【摘要】 提出了一种新的基于大整数分解困难问题的叛逆者追踪方案。该方案的主要思想是构造两个特殊的参数A1,A2,与用户i对应的一对值(ai1,ai2)满足ai1+ai2=hmod(Ф(N)),其中h为一常数,欧拉函数(ФN)=(p-1)(q-1),解密时利用参数A1,A2和用户的私钥即可获得h。与现有两种方案相比,新方案具有黑盒子追踪、密文长度是常量、增加用户或撤消用户以及前向安全性和后向安全性等优点。更多还原

【Abstract】 A traitor tracing scheme on LIFP（large integer factoring problem）is proposed,the essential idea of which is that two special parameters A₁,A₂ are constructed,a pair （a i1,a i2） with respect to user i satisfiesa i1+a i2=h mod（Ф（N））,where h is a constant,（ФN）=（p-1）（q-1） is Euler Function. In decryption procedure,h can be obtained by parameters A₁,A₂ and user’s private key. Compared with the existing two traitor tracing schemes,this scheme has many advantages such as black-box traitor tracing,ciphertexts of constant size,adding or revoking users,forward security and backward security.更多还原