What are the tools of managing your factoring exposure, i. e. advance ratio, eligibility ratio?
管理保理的风险暴露有哪些工具，如：预付比例，合格率？
Proxy signature systems have great applications in e-business whose secure-ty is based on the difficulty of integer factoring or the difficulty of solving the common discrete logarithm problem.
代理签名体制在电子商务中的应用很广泛，目前的代理签名体制安全性主要是基于求解大数因子分解问题的困难性或求解离散对数问题的困难性。
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