Design and smartphone implementation of chaotic duplex H.264-codec video communications

Baoju Chen, Simin Yu, Zeqing Zhang, David Day-Uei Li, Jinhu Lü

Research output: Contribution to journalArticlepeer-review


In this paper, a chaotic duplex H.264-codec-based secure video communication scheme is designed and its smartphone implementation is also carried out. First, an improved self- synchronous chaotic stream cipher algorithm equipped with a sinusoidal modulation, a multipli- cation, a modulo operation and a round down operation (SCSCA-SMMR) is developed. Using the sinusoidal modulation and multiplication, the improved algorithm can resist the divide-and- conquer attack by traversing multiple nonzero component initial conditions (DCA-TMNCIC). Meanwhile, also by means of the round down operation and modulo operation, on the premise that the DCA-TMNCIC does not work, the original keys cannot be further deciphered only by the known-plaintext attack, the chosen-plaintext attack and the chosen-ciphertext attack, respectively. Then, the Android low-level multimedia support infrastructure MediaCodec class is used to access low-level media encoder/decoder components and the H.264 hardware encod- ing/decoding is performed on real-time videos, so the chaotic video encryption and decryption can be realized in real-time by smartphones. Security analysis and smartphone experimental results verify the effectiveness of the proposed method.
Original languageEnglish
Article number2150045
Number of pages19
JournalInternational Journal of Bifurcation and Chaos
Issue number3
Publication statusPublished - 15 Mar 2021


  • chaotic duplex secure video communication
  • divide-and-conquer attack
  • chosen ciphertext attack
  • H.264 hardware encoding/decoding
  • smartphone implementation


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