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Web-based applications are being more and more widely used, and electronic document safety technology is considered as an important technique to ensure the integrity of data. The traditional approaches are either inefficient or insecure to achieve non-repudiation in electronic commerce. This article presents a method that could resolve this problem. We develop a cryptographic module, which is based on RSA algorithm, and it supports not only international standard cryptographic algorithm such as RC2, RC4, 3DES but also algorithms developed by domestic researcher. On the base of it, we design a cryptographic service provider for using it to realize the secure document management.