processor and having instructions stored thereon;
• wherein the processor, when executing the instructions, is configured
• for converting data into a bit sequence;
• when a number of bits in the bit sequence is odd, filling a bit at an end of the bit sequence, and assigning 0 or 1 to the filled bit;
• for extracting values of two bits every time from the bit sequence according to an order of the bit sequence as a set, to obtain M bit value sets, where M is a number of the bit value sets;
• setting a value of a previous bit of the two bits in each bit value as a first bit value in the bit value set, and the value of a later bit of the two bits as a second bit value in the bit value set;
• for dividing a rectangular image as a carrier of the data into P square image blocks with a same size, P is a number of the square image blocks, P≥M, and extracting the first M square image blocks therein;
• each square image block in the M square image blocks has a first diagonal line and a second diagonal line;
• for detecting gray values of each pixel on the first diagonal line and the second diagonal line of each square image block in the M square image blocks, to obtain pixel gray value sequences of the first diagonal line and the second diagonal line of each square image block, and detecting the parity of the inverse number of each pixel gray value sequence, to obtain the parity of the inverse number of each of the pixel gray value sequences of the first diagonal line and the second diagonal line of each square image block;
• for representing a value of a bit with the parity of the inverse number of the pixel gray value sequence of each diagonal line, and according to a principles on a one-to-one correspondence between the M square image blocks and the M bit value sets and a correspondence between the parity of the inverse numbers of the pixel gray value sequences of the first diagonal line and the second diagonal line of each square image block and the first bit value and the second bit value in the bit value set corresponding to the square image block, detecting whether the values represented by the parity of the inverse numbers of the pixel gray value sequences of the first diagonal line and the second diagonal line of each square image block in the M square image blocks are respectively consistent with the first bit value and the second bit value in the bit value set corresponding to the square image block, if no, regulating a pixel position on the square image block, so that the values represented by the parity of the inverse numbers of the pixel gray value sequences of the first diagonal line and the second diagonal line of the square image block are respectively consistent with the first bit value and the second bit value in the bit value set corresponding to the square image block.