  Images and video sequences carry large volumes of highly correlated and
redundant data. Applications like military and telecommunication require
encryption methods to protect the data from unwanted access. This requirement
in most cases needs to be realized in real-time. In this paper, we propose a
fast new Fiestal-structured approach for image and video encryption based on a
chaotic random sequence generator and a Permutation-Inverse Permutation (PIP)
pixel transform. This approach utilizes mathematical functions and transforms
with low complexity. The algorithm at the same time, ensures no drastic pay off
in terms of encryption quality. This renders the algorithm with promising scope
for real time applications and easy hardware implementation. MATLAB simulation
of the algorithm establishes its high quality of encryption in terms of
elevated entropy values and negligible correlation of the encrypted data with
the original. Simulation results also show high sensitivity to slight variation
in keys ensuring high security.
