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DISPERSION VALUE UPDATE DEVICE AND DISPERSION VALUE UPDATE PROGRAM, DISPERSION VALUE CALCULATION DEVICE AND DISPERSION VALUE CALCULATION PROGRAM, AND DISPERSION VALUE VERIFICATION DEVICE AND DISPERSION VALUE VERIFICATION PROGRAM
DISPERSION VALUE UPDATE DEVICE AND DISPERSION VALUE UPDATE PROGRAM, DISPERSION VALUE CALCULATION DEVICE AND DISPERSION VALUE CALCULATION PROGRAM, AND DISPERSION VALUE VERIFICATION DEVICE AND DISPERSION VALUE VERIFICATION PROGRAM
PROBLEM TO BE SOLVED: To reduce the number of communication times for updating a dispersion value.;SOLUTION: A terminal device 12 sets k-1 new update keys key 2j(t)(j=n-k+2, ..., n) to itself, and transmits, to a data server 14Pj, update keys key 2j(t-1)(j=h+1, ..., n) used before for generating random numbers to update a dispersion value, and keys key 2j(t)(j=h+1, ..., n) for generating random numbers to newly update the dispersion value this time. The data server 14Pj receives the transmitted keys key 2j(t-1) and key 2j(t), uses the received keys key 2j(t-1) and key 2j(t) to generate m update values (random numbers) uij(t-1) and uij(t), restores an initial dispersion value by subtracting the previous update value uij(t-1) from the current dispersion value Wij(t-1), then adds the update value uij(t), and thereby obtains a new dispersion value Wij(t).;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT
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机译：解决的问题：为了减少更新色散值的通信时间。解决方案：终端设备12设置k-1个新的更新密钥密钥2 j （t）（j = n-k + 2，...，n）自身，并将更新密钥密钥2 j <发送给数据服务器14P j Sup>（t-1）（j = h + 1，...，n）之前用于生成随机数以更新色散值，并使用键2 j （t）（j = h + 1，...，n）生成随机数以这次新更新色散值。数据服务器14P j 接收所发送的密钥密钥2 j （t-1）和密钥2 j < Sup>（t），使用接收到的键2 j （t-1）和键2 j （t）生成m个更新值（随机数）u ij （t-1）和u ij （t），通过从当前色散值W ij中减去先前的更新值u ij （t-1）来恢复初始色散值 （t-1），然后将更新值u ij （t）相加，从而获得新的色散值W ij （t） .;选定的图纸：图1;版权：（C）2018，JPO＆INPIT
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