In order to resolve the security problem of the shot-length data transmission for spacecraft telecommand and telemetry, a combined encipher system CES, which is based on the physical chaos generator, stream cipher and block ciphers, is proposed in this paper. The effectiveness of the physical chaos generator, stream cipher and block ciphers in the CES were respectively analyzed. The analysis demonstrates that the stream cipher increases the entropy of the length of the cipher-text and the physical chaos generator increases the entropy of the contents of the cipher-text. The CES will insure the security of short-length data transmission and also afford the reliable authentication for the data.%为解决短长度航天器测控数据的安全传输问题,提出了基于物理噪声源、序列密码算法和分组加密算法的复合加密算法CES;分析了CES算法中物理噪声源、序列密码和分组密码算法的作用;指出了序列密码给同长度明文的密文长度加熵、物理噪声源给相同明文的密文形式加熵.CES算法确保了短小指令集传输的安全性并具有安全可靠的认证功能.
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