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一、引言广播密码体制,顾名思义,是用于广播信道(或卫星通信)的保密传输,但也可用于分区存取的数据库系统的保密,其通信的特点如图一所示:指定给n个接收者的明文记作P_i(i=1,2,…n),通过发送器用加密算法E_K加密,然后将得到的密文C通过通信信道广播给接收者,每个接收者R_i(i=1,2,…n)用脱密于密钥DK_((i))还原消息P_i。
I. INTRODUCTION The broadcast password system, as its name implies, is used for the confidential transmission of broadcast channels (or satellite communications) but can also be used for the confidentiality of partitioned database systems. The communication features are shown in Figure 1: n The plain text of the receiver is recorded as P_i (i = 1, 2, ... n), encrypted by the sender using the encryption algorithm E_K, and then the resulting ciphertext C is broadcast to the receiver over the communication channel. Each receiver R_i , 2, ... n) restores the message P_i with the key DK_ ((i)).