Secret sharing equipment, secret reconstruction device, secret sharing reconstruction system, secret sharing method, and secret reconstruction method

摘要

PROBLEM TO BE SOLVED: To provide a secret dispersing device which executes secret dispersion corresponding to the authority level of each member while suppressing the increase of an information amount of the dispersion information, a secret dispersing and reconstructing system, and a secret dispersing method, and also to provide a secret reconstructing device for reconstructing the information to which the secret dispersion is executed corresponding to the authority level, a secret dispersing and reconstructing system, and a secret reconstructing method.;SOLUTION: The secret dispersing device 100 has an ID radix generating part 104, to which original secret information S and the authority level L_i(i=1, 2,..., n) of each member are inputted and which calculates the secret ID_P for calculating a member ID_m_i equivalent to each of the authority levels L_i, the dispersion information X_i made to correspond to the original secret information S, a radix Y for generating the dispersion information, and the information desired to keep secret from the radix Y, and a dispersion information generating part 103 which calculates the dispersion information X_i to be distributed to each member from the calculated radix Y and the member ID_m_i.;COPYRIGHT: (C)2004,JPO&NCIPI