Kabushiki Kaisha Toshiba

Kenichiro Furuta

Taichi Isogai

Yoshikazu Hanatani

Hirofumi Muratani

Yuichi Komano

Tomoko Yonemura

Kenji Ohkuma

Atsushi Shimbo

Hanae Ikeda

Satoshi Ito

Hiroshi Isozaki

Haruhiko Toyama

Hideyuki Aisu

Shinji Yamanaka

Tomoshi Otsuki

Masatake Sakuma

Toshiaki Asano

An example information processing device includes first and second receiving units, a deciding unit, and first and second transmitting units. The first receiving unit receives adjustment limit information from a plurality of first external devices. The deciding unit determines adjustment rules on the basis of the adjustment limit information. The first transmitting unit transmits the adjustment rules to second and third external devices. The second receiving unit receives determination information from a fourth external device. The second transmitting unit transmits the adjustment rules to the first external devices when integrated schedule information satisfies a condition. When the integrated schedule information does not satisfy the condition, the deciding unit changes the adjustment rules. When the deciding unit has changed the adjustment rules, the first transmitting unit transmits new adjustment rules to the second and third external devices.

Information processing device and power use adjustment system

An arithmetic device includes an input unit inputting data that are elements of a group; a converting unit is configured, when the input data are in a second representation, to convert the input data into a first representation and to perform arithmetic operation on the converted first representation using an operand in the first representation in which at least one subcomponent is a zero element to convert the converted first representation into first converted data expressed in the first representation, and when the input data are in the first representation, to perform arithmetic operation on the input data using the operand in the first representation in which at least one subcomponent is a zero element to convert the input data into second converted data expressed in the first representation; and an operating unit that performs arithmetic processing on the first or the second converted data using secret information.

Arithmetic device, method, and program product

According to one embodiment, a representation converting unit converts a set of n elements (h, h, . . . , h) (h: a member of a finite field F, 0&#x2266;i&#x2266;n&#x2212;1) that is a projective representation of a member g of an n-th degree algebraic torus T(F) (n: positive integer, p: prime number, m: positive integer) into a limited projected representation expressed by a set of n elements (h', h&#x2032;, . . . , h&#x2032;) (h&#x2032;: a member of the finite field F, 0&#x2266;i&#x2266;n&#x2212;1) in which at least one element out of the n elements is a zero element 0 or an identity element 1. An arithmetic unit omits part of Foperation that is arithmetic operation in the finite field Fbased on a fact that an element in the set of n elements (h&#x2032;, h&#x2032;, . . . , h&#x2032;) represented by the limited projective representation is a zero element '0' or an identity element '1' when performing Foperation that is arithmetic operation of a finite field Fin combination with the Foperation.

Arithmetic device

According to an embodiment, an authority changing device includes a first determiner, a second determiner, and a changing unit. A first authority is defined by a first combination of first to third item values, and a second authority is defined by a second combination of the fourth to sixth item values. The first determiner uses a logical expression to determine whether the change from the first authority to the second authority is possible, not possible, or unknown. The second determiner uses a first table to determine the availability of change from the first authority to the second authority when the availability of the change is determined to be unknown. The changing unit changes the first authority to the second authority when the change is determined to be possible.

Authority changing device, generating device, and computer program product

A compressing unit compresses an element on an algebraic torus into affine representation according to a compression map. A determining unit determines whether a target element on the algebraic torus to be compressed is an exceptional point representing an element on the algebraic torus that cannot be compressed by the compression map. The compressing unit generates, when it is determined that the target element is the exceptional point, a processing result including exceptional information indicating that the target element is the exceptional point, and generates, when it is determined that the target element is not the exceptional point, a processing result including affine representation obtained by compressing the target element according to the compression map.

Apparatus for performing data compression processing using algebraic torus

In a computing device that calculates a square of an element in a finite field, a vector representation of the element in the finite field is accepted. The vector representation includes a plurality of elements. The computing device performs a multiplication operation on a base field using the accepted elements, and obtains a multiplication value. The multiplication operation is determined by a condition under which the element in the finite field is placed in an algebraic torus. The computing device performs an addition and subtraction operation using the obtained multiplication value and the accepted elements, and obtains a calculation result of the square of the element. The addition and subtraction operation is determined by the condition. The computing device then outputs the calculation result.

Exponentiation calculation apparatus and method for calculating square root in finite extension field

When converting an affine representation representing a 2r-th degree algebraic torus T(F) (r is a prime number, and q is an integer) to a projective representation representing a quadratic algebraic torus T(F), a representation converting apparatus acquires member (c, c, . . . , c), (cis a member of a finite field F, where 0&#x2266;i&#x2266;r&#x2212;2) of a 2r-th degree algebraic torus T(F) represented by the affine representation. The apparatus performs a multiplication operation on the acquired member. The multiplication operation is determined by a condition under which a member of a quadratic algebraic torus T(F) is included in the 2r-th degree algebraic torus T(F), a modulus and a base of a quadratic extension, and a modulus and a base of an r-th degree extension. The representation converting apparatus then performs an addition and subtraction operation determined by the condition, the moduli, and the bases.

Representation converting apparatus, arithmetic apparatus, representation converting method, and computer program product

An encryption processing unit executes an arithmetic operation decided in advance and outputs an arithmetic result as an element on an algebraic torus. A compressing unit outputs, when the arithmetic result is an exceptional point representing an element on the algebraic torus that cannot be compressed by a compression map for compressing an element on the algebraic torus into affine representation, a compression result obtained by compressing the arithmetic result according to the compression map and outputs, when the arithmetic result is the exceptional point, an element belonging to a specific set decided in advance that does not overlap a set to which a compression result obtained by compressing the arithmetic result, which is not the exceptional point, belongs.

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Tokyo, Japan

Kenichiro Furuta