摘要： 介绍了一种新型的视频流加密系统设计方法，并结合无线通信中常用的交织技术，提出了一种新型的密钥分发管理机制和改进型OFB加密工作模式。提出的加密方法保留了TS包结构，硬件实现简单，协议开销小，安全性高，适用于AES和SM4等加密算法，可以广泛应用于无线图像传输及数字电视广播系统中。

中图分类号： TN918
文献标识码： A
DOI：10.16157/j.issn.0258-7998.191345
中文引用格式： 范晶，贾旭光. 基于改进型OFB模式的视频流加密方法[J].电子技术应用，2021，47(2)：63-66.
英文引用格式： Fan Jing，Jia Xuguang. A new video encryption method based on modified OFB mode[J]. Application of Electronic Technique，2021，47(2)：63-66.

A new video encryption method based on modified OFB mode

Abstract： A new design of video stream encryption system is introduced，combined with the interleave technology，which is widely used in wireless communication. This paper provided a new key distribution and management system and a modified Output-Feedback encryption operate mode. The provided method keeps the structure of the transport steam packet, has a low protocol cost and a high level of security, compatible with the AES and SM4 encryption algorithm, thus can be easily implemented in hardware and widely used in wireless image transmission and digital video broadcasting system.

Key words : OFB；transport stream(TS)；encryption；key distribution