【摘要】 以往的代理签密方案多数需要可信中心,可信中心经常会变成被攻击的目标,一旦可信中心遭到攻破,则整个通信系统全部暴露并导致毁灭性的后果。为了克服这一缺陷,在新方案中,无须可信中心参与,避免了对可信中心的攻击,使得安全性级别更高。此外,把双重门限技术引入代理签密方案中,其它任意少于k个参与者合作也无法伪造其它代理签密人的签密密文,同时本方案也把门限技术应用于对主密钥的管理上,大大降低了密钥泄露的可能性。更多还原

【Abstract】 A large number of proxy signcryption schemes have been proposed,usually requiring a trusted party,and the trusted party frequently becomes the target of atacks.Once the trusted party is breached,the entire communication system would be exposed,which means destructive consequences.To overcome this weakness,a new secure scheme is proposed without a trusted party.By applying double thresholds,any m(less than k) proxy signcrypters can not impersonate some other proxy signcrypters to generate a valid threshold proxy signcryption.Thresholds are also adopted in master key management,which helps to reduce the chances of key-compromises.更多还原