[论文解读] Enhancing Selective Encryption for H.264/AVC Using Advanced Encryption Standard

Mohamed Abomhara, Omar Zakaria+3 more|arXiv (Cornell University)|Jan 10, 2022

Chaos-based Image/Signal Encryption参考文献 53被引用 43

一句话总结

论文提出一个系统，按需对使用 AES 的 H.264/AVC 编码流的部分进行加密，聚焦对 I-frames 的加密以确保实时视频传播。

ABSTRACT

Multimedia information availability has increased dramatically with the advent of mobile devices. but with this availability comes problems of maintaining the security of information that is displayed in public. Many approaches have been used or proposed for providing security for information dissemination over networks, protection system classified with more specific as encryption information, and combination between video compression and encryption to increase information security. The strength of the combination between Video compression and encryption science is due to the nonexistence of standard algorithms to be used in video compression and encrypting secret video stream. Also there are many ways could be used in video encryption methods such as combining several different encryption methods with video compression to pass a secret video streaming. Furthermore, there is no formal method to be followed to discover an encrypted video. For this reason, the task of this paper becomes difficult. In this paper proposed a new system of video encryption is presented. The proposed system aim to gain a deep understanding of video data security on multimedia technologies, to investigate how encryption and decryption could be implemented for real time video applications, and to enhance the selective encryption for H.264/AVC. The system includes two main functions; first is the encoding/encryption of video stream, through the execution of two processes (the input sequences of video is first compressed by the H.264/AVC encoder, and the encoded bit stream (I-frame) is partially encrypted using AES block cipher). And the second function is the decryption/decoding of the encrypted video through two process (specify the encrypted I-frame stream, decryption of the I-frame, and decoding with H.264/AVC decoder). The system is implemented by using Matlab.

研究动机与目标

• 理解在多媒体技术中如何为实时视频应用实现加密与解密。
• 研究并提升对 H.264/AVC 的选择性加密。
• 开发一个用于视频流编码/加密和解码/解密的两进程系统。

提出的方法

• 使用 H.264/AVC 对视频进行编码；使用 AES 块加密对编码后的 I-frame 进行部分加密。
• 实现一个两阶段过程，使用 H.264/AVC 解码器对经过加密的 I-frame 进行解密和解码。
• 使用 Matlab 的原型实现来说明工作流程。

实验结果

研究问题

• RQ1 如何将选择性加密与 H.264/AVC 编码集成，以保护视频流？
• RQ2 以选择性的方式使用 AES 对实时视频进行加密/解密的可行性如何？
• RQ3 对编码比特流中 I-frames 的加密有哪些实际考虑因素？

主要发现

• 提出一个两阶段系统：I-frames 的编码/加密和 I-frames 的解密/解码。
• 该方法针对 I-frame 的部分加密以保护视频流。
• 系统在 Matlab 中实现以演示工作流程。