Based on the software evolution theory, this paper discusses the software trustworthiness growth process in which software trustworthiness gradually develops from low trustworthy state into high trustworthy state, presents the cycle model of software trustworthiness growth and summarizes the key factors of influencing trustworthiness growth. On this basis, the relative expansion concepts of trustworthy software are put forward, five typical characteristics of software trustworthiness are analyzed and software trustworthiness evolution system is constructed, which have great significance in correctly understanding the essence of software trustworthiness and exploring the strategy and technology of software trustworthiness growth.
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