基于FMECA的信息系统软件失效安全风险评估与预测

摘要

With a large number of software products used in information system, the probability of software failure on the system safety is inevitably increased. In this paper, a information system message sending and receiving process is introduced as an example. Using the FMECA method, the safety risks in message sending and receiving process caused by software, also the common failure modes causing the risks are analyzed. And the Markov model is introduced for predicting the serious haz-ard risk caused by software failure. The software failure causes can quickly be positioned by combining the Markov model with FMECA method, and the loss of system caused by software failure can be reduced.%随着大量软件产品应用于信息系统，不可避免地增大了软件失效对系统安全的影响概率。以某信息系统文电收发的处理过程为例，引入FMECA法，对其文电收发处理过程中由软件造成的风险进行分析，同时分析了引起风险常见的失效模式，并引入Markov模型对软件失效造成系统严重危害的风险进行预测，通过Markov模型与FMECA法结合能够迅速定位软件失效的原因，减少因软件失效造成的系统损失。