摘要:
A secret communication and authentication scheme based on a public key cryptosystem in which a decryption speed is improved while maintaining a security level. In the RSA type secret communication, a plaintext is expressed in a form of a k-digit base n number and a ciphertext is obtained by applying a calculation using the first public key n and the second public key e to the base n number and transmitted. Then, from the received ciphertext, a lowest digit of the base n number is decrypted by using the first public key n and the second secret key d, upper digits of the base n number are sequentially decrypted by using a decrypted value of the lowest digit of the base n number at the receiver side, and the plaintext is recovered by using decrypted values of respective digits of the base n number. The Rabin type secret communication can also be realized by the similar scheme. Moreover, the same principle of the base n pubic key cryptosystem can also be used in realizing the RSA type or the Rabin type Authentication.
摘要:
A new scheme for fast realization of encryption, decryption and authentication which can overcome the problems of the RSA cryptosystem is disclosed. The encryption obtains a ciphertext C from a plaintext M according to C≡Me (mod n) using a first secret key given by N (≧2) prime numbers p1, p2, . . . , pN, a first public key n given by a product p1k1 p2k2 . . . pNkN where k1, k2, . . . , kN are arbitrary positive integers, a second public key e and a second secret key d which satisfy ed≡1 (mod L) where L is a least common multiple of p1−1, p2−1, . . . , pN−1. The decryption recovers the plaintext M by obtaining residues Mp1k1, Mp2k2, . . . , MpNkN modulo p1k1, p2k2, . . . , pNkN, respectively, of the plaintext M using a prescribed loop calculation with respect to the first secret key p1, p2, . . . , pN, and by applying the Chinese remainder theorem to the residues Mp1k1, Mp2k2, . . . , MpNkN. This encryption/decryption scheme can be utilized for realizing the authentication.
摘要:
Disclosed is an information processing apparatus including: a learning unit that learns user preference for each type in each category for classifying content items in a server; a selection unit that, based on type information indicating a recommendable type which is a type of content items recommendable by the server and a substitutable type which is a type that satisfies a predetermined condition out of the recommendable type, selects one or more recommendable types in a case where there is the recommendable type corresponding with user preference in the selected category, and selects one or more substitutable types in the selected category in a case where there is no recommendable type corresponding with user preference; and an obtaining unit that obtains a content of the selected type from the server.
摘要:
An apparatus and a method for performing a hyperelliptic curve cryptography process at a high speed in a highly secure manner are provided. A base point D is produced such that the base point D and one or more of precalculated data in addition to the base point used in a scalar multiplication operation based on a window algorithm are degenerate divisors with a weight smaller than genus g of a hyperelliptic curve. An addition operation included in the scalar multiplication operation based on the window algorithm is accomplished by performing an addition operation of adding a degenerate divisor and a non-degenerate divisor, whereby a high-speed operation is achieved without causing degradation in security against key analysis attacks such as SPA.
摘要:
A recording and reproducing apparatus includes: a broadcast data holding unit that holds recorded broadcast data; a music data detecting unit that detects a start time and an end time of music data included in the broadcast data; a first song information acquiring unit that acquires first song information concerning the music data on the basis of the music data; an association information creating unit that creates information in which the music data, the broadcast data from the start time to the end time of the music data, and the first song information are associated with one another; and an association information holding unit that holds the information.
摘要:
The method comprises three stages. In the first stage, randomly selected point representations are stored in variables. In the second stage, a right-to-left loop is executed that modifies the variable values in dependency of a multiplier. In the last stage, the result is calculated from the modified variable values.
摘要:
An elliptic curve multiplication method comprises three stages. In the first stage, randomly selected point representations are stored in variables. In the second stage, a right-to-left loop is executed that modifies the variable values in dependency of a multiplier. In the last stage, the result is calculated from the modified variable values.
摘要:
A media-personality information acquiring apparatus includes a program keyword acquiring unit configured to acquire keywords contained in information on a program as program keywords, a program genre determining unit configured to determine whether or not a genre of the program is a predetermined genre, a caption keyword acquiring unit configured to acquire keywords contained in captions of the program as caption keywords when the program genre is the predetermined genre, and a media personality information generating unit configured to generate information on media personalities in the program on the basis of the program keywords or the caption keywords.
摘要:
An efficient undeniable digital signature scheme based on a quadratic field is disclosed. Public keys (D, P, k, t) and secret keys (D1, q) are defined by generating two primes p, q (p, q>4, p=3 mod 4, √{square root over (p/3)}
摘要:
An arithmetic processing device for inter-object data communication has an object manager for connecting objects so as to enable exchange of data between the objects, and a connection data supplying unit for supplying the object manager with connection data necessary for achieving the connection between the objects. Disclosed also are an inter-object communication method and a robot incorporating the arithmetic processing device. The robot may be designed to enable a user to replace parts thereof, thus changing the robot configuration. The robot preferably includes a part detection unit for detecting parts attached to the robot, and outputting a part detection result in accordance with the detection. An information storage unit stores information corresponding to the part detection result for each configuration obtained by replacement of the parts. A software changing unit revises robot-controlling software in correspondence with a changed configuration, based on a comparison of the part detection result with the information stored in the information storage unit. A controller controls general robot operations in accordance with the revised software.