随着数字电视的发展,如何保护知识产权不被大量非法复制和传播,对于拥有这些视频信号知识产权的企业而言,便显得尤为迫切和必要。本文首先介绍了用于对实时数据进行加密保护的HDCP协议以及该协议所使用的流密码算法,然后介绍了该流密码算法的硬件实现。所实现的流加密IP工作频率达到200MHz以上,完全可以满足高清视频信号加密的需要。 With the development of digital television, how to protect intellectual property rights from being illegally duplicated and disseminated in large quantities is particularly urgent and necessary for those enterprises that own the intellectual property rights of these video signals. This paper first introduces the HDCP protocol used to encrypt real-time data and the stream cipher algorithm used by the protocol, and then introduces the hardware implementation of the stream cipher algorithm. Streaming IP achieved operating frequency of 200MHz above, fully meet the needs of high-definition video signal encryption.