Abstract: This paper discusses the problem in the credit management system of the universities and presents a security solution for them. The solution is based on the public key infrastructure technology. In the solution, the validation of user identity adopts the figure certificate, and the key data is figure validated. The data t ransmission adopts the secure socket layer. The authenticity, integrality and the undeniableness is realized. The credit management is the trend of the universities of China, and more and more universities put the credit system in practice. The implementation of the security solution, which assures the security of the credit management system, is of significant practical value.