safety certification document
安全认证文件
以上为机器翻译结果，长、整句建议使用 人工翻译 。
On the base of structural theorem of PDX system, An anti-counterfeit system of document in one-way certification was released. Its safety, popularization and technology superiority were discussed.
基于PDX体制构造理论，设计出一个单向认证票证防伪系统，分析该系统的安全性和推广应用的技术优势。
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