As the paper by Niels Provos and Peter Honeyman entitled, "
Detecting Steganographic Content on the Internet " states, "The JPEG image format uses a discrete cosine transform (DCT) to transform successive 8_8-pixel blocks of the image into 64 DCT coefficients each. The least significant bits (LSB) of the quantized DCT coefficients are used as redundant bits into which the hidden message is embedded." In other words, each pixel block in a jpeg contains a small area that is basically worthless with regards to the image quality; however, this bit does provide a steganographer an excellent place to store data.