Patents by Inventor Kazuma OHARA

Kazuma OHARA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220141000
    Abstract: An information processing apparatus that performs bit embedding processing by four-party MPC using 2-out-of-4 replicated secret sharing stores a seed to generate a random number used when performing an operation concerning shares, generates, by using the seed, share reconstruction data for reconstructing a share used when performing bit embedding, and constructs a share for bit embedding by using at least the share reconstruction data.
    Type: Application
    Filed: February 12, 2019
    Publication date: May 5, 2022
    Applicant: NEC Corporation
    Inventors: Hikaru TSUCHIDA, Toshinori ARAKI, Kazuma OHARA, Takuma AMADA
  • Publication number: 20220129567
    Abstract: There is provided an information processing apparatus that executes efficient type conversion processing in four-party computation using 2-out-of-4 replicated secret sharing. The information processing apparatus comprises a basic operation seed storage part, a reshare value computation part, and a share construction part. The basic operation seed storage part stores a seed for generating a random number used when computation is performed on a share. The reshare value computation part generates a random number using the seed, computes a share reshare value using the generated random number, and transmits data regarding the generated random number to other apparatuses. The share construction part constructs a share for type conversion using the data regarding the generated random number and the share reshare value received from other apparatuses.
    Type: Application
    Filed: February 12, 2019
    Publication date: April 28, 2022
    Applicant: NEC Corporation
    Inventors: Hikaru TSUCHIDA, Toshinori ARAKI, Kazuma OHARA, Takuma AMADA
  • Patent number: 11315037
    Abstract: There is provided a system for computing a secure statistical classifier, comprising: at least one hardware processor executing a code for: accessing code instructions of an untrained statistical classifier, accessing a training dataset, accessing a plurality of cryptographic keys, creating a plurality of instances of the untrained statistical classifier, creating a plurality of trained sub-classifiers by training each of the plurality of instances of the untrained statistical classifier by iteratively adjusting adjustable classification parameters of the respective instance of the untrained statistical classifier according to a portion of the training data serving as input and a corresponding ground truth label, and at least one unique cryptographic key of the plurality of cryptographic keys, wherein the adjustable classification parameters of each trained sub-classifier have unique values computed according to corresponding at least one unique cryptographic key, and providing the statistical classifier, whe
    Type: Grant
    Filed: March 14, 2019
    Date of Patent: April 26, 2022
    Assignees: NEC Corporation Of America, Bar-Ilan University, NEC Corporation
    Inventors: Jun Furukawa, Joseph Keshet, Kazuma Ohara, Toshinori Araki, Hikaru Tsuchida, Takuma Amada, Kazuya Kakizaki, Shir Aviv-Reuven
  • Patent number: 11290456
    Abstract: A random number generation server device includes a random number generation unit generating random numbers, a share addition unit generating secret shared data masked using random numbers and the secret shared data of operands in secret equality determination, a secret shared data generation unit generating secret shared data of inputted values, a secret shared data restoration unit obtaining the original values by restoring the secret shared data, and a determination bit-conjunction unit using the secret shared data to perform secret equality determination. A mask value restoration server device includes a secret shared data generation unit, a secret shared data restoration unit, and a determination bit-conjunction unit. A secure computation server device includes a secret shared data generation unit, a secret shared data restoration unit, and a determination bit-conjunction unit.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: March 29, 2022
    Assignee: NEC CORPORATION
    Inventors: Hikaru Tsuchida, Toshinori Araki, Kazuma Ohara
  • Patent number: 11290265
    Abstract: A server device, a secret equality determination system, a secret equality determination method and a secret equality determination program recording medium are provided which, regardless of the server sharing scheme, can run with no difference in the number of communication rounds, whether carried out with a ring of order 2 or with a ring of an order greater than 2. This server device is provided with a secret shared data generation unit, a data storage unit, a mask unit, a random number share bit-conjunction unit, a random number share generation unit, a determination bit-conjunction unit and a secret shared data restoration unit. The secret shared data generation unit generates secret shared data. The data storage unit stores the secret shared data. The mask unit uses random number secret shared data to mask certain shared data. The random number share generation unit generates random number shares in which random numbers are secretly shared.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: March 29, 2022
    Assignee: NEC CORPORATION
    Inventors: Hikaru Tsuchida, Toshinori Araki, Kazuma Ohara
  • Publication number: 20220092172
    Abstract: A verification apparatus acquires a source code for multiparty computation, while changing a combination of options settable to a multiparty computation compiler, compiles the source code for each combination of options to generate a plurality of multiparty computation executable codes, selects at least one multiparty computation executable code from the plurality of multiparty computation executable codes as a verification code and provides the at least one verification code to a verification environment of multiparty computation, generates an evaluation index with respect to an execution result of at least one verification code in the verification environment, and selects at least one recommended code from the plurality of multiparty computation executable codes, based on the evaluation index corresponding to at least one verification code and outputs the selected recommended code.
    Type: Application
    Filed: January 9, 2019
    Publication date: March 24, 2022
    Applicant: NEC Corporation
    Inventors: Hikaru TSUCHIDA, Takao TAKENOUCHI, Toshinori ARAKI, Kazuma OHARA, Takuma AMADA
  • Patent number: 11273825
    Abstract: A vehicle control device includes a recognizer configured to recognize a surrounding situation of a vehicle and a driving controller configured to control acceleration, deceleration, and steering of the vehicle independently of an operation of an occupant of the vehicle on the basis of a recognition result of the recognizer. When it is recognized that the vehicle passes through a complex intersection where two or more intersections are combined by turning left or right at the complex intersection, the recognizer excludes at least a traffic signal closest to the vehicle among traffic signals present at positions capable of being visually recognized from the vehicle in a traveling direction of the vehicle from traffic signals whose states are required to be taken into account by the vehicle in a state in which the vehicle has entered the complex intersection.
    Type: Grant
    Filed: November 4, 2019
    Date of Patent: March 15, 2022
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Suguru Yanagihara, Takayasu Kumano, Takuya Niioka, Kazuma Ohara, Yuki Motegi
  • Publication number: 20220069980
    Abstract: An information processing apparatus comprises a partial modular exponentiation calculating part and a partial modular exponentiation synthesizing part. The partial modular exponentiation calculating part is given a base in plaintext and a modulo in plaintext and shared exponents and calculates a partial modular exponentiation that equals a set of shared values according to a modular exponentiation of the base raised by the shared exponent. The partial modular exponentiation synthesizing part calculates shared values of the modular exponentiation from the partial modular exponentiation that equals shared values relating to the modular exponentiation of a sum of shared exponents.
    Type: Application
    Filed: January 24, 2019
    Publication date: March 3, 2022
    Applicant: NEC Corporation
    Inventors: Kazuma OHARA, Toshinori ARAKI
  • Patent number: 11247692
    Abstract: A prediction device including: a recognizer recognizing a road structure and another vehicle in the vicinity of a subject vehicle; and a predictor predicting a running locus of the other vehicle recognized by the recognizer in the future on the basis of the road structure recognized by the recognizer in a predetermined situation, wherein, in the predetermined situation, in a case in which at least a part of the road structure used for predicting the running locus of the other vehicle in the future is not recognizable for the recognizer, the predictor predicts the running locus of the other vehicle in the future on the basis of a running locus of the other vehicle in the past acquired on the basis of a result of recognition in the past that is acquired by the recognizer.
    Type: Grant
    Filed: January 9, 2019
    Date of Patent: February 15, 2022
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Kazuma Ohara, Yosuke Sakamoto, Yuki Motegi
  • Publication number: 20220035608
    Abstract: There is provided a conversion apparatus with which a secure computation execution environment may be easily constructed. The conversion apparatus comprises an input part and a conversion part. The input part inputs a source code. The conversion part converts the input source code so that a secure computation compiler processes it based on setting information relating to secret computation executed by a plurality of secure computation servers.
    Type: Application
    Filed: September 20, 2018
    Publication date: February 3, 2022
    Applicant: NEC Corporation
    Inventors: Toshinori ARAKI, Hikaru TSUCHIDA, Kazuma OHARA
  • Publication number: 20210351916
    Abstract: When an absolute value of a difference value between a first share and a second share which are secret-shared is less than or equal to a natural number t, the information processing apparatus calculates the difference value between the first share and the second share. Furthermore, the information processing apparatus performs a comparison in magnitude of the first share and the second share using bit-decomposition from a least significant bit to an m-th bit (m being a natural number) of the difference value.
    Type: Application
    Filed: October 11, 2018
    Publication date: November 11, 2021
    Applicant: NEC Corporation
    Inventors: Hikaru TSUCHIDA, Toshinori ARAKI, Kazuma OHARA
  • Publication number: 20210334099
    Abstract: A method for multiparty computation wherein a plurality of parties each compute a preset function without revealing inputs thereof to others, comprises: each of the parties performing a validation step to validate that computation of the function is carried out correctly, wherein the validation step includes: a first step that prepares a plurality of verified multiplication triples and feeds a multiplication triple to a second step when required; and the second step that consumes a randomly selected multiplication triple generated by the first step, wherein the first step performs shuffling of the generated multiplication triples, in at least one of shuffle in a sequence and shuffle of sequences.
    Type: Application
    Filed: May 18, 2017
    Publication date: October 28, 2021
    Applicants: NEC CORPORATION, BAR-ILAN UNIVERSITY
    Inventors: Toshinori ARAKI, Kazuma OHARA, Jun FURUKAWA, Lindell YEHUDA, Nof ARIEL
  • Patent number: 11157751
    Abstract: A traffic guide object recognition device includes an imager configured to image surroundings of a vehicle and a recognizer configured to recognize surrounding circumstances of the vehicle. The recognizer selects a traffic guide object which the vehicle is to follow on the basis of forms of traffic guide objects in an image captured by the imager out of traffic guide objects which are provided near the vehicle.
    Type: Grant
    Filed: November 13, 2019
    Date of Patent: October 26, 2021
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Takayasu Kumano, Takuya Niioka, Kazuma Ohara, Suguru Yanagihara
  • Patent number: 11126709
    Abstract: A method for performing secure computations on records, comprising: receiving a request to apply a computation on a record; assigning a respective partial record of a plurality of partial records of the record to each of a plurality of computational processes; instructing each of the plurality of computational processes to perform a computation scheme comprising: applying a semi honest multiparty computation on the partial record; iteratively repeating a predetermined number of times: using a secure multiparty arithmetic computation to generate random terms; using the secure multiparty arithmetic computation to assign the random terms and an outcome of the application to at least one predetermined equation; verifying an integrity of the semi honest multiparty computation by comparison of the assignments to the at least one predetermined equation to at least one constant; and when the integrity is valid, combining the applications of the semi honest multiparty computations on the partial records.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: September 21, 2021
    Assignee: NEC Corporation Of America
    Inventors: Jun Furukawa, Kazuma Ohara, Toshinori Araki
  • Patent number: 11126864
    Abstract: A traffic guide object recognition device includes an imager configured to image surroundings of a vehicle and a recognizer configured to recognize surrounding circumstances of the vehicle. The recognizer selects a traffic guide object which the vehicle is to follow on the basis of forms of traffic guide objects in an image captured by the imager out of traffic guide objects which are provided near the vehicle.
    Type: Grant
    Filed: November 13, 2019
    Date of Patent: September 21, 2021
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Takayasu Kumano, Takuya Niioka, Kazuma Ohara, Suguru Yanagihara
  • Publication number: 20210231811
    Abstract: A recognition device includes: an acquirer configured to be connected to an object detection sensor which is mounted in a vehicle and is capable of changing a detection direction of each of upper, lower, right, and left directions and to acquire a detection result including 3-dimensional positional information regarding detection points from the object detection sensor; and a determiner configured to determine whether a point of interest among the detection points is a detection point at which a road surface is detected, based on a relation between the point of interest and a reference point at which a detection direction of the upper and lower directions is further downward than at the point of interest and configured to output a determination result.
    Type: Application
    Filed: January 12, 2021
    Publication date: July 29, 2021
    Inventor: Kazuma Ohara
  • Patent number: 11050745
    Abstract: An information processing apparatus that authenticates sets of distributed authentication information without collecting, the sets of distributed authentication information, to be collected at any one of apparatuses included in a system.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: June 29, 2021
    Assignee: NEC CORPORATION
    Inventors: Yuki Tanaka, Jun Furukawa, Kazuma Ohara, Toshinori Araki
  • Patent number: 11042358
    Abstract: A secure computation system is provided. The system includes a distribution information generation apparatus that generates data distribution values, sign distribution values and carry distribution values from at least two fixed-point numbers by distributing each of the at least two fixed-point numbers using an additive secret sharing scheme; and a secure computation apparatus group including at least two secure computation apparatuses. The secure computation apparatus group includes: a secure digit extender; and a secure multiplier.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: June 22, 2021
    Assignee: NEC CORPORATION
    Inventors: Toshinori Araki, Jun Furukawa, Kazuma Ohara, Haruna Higo
  • Publication number: 20210176252
    Abstract: A random number generation server device includes a random number generation unit generating random numbers, a share addition unit generating secret shared data masked using random numbers and the secret shared data of operands in secret equality determination, a secret shared data generation unit generating secret shared data of inputted values, a secret shared data restoration unit obtaining the original values by restoring the secret shared data, and a determination bit-conjunction unit using the secret shared data to perform secret equality determination. A mask value restoration server device includes a secret shared data generation unit, a secret shared data restoration unit, and a determination bit-conjunction unit. A secure computation server device includes a secret shared data generation unit, a secret shared data restoration unit, and a determination bit-conjunction unit.
    Type: Application
    Filed: December 5, 2017
    Publication date: June 10, 2021
    Applicant: NEC CORPORATION
    Inventors: Hikaru TSUCHIDA, Toshinori ARAKI, Kazuma OHARA
  • Publication number: 20210157955
    Abstract: The present invention provides a bit decomposition secure computation system comprising: a share value storage apparatus to store share values obtained by applying (2, 3) type RSS using modulo of power of 2 arithmetic; a decomposed share value storage apparatus to store a sequence of share values obtained by applying (2, 3) type RSS using modulo 2 arithmetic; and a bit decomposition secure computation apparatus that, with respect to sharing of a value w, r1, r2, and r3 satisfying w=r1+r2+r3 mod 2{circumflex over (?)}n, where {circumflex over (?)} is a power operator and n is a preset positive integer, being used as share information by the (2, 3) type RSS stored in the share value storage apparatus, includes: an addition sharing unit that sums two values out of r1, r2 and r3 by modulo 2{circumflex over (?)}n, generates and distributes a share value of the (2, 3) type RSS with respect to the sum; and a full adder secure computation unit that executes addition processing of the value generated by the addition s
    Type: Application
    Filed: May 18, 2017
    Publication date: May 27, 2021
    Applicants: NEC CORPORATION, BAR-ILAN UNIVERSITY
    Inventors: Toshinori ARAKI, Kazuma OHARA, Jun FURUKAWA, Lindell YEHUDA, Nof ARIEL