Patent ID: 11880489
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 2:
3. A secure statistical processing method, comprising:
by cross tabulation table computing circuitry, performing secure computation on a cross tabulation table in which each record is concealed and frequencies of each record having a predetermined value are in plain text; and
by statistical processing circuitry, performing predetermined statistical processing using the cross tabulation table in which frequencies are in plain texts, including calculating parameters of logistic regression analysis, wherein
the method further includes:
performing, by a plurality of secure computation circuitries, secure computation on a cross tabulation table in which frequencies are fragments subjected to secret sharing while keeping each record concealed, and
restoring the fragments to compute the cross tabulation table in which frequencies are in plain texts, wherein
the plurality of secure computation circuitries randomly exchange records in performing the secure computation,
the plurality of secure computation circuitries perform the secure computation in parallel, and
the plurality of computation circuitries calculate the parameters of the logistic regression analysis by maximizing an error function whose arguments are the parameters.