i am making a code to embbed the water mark in an image block. That block is of 8X8 means 64 pixels. i use 5 MSB of all pixels(64*5=320), which generate the secrete data which is entered in remaining 3 LSB of pixel(64*3=60). Data is entered in randomly selected 160 bits of LSB, means 480 bits(320+160=480) are used for data out of 512 bit(64*8=512 bits). now here I have a statement that "feed 480 bits to generate 32 hash bit and place those bits in remaining 32 places (512-480=32)".So i need some help to generate hash bits..