Abstract: According to one embodiment, an anonymization apparatus according to an embodiment is configured to execute a determination process, a division process, and a process of recursively executing at least the determination process and the division process, and to thereafter execute anonymization. A number-of-kinds calculation circuit calculates a number of kinds of different attribute values for each of a plurality of attributes, before the determination process is executed. A determination circuit determines the attribute to be noticed, based on also the calculated number of kinds. A sort circuit sorts a plurality of personal data items, based on the calculated number of kinds, before the division process is executed.

Abstract: A data management device according to an embodiment stores first encrypted data obtained by encrypting plain text data with a first public key of a first user device. The data management device stores a first re-encryption key for re-encrypting the first encrypted data without decrypting to obtain first re-encrypted data decryptable with a private key of a second user device. The data management device stores a conversion key generated from a first private key corresponding to the first public key and a second private key of the first user device. The data management device converts the first encrypted data into second encrypted data with the conversion key. The data management device The data management device converts the first re-encryption key into a second re-encryption key with the conversion key.

Abstract: An anonymization indicator computation system of the embodiment includes a data storing device, an anonymization device, an anonymization degree computation device, and an addition degree computation device. The data storing device stores original data including a value for each item for each person. The anonymization device generates anonymized data from the original data by anonymizing values of part of items in the original data. The anonymization degree computation device computes the anonymization degree indicating a degree of anonymizing data based on the anonymized data. The addition degree computation device computes the data addition degree indicative of a probability of generating the anonymized data from the original data.

Abstract: According to one embodiment, an encryption device encrypts each of numerical values based on an encryption key, and generates encrypted data. On the basis of each of the encrypted data, a computation device generates a primary computation result corresponding to data in which a computation result of an expression that has added and subtracted each of the numerical values is encrypted. On the basis of the primary computation result, a secondary computation key and random numbers, a computation assist device generates a secondary computation result. The computation device generates a tertiary computation result based on the secondary computation result and a tertiary computation key, and decides the magnitude relation between a minuend and a subtrahend in the expression based on the tertiary computation result.

Abstract: According to one embodiment, a secret sharing system of an embodiment includes a secret sharing apparatus, a plurality of first storage server apparatuses, and at least one second storage server apparatus. Upon reception of a delete request transmitted from the secret sharing apparatus, each first storage server apparatus reads out, based on name information in the received delete request, storage position information associated with the name information from storage position information storing unit. Each first storage server apparatus deletes all of share information and copy information indicated by name information in the received delete request based on the readout storage position information.

Abstract: In an embodiment, regarding an addition of a kb-bit number A and a b-bit random number r, element data of a pre-calculated table C? is set based on a sum AH+rH of a value AH of upper b/2 bits of a number A2, which is lower b bits of the number A, and a value rH of upper b/2 bits of the random number r and the sum AL+rL of a value AL of lower b/2 bits of the number A2 and a value rL of lower b/2 bits of the random number r in such a way that presence/absence of carrying-over of A2+r is indicated. Accordingly, the size of the pre-calculated table needed to be reduced for obtaining an addition result of upper (k?1)b bits by mutually adding the kb-bit number A and the b-bit number r.

Abstract: According to one embodiment, a secret sharing system of an embodiment includes a secret sharing apparatus, a plurality of first storage server apparatuses, and at least one second storage server apparatus. Upon reception of a delete request transmitted from the secret sharing apparatus, each first storage server apparatus reads out, based on name information in the received delete request, storage position information associated with the name information from storage position information storing unit. Each first storage server apparatus deletes all of share information and copy information indicated by name information in the received delete request based on the readout storage position information.

Abstract: In a security countermeasure function evaluation apparatus, an estimator operates an input unit, whereby an evaluation point calculation unit makes an evaluation as to whether each item of countermeasure information representing a security countermeasure function in detail satisfies each item of sufficient condition table information, and the evaluation point is calculated from the evaluation result of each item, whereby the transition probability calculation unit calculates a transition probability based on the evaluation point.

Abstract: In an embodiment, regarding an addition of a kb-bit number A and a b-bit random number r, element data of a pre-calculated table C? is set based on a sum AH+rH of a value AH of upper b/2 bits of a number A2, which is lower b bits of the number A, and a value rH of upper b/2 bits of the random number r and the sum AL+rL of a value AL of lower b/2 bits of the number A2 and a value rL of lower b/2 bits of the random number r in such a way that presence/absence of carrying-over of A2+r is indicated. Accordingly, the size of the pre-calculated table needed to be reduced for obtaining an addition result of upper (k?1)b bits by mutually adding the kb-bit number A and the b-bit number r.

Abstract: In a security countermeasure function evaluation apparatus, an estimator operates an input unit, whereby an evaluation point calculation unit makes an evaluation as to whether each item of countermeasure information representing a security countermeasure function in detail satisfies each item of sufficient condition table information, and the evaluation point is calculated from the evaluation result of each item, whereby the transition probability calculation unit calculates a transition probability based on the evaluation point.

Abstract: The present invention relates to a cursor control device for controlling the display position of a cursor displayed on a display device. The cursor displayed on the display device is remotely controlled by a remote control transmitter. The remote control transmitter is provided with, for example, a light emitting element emitting light rays having a particular wavelength, for example, infrared rays. The position of the remote control transmitter is detected by an imaging device including a CCD. The position of the cursor on a display screen of the display device is controlled on the basis of the detected position of the remote control transmitter.