Abstract: There is provided an information processing apparatus including a first computation protocol generation unit configured to generate a first computation protocol that does not include a confidentiality securing protocol that is executed in order to maintain confidentiality of a plurality of input values on the basis of a secure computation protocol in which a plurality of operation processing apparatuses compute an output value on the basis of the input values, and a second computation protocol generation unit configured to generate a second computation protocol by arranging the confidentiality securing protocol to a position at which the confidentiality is secured in the first computation protocol.

Abstract: There is provided an information processing apparatus including an information obtaining unit configured to obtain authentication validation information input to another apparatus from the another apparatus, and an authentication unit configured to, if the authentication validation information obtained by the information obtaining unit from the another apparatus matches authentication validation information managed by the information processing apparatus, perform an authentication process between the information processing apparatus and the another apparatus using the authentication information managed by the information processing apparatus.

Abstract: There is provided an information processing device including a query generation unit configured to generate, on the basis of a table in a database and any query with regard to the table, one or more different queries, and a table search unit configured to search for the number of tables that are different from the table and in which a result of the different query generated by the query generation unit is not in conflict with a result of the any query.

Abstract: Provided is an information processing apparatus including a sensor data obtaining unit configured to obtain predetermined information from a sensor, the sensor obtaining the predetermined information by sensing, and a key generation unit configured to generate key information for use in an authentication process, based on the information which is obtained by the sensor data obtaining unit during a predetermined period of time.

Abstract: There is provided an information processing apparatus including an authentication process unit configured to obtain an authentication request from another apparatus, and perform an authentication process between the information processing apparatus and the another apparatus in response to the authentication request, and a notification generation unit configured to, when the authentication process unit performs the authentication process between the information processing apparatus and the another apparatus, generate information for notifying a result of the authentication process and information for limiting use of the another apparatus.

Abstract: There is provided a communication device including an acceptation unit configured to accept a service execution request for requesting execution of a service, a control unit configured to specify a service providing device to which a request for execution of a service provided by the service providing device is made based on a device record that includes the service and provision destination group information that indicates a provision destination group of the service, and the service execution request accepted by the acceptation unit, a transmission unit configured to transmit the service execution request to the service providing device specified by the control unit.

Abstract: An authentication device includes circuitry that holds L (L?2) secret keys si (i=1 to L) and L public keys yi that satisfy yi=F(si) with respect to a set F of multivariate polynomials of n-th order (n?2). The circuitry also performs with a verifier, an interactive protocol for proving knowledge of (L?1) secret keys si that satisfy yi=F(si). The circuitry receives L challenges from the verifier, arbitrarily selects (L?1) challenges from the L challenges received. The circuitry also generates, by using the secret keys si, (L?1) responses respectively for the (L?1) challenges selected, and transmits the (L?1) responses generated.

Abstract: A signature verification apparatus including a signature acquisition unit configured to acquire a digital signature including first information generated based on a pair of multi-order multivariate polynomials F=(f1, . . . , fm) defined in a ring K, a signature key s which is an element of a set Kn, and a document M and a plurality of pieces of second information for verifying that the first information is generated using the signature key s based on the data M, the pair of multi-order multivariate polynomials F, and vectors y=(f1(s), . . . , fm(s)), and a signature verification unit configured to verify legitimacy of the document M by confirming whether or not the first information is restorable using the plurality of pieces of second information included in the digital signature. The pair of multivariate polynomials F and the vectors y are public keys.

Abstract: There is provided a print medium, whereon a public key used for authentication in a public-key authentication scheme is displayed as character information.

Abstract: There is provided a highly secure cryptographic processing apparatus and method where an analysis difficulty is increased. In a Feistel type common key block encrypting process in which an SPN type F function having a nonlinear conversion section and a linear conversion section is repeatedly executed a plurality of rounds. The linear conversion process of an F function corresponding to each of the plurality of rounds is performed as a linear conversion process which employs an MDS (Maximum Distance Separable) matrix, and a linear conversion process is carried out which employs a different MDS matrix at least at each of consecutive odd number rounds and consecutive even number rounds. This structure makes it possible to increase the minimum number (a robustness index against a differential attack in common key block encryption) of the active S box in the entire encrypting function.

Abstract: A miniaturized non-linear conversion unit is achieved. Included is an encryption processing part configured to divide and input configuration bits of data to be processed into a plurality of lines, and to repeatedly execute a data conversion processing applying a round function as to the data in each line, wherein the encryption processing part includes an F function executing unit configured to input one line of data configuring the plurality of lines, and to generate conversion data, wherein the F function executing unit includes a non-linear conversion processing unit configured to execute a non-linear conversion processing, and wherein the non-linear conversion processing unit includes a repeating structure of a non-linear calculation unit made up from either one NAND or NOR, and either one XOR or XNOR calculation unit, and a bit replacement unit. The miniaturized non-linear conversion unit is achieved by this repeating configuration.

Abstract: An authentication device includes circuitry that holds L (L?2) secret keys si (i=1 to L) and L public keys yi that satisfy yi=F(si) with respect to a set F of multivariate polynomials of n-th order (n?2). The circuitry also performs with a verifier, an interactive protocol for proving knowledge of (L?1) secret keys si that satisfy yi=F(si). The circuitry receives L challenges from the verifier, arbitrarily selects (L?1) challenges from the L challenges received. The circuitry also generates, by using the secret keys si, (L?1) responses respectively for the (L?1) challenges selected, and transmits the (L?1) responses generated.

Abstract: There is provided an information processing device including an information storage unit configured to store information about a state in which a first secret key used during authentication is held in devices, and information about connection between the devices, and a communication unit configured to send the first secret key so that the first secret key is delivered to the devices based on the information stored in the information storage unit.

Abstract: A cryptographic processing unit divides and inputs constituent bits of data to be subjected to data processing to lines, and repeatedly performs a data converting operation using round functions on the data of the respective lines. The cryptographic processing unit inputs n/d-bit data obtained by dividing n-bit data as input data by a division number d to each line, and repeatedly performs a round calculation including a data converting operation using round functions. The n/d-bit data in each line having output data of the round calculations is divided into d/2 sets of data, and the divided data are combined to restructure d sets of n/d-bit data that are different from the output data of the round calculations of the previous stage. The restructured data is set as input data for round calculations of the next stage. The cryptographic processing realizes improved diffusion properties and a high level of security.

Abstract: Provided is an authentication device including a key setting unit for setting s?Kn to a secret key and setting a multi-order polynomial fi(xl, . . . , xn) (i=1 to m) on a ring K and yi=fi(s) to a public key, a message transmission unit for transmitting a message c to a verifier, a verification pattern reception unit for receiving information on one verification pattern selected by the verifier from k (k?3) verification patterns for one message c, and a response transmission unit for transmitting, to the verifier, response information, among k types of response information, corresponding to the information on the verification pattern received by the verification pattern reception unit, where the response information is information that enables calculation of the secret key s in a case all of the k verification patterns for the message c performed by using the k types of response information have been successful.

Abstract: Provided is an information processing apparatus including a number acquisition unit configured to acquire a number used for a coefficient of each term constituting a set of a multi-order multivariate polynomial F=(f1, . . . , fm), the number generated using a predetermined function from information shared between entities that execute an algorithm of a public-key authentication scheme or a digital signature scheme that uses a public key including the set of the multi-order multivariate polynomial F, and a polynomial calculation unit configured to calculate a multi-order multivariate polynomial for an input value of a variable by allocating the number acquired by the number acquisition unit to coefficients of the multi-order multivariate that includes the set of the multi-order multivariate polynomial F as a structural element.

Abstract: Provided is an information processing apparatus including a number acquisition unit configured to acquire a number used for a coefficient of each term constituting a set of a multi-order multivariate polynomial F=(f1, . . .

Abstract: An information processing apparatus that controls a display to display a first user interface including a first input field configured to receive identification information and a second input field configured to receive a public key; and controls transmitting identification information received at the first input field and a public key received at the second input field to another information processing apparatus for registration at the another information processing apparatus.

Abstract: Provided is An information processing apparatus including a processing unit configured to transmit commitment information including identification information on a verification processing apparatus to the verification processing apparatus, generate response information used for the verification processing apparatus to execute a process related to verification based on challenge information transmitted from the verification processing apparatus, and transmit the response information to the verification processing apparatus or configured to transmit the commitment information to the verification processing apparatus, generate second challenge information including the identification information based on first challenge information transmitted from the verification processing apparatus, generate the response information based on the generated second challenge information, and transmit the response information to the verification processing apparatus.

Abstract: There is realized a data conversion device that performs generation of a hash value with improved analysis resistance and a high degree of safety. There are provided a stirring processing section performing a data stirring process on input data; and a compression processing section performing a data compression process on input data including data segments which are divisions of message data, the message data being a target of a data conversion. Part of multi-stage compression subsections is configured to perform a data compression process based on both of output of the stirring processing section and the data segments in the message data. There is provided such a configuration that the stirring process is executed at least on fixed timing of a compression processing round of plural rounds and thus, there is realized a data conversion device that performs generation of a hash value with improved analysis resistance and a high degree of safety.