  Secret data hiding in binary images is more difficult than other formats
since binary images require only one bit representation to indicate black and
white. This study proposes a new method for data hiding in binary images using
optimized bit position to replace a secret bit. This method manipulates blocks,
which are sub-divided. The parity bit for a specified block decides whether to
change or not, to embed a secret bit. By finding the best position to insert a
secret bit for each divided block, the image quality of the resulting
stego-image can be improved, while maintaining low computational complexity.The
experimental results show that the proposed method has an improvement with
respect to a previous work.
