Nippon Telegraph and Telephone Corporation

Satoshi Tanaka

Ryo Kikuchi

Dai Ikarashi

Koki Hamada

Koji Chida

Shigeki Yamada

Hitoshi Fuji

Gen Takahashi

Rina Okada

Asami Miyajima

Shogo Masaki

Minoru Kubota

Katsumi Maruyama

A synthetic data generation apparatus codes a value of each of category attributes contained in original data into a value of a numerical attribute in accordance with a coding rule; generates first synthetic data from the original data after coding using a synthetic data generation method for numerical attributes; if the value of the numerical attribute which is contained in the first synthetic data and corresponds to the value of one of the category attributes exceeds a range of values that can be assumed by the value of that numerical attribute, converts the value of that numerical attribute to a value included in the range of values that can be assumed by the value of that numerical attribute; and decodes the value of the numerical attribute which is contained in the first synthetic data after conversion and corresponds to the value of one of the category attributes to the value of that category attribute in accordance with the coding rule to obtain synthetic data.

Synthetic data generation apparatus, method for the same, and program

Provided is a technique for performing statistical processing such as processing for obtaining parameters of logistic regression analysis faster than before. A secure statistical processing system includes a cross tabulation table computing devicethat performs secure computation on a cross tabulation table in which frequencies are in plain texts while keeping each record concealed; and a statistical processing devicethat performs predetermined statistical processing using the cross tabulation table in which frequencies are in plain texts. The cross tabulation table computing devicemay include a plurality of secure computation devicesN that perform secure computation on a cross tabulation table in which frequencies are fragments subjected to secret sharing while keeping each record concealed, and a management devicethat restores the fragments to compute the cross tabulation table in which frequencies are in plain texts.

Secret statistical processing systems, methods, statistical processing apparatus and program

A secret computation system is a secret computation system for performing computation while keeping data concealed, and comprises a cyphertext generation device that generates cyphertext by encrypting the data, a secret computation device that generates encrypted basic statistics by performing secret computation of predetermined basic statistics using the cyphertext while keeping the cyphertext concealed, and a computation device that generates decrypted basic statistics by decrypting the encrypted basic statistics and performs predetermined computation using the decrypted basic statistics.

Secret computation system and method

In a multiprocessor system, each processor module comprises a processor, a distributed shared memory, a distributed memory coupler for controlling copying between distributed shared memories and a distributed memory protector for protecting said distributed shared memory against illegal access. The distributed shared memories are assigned global addresses common to all the processor modules, and the distributed shared memory of each processor module has its addresses shared with the distributed shared memory of each processor module which is the destinatiion of data transfer. Message buffers and message control areas on the distributed shared memory are divided into areas specified by a combination of sending and receiving processor modules. A processing request area on the distributed shared memory is divided corresponding to each receiving processor module and arranged accordingly. The processing request area on the receiver's side distributed shared memory has a FIFO structure. The sender's side distributed memory coupler stores identifying information of the destination processor module between the processor module communication and, upon occurrence of a write into the distributed shared memory, sends a write address and write data to the destination processor module. The receiver's side distributed memory coupler copies the received write data into the distributed shared memory of the processor module to which the distributed shared memory coupler belongs, by receiving write address and write data from the sender's side distributed memory coupler.

Message passing system for distributed shared memory multiprocessor

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Musashino, Japan

Satoshi Tanaka