Research on software upgrade in a large-scale network

The credit inquiry system is a large-scale network which is built by the People's Bank of China for users to query their own credit. It is composed of tens of thousands of inquiry machines distributed throughout the country. In this system, the software and hardware of inquiry machines may be different from each other. The traditional techniques of software upgrade are not suitable for this network. In order to solve the problem that the software upgrade in the banking system must be secure, automatic and controllable, and that each query machine must be upgraded accurately, this paper proposes a large-scale software upgrade scheme based on OpenCA and OpenSSL, which can accurately upgrade every inquiry machine in the credit inquiry system, and make the system extensible.