主题：开个帖作为学术翻译问题请教专帖 -- 冰与火

把结论的开头部分拿过来当摘要的开头。

There is a general belief in the security community that the correct explication of security should be formulated in terms of

Shannon-style information flow .This paper gives an approach to it . We use

random variable vectors and their functions to express information's

secure attribute and information processing, defines the security of system by secure attributes of input entity and output entity, and analyze the security policy from information flow from the input to the output of system by tracing the operation sequences.