双服务器模型下模幂运算外包新方案

For the modular exponentiation like,the existing outsourcing schemes often ignore the privacy requirements of specific scenarios and parameters.The designs usually protect the privacy of all four parameters,resulting in too high computational complexity.Based on two-server model,three different modular exponentiation outsourcing schemes are designed for different scenarios,and the original operation is converted into a new scheme through reasonable logical division.The scheme ensures that the privacy parameters can be correctly protected during the whole computing process,and the user verifiable probability can reach 1.The theoretical analysis and simulation results show that the user end cost of new schemes is substantially decreased compared with that of the existing schemes.