The JPEG image format is a widely used compressed format. For JPEG images, as early as in 1997, Upham 
first developed a famous hiding tool for JPEG images named Jpeg-Jsteg, where the secret data are embedded into the least significant bits (LSBs) of the quantized DCT coefficients whose values are not 0, 1 or −
1. Westfeld 
developed the so-called F5 algorithm, which implements matrix encoding to improve the embedding efficiency. In addition, F5 also employs permutative straddling to uniformly spread out the changes over the whole steganogram. Both these methods are irreversible with a low capacity. In the same year, Fridrich et al.