  The future generation networks: Internet of things (IoT), in combination with
the advanced computer vision techniques poses new challenges for securing
videos for end-users. The visual devices generally have constrained resources
in respects to their low computation power, small memory with limited power
supply. Therefore, to facilitate the video security in smart environment,
lightweight security schemes are required instead of inefficient existing
traditional cryptography algorithms. This research paper provides the solution
to overcome such problems. A novel lightweight cipher algorithm is proposed
here which targets multimedia in IoT with an in-house name EXPer i.e. Extended
permutation with eXclusive OR (XOR). EXPer is a symmetric stream cipher that
consists of simple XOR and left shift operations with three keys of 128 bits.
The proposed cipher algorithm has been tested on various sample videos.
Comparison of proposed algorithm has been made with the traditional cipher
algorithms XOR and Advanced Encryption Standard (AES). Visual results confirm
that EXPer provides security level equivalent to the AES algorithm with less
computational cost than AES. Therefore, it can easily be perceived that the
EXPer is a better replacement of AES for securing real-time video applications
in IoT.
