Abstract
In actual application scenarios of the real-time video confidential communication, encrypted videos must meet three performance indicators: security, real-time, and format compatibility. To satisfy these requirements, an improved bitstream-oriented encryption (BOE) method based chaotic encryption for H.264/AVC video is proposed. Meanwhile, an ARM-embedded remote real-time video confidential communication system is built for experimental verification in this paper. Firstly, a 4-D self-synchronous chaotic stream cipher algorithm with cosine anti-controllers (4-D SCSCA-CAC) is designed to enhance the security. The algorithm solves the security loopholes of existing self-synchronous chaotic stream cipher algorithms applied to the actual video confidential communication, which can effectively resist the combinational effect of the chosen-ciphertext attack and the divide-and-conquer attack. Secondly, syntax elements of the H.264 bitstream are analyzed in real-time. Motion vector difference (MVD) coefficients and direct-current (DC) components in Residual syntax element are extracted through the Exponential-Golomb decoding operation and entropy decoding operation based on the context-based adaptive variable length coding (CAVLC) mode, respectively. Thirdly, the DC components and MVD coefficients are encrypted by the 4-D SCSCA-CAC, and the encrypted syntax elements are re-encoded to replace the syntax elements of the original H.264 bitstream, keeping the format compatibility. Besides, hardware codecs and multi-core multi-threading technology are employed to improve the real-time performance of the hardware system. Finally, experimental results show that the proposed scheme, with the advantage of high efficiency and flexibility, can fulfill the requirement of security, real-time, and format compatibility simultaneously.
Highlights
Real-time video communication is widely used in military, business, entertainment, and personal social activities, such as video conferencing, live video, and video surveillance [1,2,3,4].the openness of the internet leads to many security risks in video communication.Cybersecurity incidents such as malicious attacks, illegal access, information leakage, theft, and evil tampering are frequently reported
According to the chaotic encryption and decryption algorithms given in Equations (24)
The real-time video confidential communication system is tested in the real network environment under the 640 × 480 video resolution
Summary
Real-time video communication is widely used in military, business, entertainment, and personal social activities, such as video conferencing, live video, and video surveillance [1,2,3,4].the openness of the internet leads to many security risks in video communication.Cybersecurity incidents such as malicious attacks, illegal access, information leakage, theft, and evil tampering are frequently reported. Real-time video communication is widely used in military, business, entertainment, and personal social activities, such as video conferencing, live video, and video surveillance [1,2,3,4]. The openness of the internet leads to many security risks in video communication. Cybersecurity incidents such as malicious attacks, illegal access, information leakage, theft, and evil tampering are frequently reported. Many studies have shown that end-to-end encryption is an effective way to protect cyber information and personal privacy [5,6,7,8,9]. The end-to-end encryption is a necessary means for real-time video confidential communication
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