The multimedia information, especially video and audio information, regarded as a common data stream, with the
traditional encryption technology encrypted, ignoring the characteristics of multimedia data, has some limitations. On the
other hand, chaotic sequences have several good properties including the ease of their generation, their sensitive
dependence on their initial condition and so on. Therefore, this paper discussed image encryption arithmetic on the basis
of chaotic sequences through dispersing the real number value chaotic sequences into symbol matrix and transformation
matrix, and then encrypted the image. Preliminary results proved that the image encryption arithmetic based on chaotic
sequences possesses the traits, namely fast speed for encryption speed, perfect results for encryption.