36 results about "Surrogate key" patented technology

The invention discloses a multi-dimensional OLAP (On Line Analytical Processing) inquiry processing method facing a column storage data warehouse. In the multi-dimensional OLAP inquiry processing method, the OLAP inquiry is decomposed into a bitmap filtering operation, a grouping operation and an aggregation operation. In the bitmap filtering operation, firstly, the predication is executed on a dimension table and a predicate vector bitmap is generated; and a connection operation is converted into a direct dimension table record access operation by surrogate key address mapping so as to implement access according to the positions. In the grouping operation, the pre-generation of grouping units is carried out on fact table records which meet the filtering conditions according to grouping attributes in an SQL (Structured Query Language) command and increasing IDs (identity) are distributed. In the aggregation operation, the grouping aggregation calculation which is carried out according to a grouping item of a grouping filtering vector of a fact table is implemented by carrying out column scanning on the metric attribute of the fact table for once. According to the invention, all OLAP processing tasks can be completed only by carrying out column scanning on the fact table for once, so that the cost of repeatedly scanning is avoided.

The invention solves issues that disadvantages of poor operability and difficulty for implementing undeniable characteristic of server exist in current technique. The disclosed method for proxy signature includes steps: initializing system parameters; based on system parameters to generate private key of proxy signer; original signer generates proxy key of proxy signer; proxy signer generates proxy signature for message; validating proxy signature. The invention also discloses a system of proxy signature. The system includes module for initializing system parameters, private key generation module, proxy key generation module, proxy signature generation module, module for validating signature, and module for picking up Id of proxy signer. The invention satisfies undeniable characteristic of server, protects proxy signer, and the security is based on RSA.

A Generic Authentication Architecture bootstrapping procedure is performed between a mobile terminal and a bootstrapping server function resulting in the mobile terminal and the bootstrapping server function each acquiring at least a bootstrapping transaction Identifier associated with the mobile terminal and a corresponding shared key. The mobile terminal derives a network application function specific key based on at least the acquired shared key and an identifier of said network application function. The bootstrapping transaction identifier and the network application function specific key are sent from the mobile terminal to the proxy mobile node. A request message for Mobile Internet Protocol registration is sent from the proxy mobile node to a home agent on behalf of the mobile terminal, the request message including the bootstrapping transaction identifier and an identifier of the proxy mobile node. The registration message is verified in the home agent with the use of a network application function specific key obtained from the bootstrapping server function or a network application function. The request message for Mobile Internet Protocol registration is authenticated with the proxy mobile node acting on behalf of the mobile terminal by verifying the message authentication code with the obtained network application function specific key.

The embodiment of the invention discloses a method, a device and a system for processing cipher text. The method comprises the following steps: selecting the random secret value by a cipher text transmitting terminal; calculating the key of the terminal according to the partial keys obtained by the terminal and the random secret value; calculating the proxy key according to the keys of the terminal and public keys published by a cipher text receiving terminal, wherein the public keys published by the cipher text receiving terminal are obtained through calculating by the cipher text receiving terminal according to the selected random secret value and public parameters of the system; and transmitting the proxy key so that the cipher text receiving terminal obtains the cipher text after being switched according to the cipher text transmitted to the cipher text transmitting terminal by the proxy key, and decrypts. After adopting the embodiment of the invention, the shortcoming of the cipher text re-encryption technology on collusion can be effectively prevented, and the safety of the information can be ensured. Simultaneously because of the realization of the invention, public key infrastructures (PKI) can be saved, and extensibility is better.

The invention relates to an OLAP grouping aggregation method based on a function dependency relationship. The method comprises following steps: a function dependency tree structure among grouping attributes is defined, and the function dependency relationship between the grouping attributes and attributes among tables is defined; the grouping attribute of the GROUP BY clause is detected according to the grouping attribute function dependency tree; a query grouping attribute is divided into two subgroups which are formed by function dependency key attributes and other grouping attributes respectively; mode resolution is performed on a dimension table according to the function dependency relationship, wherein the dimension table adopts surrogate key mechanism and memory column storage mechanism; under the mechanisms of dimension table mode resolution and surrogate key index, grouping aggregation calculation further converts the subgroup attributes into function dependency attributes; after the grouping aggregation calculation is completed, the function dependency attributes are directly mapped to a memory offset address of related dimension table records according to function dependency attribute values to complete the operation of extracting other related grouping attributes. By means of the method, the size of grouping attributes can be reduced, and the Hash grouping calculating efficiency is increased.

The invention discloses equipment for generating an inextensible unidirectional proxy re-encryption key. The equipment comprises a re-encryption key generating unit and a strengthening unit, wherein the re-encryption key generating unit is used for acquiring a private key pair (a1, a2) of an authoring part and a public key of an authorized part and generating a unidirectional proxy key according to one private key a1 in the private key pair of the authorizing part and the public key of the authorized part; and the strengthening unit is used for selecting an adjusting factor s, acquiring the public key h of the authorizing part, and generating the inextensible unidirectional proxy re-encryption key rka-b by introducing the selected adjusting factor s, the public key h of the authorizing part and the other private key a2 in the private key pair of the authorized part according to the generated unidirectional proxy re-encryption key. In addition, the invention also discloses a method for generating the inextensible unidirectional proxy re-encryption key, and a method and a system for executing inextensible unidirectional proxy re-encryption.

The invention relates to the technical field of mobile value-added services, in particular to an access control method for protecting access privacy of a user in a mobile value-added service system. The method comprises system initialization, role-based authorization, certification and secret key consultation, tracking of the user and revocation of a user role. A role management center is required to implement honestly the authorization of the agent key and the opening of the anonymity, in particular, the role management center can not forge request information of the mobile user and protects interest of the user, and besides, a service provider does not know personal preferences of legal users to the mobile value-added service, so that the requirement of the system is reduced, the legitimate interests of users are safeguarded, the privacy right of users is protected and the method is suitable for development requirements of existing value added services.

The subject disclosure pertains to databases as well as generation and utilization of keys. A desired or default number of values can be requested from a domain and allocated for use. These values can be utilized to generate surrogate keys. Subsequently or concurrently, the keys can be employed with respect to operations such as single pass loading of databases and/or data warehouses. Any unused keys can be returned and made available for use by other users or processes. Furthermore, the key generation functionality can be provided outside a database thereby relieving a database system of this burden.

The invention provides idealized and reusable data source interfaces. The process of idealizing includes reengineering of the original data model using a surrogate key based model. The technique emphasizes readability and performance of the resulting operational data store.

The invention provides a unique method for handling changes that allows all types of changes to be automatically implemented in the operational data store by table conversion.

Further the invention provides Inline materialization that supports a continuous data flow dependency chain. The continuous dependency chain is used to provide automated documentation as well as dynamic paralleled transformation process.

Finally master data integration is provided as a benefit of architecture and the inbuilt surrogate key based data model. The feature implements integrations by specification rather than by programming.

The invention relates to an anti-quantum computing proxy digital signature method and an anti-quantum computing proxy digital signature system based on an asymmetric key pool, and computer equipment.The anti-quantum computing proxy digital method comprises the steps that: an original signature party uses a signature private key of the original signature party to generate a proxy key, and transmits an original text to be signed, the proxy key and a public key pointer random number corresponding to a signature public key of the original signature party to a proxy signature party; the proxy signature party obtains the signature public key of the original signature party from a secret key card of the proxy signature party according to the public key pointer random number, and utilizing the signature public key to verify the proxy key; performing signature operation on the original text by utilizing the proxy key to generate a file signature by the proxy signature party after the verification passes, and transmitting the original text, the file signature and the public key pointer random number to a verification party; and the verification party obtains a signature public key of the original signature party from a secret key card of the verification party according to the public key pointer random number, and verifies file the signature by utilizing the signature public key.

The invention relates to a universally composable identity proxy signcryption method. The method includes the steps of system initialization, public and private key generation, proxy key generation, proxy signcryption, decryption, and verification. According to the universally composable identity proxy signcryption method, the public key of a user is determined according to the identity information of the user; and the private key of the user is generated through a private key generator. With the universally composable identity proxy signcryption method adopted, the problem of calculation costs for certificate generation, storage, distribution, revocation and verification of traditional public key infrastructure can be solved; with no secure channels required, confidentiality and authentication can be realized. The method of the invention has the advantages of universal composite security, low computational complexity, and the like, and is suitable for technical fields such as mobile agents and electronic conferences.

Provided is a general surrogate key generation method for an identity-based proxy cryptography method. The general surrogate key generation method can be applied to any known identity-based cryptography method. The general surrogate key generation method directly adopts a certificate of authorization as a surrogate public key. A Hash function is adopted to encrypt middle parameters. Various efficient identity-based proxy cryptography methods which are established by using the method of the invention can be widely applied to electronic commerce, mobile agents, distributed networks, etc., and greatly enhance the running efficiency and safety.

The invention discloses an atomic index storage method and system based on a bitmap summary model, and the method comprises the steps that a bitmap optimizer carries out grouping storage of proxy keydigital indexes of atomic indexes, and comprises an element group object and a bit set group object; a digital coding module performs digital coding on the atomic indexes to be stored to generate proxy key digital indexes and corresponding group numbers of the atomic indexes; and a matching storage module respectively matches the atomic indexes to be stored with the bit set group object and the element group object of the bitmap optimizer, and stores proxy key digital indexes of the atomic indexes. The number of data entries and the storage size can be reduced, and the aggregation query efficiency is improved.