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本文提出了约束伪随机函数PRF构造的密钥空间、域和作用范围集合,通过具有双变量函数构造约束PRF的随机多项式时间算法和确定多项式时间算法,提出了用于最佳密钥长度广播加密的位固定约束PRF构造安装函数和附加算法函数,采用形式化方法分析了约束PRF的密钥安全属性,并将随机密钥事件函数的优势性忽略不计以保证约束PRF的安全属性,应用位固定约束PRF构造广播加密密钥系统,广播加密系统的接收密钥、实时或随机密钥库的密文具有最佳密文长度。
In this paper, we propose a set of key space, domain and range of confinement pseudorandom function PRF. By using the time-varying polynomial-time algorithm and the polynomial-time algorithm to construct constrained PRF with bivariate functions, we propose a scheme for optimal key length broadcast encryption Bit PRF constructively and formally, the formal algorithm is used to analyze the key security attributes of the constrained PRF, and the advantage of the random key event function is ignored to ensure the security attributes of the constrained PRF. The application bit is fixed The Constraint PRF constructs a broadcast encryption key system that broadcasts the receive key of the encryption system and has the best ciphertext length for real-time or random keystore ciphertexts.