Abstract- This paper presents a method to integrate a new cryptography algorithm into the open source system OpenSwan for building a virtual private network (VPN). The OpenSwan plays an important role in confidential data in the virtual private network, specially for building a cloud computing system. Although there are several cryptography algorithms installed in OpenSwan, users need to use the other new algorithm in some typical cases for protecting their sensitive data so the studying to install a new cryptography algorithm in OpenSwan is necessary and useful. Based on analyzing priciple operating and source code of system, we proposed the model used to replace a crypto algorithm in OpenSwan. Experiment results show that the proposed method is easy and good performance.
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