330results about How to "Realize privacy protection" patented technology

The invention discloses a personal data management method based on cloud computing environment. The method takes the server cluster of the cloud computer environment as a background server, a removable storage device as a client and a computer connected with the removable storage device as a host. The method comprises the following steps: the removable storage device is configured to be a disk which can be visited through a driver letter on the host, through the disk, documents are uploaded and downloaded to the background server, the disk is read and written and a green software is used, at the same time, in the document uploading and downloading and the disk reading and writing process, the data is encrypted and decrypted and the document of the background server is kept synchronous with document of the removable storage device client. The invention adopts the removable storage device as the storage client, the data on the removable storage device is encrypted, the green software can be used portably, no mark is left on the host, and the privacy protection of the user is realized. When the data is backed up, the data synchronism of the client and the background server is ensured.

The invention provides an efficient privacy protecting audit scheme based on the chameleon hash function of cloud storage. The scheme includes (1) a system initialization step; (2) a registration step; (3) a pseudo-random key pair and hash key generation step for data users; (4) a data label generation step; (5) a challenge step; (6) a proof step; (7) a validation step. According to the scheme, on the basis of the decidable Diffie-Hellman problem and a chameleon digital signature, a privacy protecting public audit scheme is established, and high efficiency, low safety assumptions and wide application range are provided; according to a cloud server, the identity privacy of the data users is protected, and the outsourcing data integrity is protected; according to auditors, the data user privacy is protected in the whole auditing process.

The invention belongs to the technical field of information, and particularly relates to a block chain contract privacy protection method and system based on attribute-based encryption. The system comprises a key distribution center KDC, a user and a block chain system. The key distribution center KDC is used for establishing an attribute-based encryption system supporting an attribute-based access strategy, user key distribution, public key management and authorization check and revocation. The whole block chain system adopts one attribute-based encryption system, and one key distribution center (KDC) is adopted to carry out key management. According to the method, the attribute-based encryption is adopted to realize privacy protection on sensitive information in a block chain contract; and the attribute key in the access control strategy can be dynamically generated and cancelled, and the contract party dynamically controls the access permission of the private data on the block chain.

The embodiment of the invention provides a block chain transaction settlement method and system and related equipment, which are used for realizing compatibility and transaction privacy protection ofvarious asset transactions on the same block chain. The method comprises steps that transaction information is acquired, the transaction information comprises an account transfer account, an account transfer amount, an account entry account and a target asset identifier, and the target asset identifier is one of multiple preset asset identifiers; whether the amount of the target asset corresponding to the target asset identifier in the transfer account is greater than the transfer amount or not is verified, and if so, privacy protection processing is performed on the transaction information togenerate private transaction data, so that the transaction information cannot be analyzed without private keys of both transaction parties; and the private transaction data is broadcast to a block chain for verification, and a transaction corresponding to the transaction information is executed after the verification is passed.

The invention relates to a blockchain-based smart city information safety using method and system. The blockchain-based smart city information safety using method according to the present invention includes the following steps: receiving a request for executing a smart contract from a user; searching for a data directory on a blockchain according to the smart contract request and obtaining a requested data address; obtain encrypted data from the requested data address, decrypting the encrypted data, encrypting the decrypted data with the secret key of a corresponding sandbox, and then sendingthe data to the corresponding sandbox; performing an smart contract operation by using the decrypted data, performing consensus calculation on an operation result and the operation results of other blockchain node sandboxes; after the consensus calculation is passed, sending a result to the user who issues the request for executing the smart contract. The blockchain-based smart city information safety using method realizes effective information sharing and sensitive information privacy protection among multiple physical organization in a smart city.

The invention relates to two systems which are an urban real-time traffic system capable of realizing privacy protection based on block chains of a public chain and an urban real-time traffic system capable of realizing vehicle monitoring based on block chains of a private chain. The urban real-time traffic system capable of realizing privacy protection based on the block chains of the public chain comprises a system center module, urban vehicles and a recorder module. The urban real-time traffic system capable of realizing vehicle monitoring based on the block chains of the private chain is additionally provided with a center which is responsible for managing identifiers of the vehicles. According to the invention, the block chain is adopted as a core technology, a record book of the block chain is utilized to store and record driving records of each automobile in a distributed manner, each automobile is recorded by adopting a mode of the automobile identifier in the record book, each identifier generates a random character string by adopting an encryption algorithm and varies in a timed manner, and privacy protection for an automobile owner or vehicle monitoring is realized according to the confidentiality of the identifiers. The recorder draws real-time traffic conditions according to data of the record book.

The invention discloses an on-line fingerprint authentication system and method based on bidirectional privacy protection. With the system and method, a problem that bidirectional privacy protection of fingerprint data of the user and fingerprint template data is not involved in the prior art can be solved. The system is composed of a trusted center (1), a fingerprint authentication server (2), and a user terminal (3). The trusted center (1) completes system initialization, provides registration and secret key distribution for a user terminal and the fingerprint authentication server, collects a user fingerprint as an authentication template, and gives authorization of the template to a legal fingerprint authentication server in a ciphertext mode; the fingerprint authentication server (2) provides an on-line encryption fingerprint authentication service with privacy protection and returns an authentication result to the user terminal; and the user terminal (3) sends an encrypted fingerprint authentication request to the fingerprint authentication server and decrypts the reply of the fingerprint authentication server to obtain an authentication result. According to the invention, bidirectional privacy protection of the user fingerprint data and the fingerprint template data is realized and a secure on-line fingerprint authentication service is provided.

The invention discloses a multifunctional fine-grained access control method for cloud storage, and solves the problem of fine-grained access control of data in cloud storage. The implementation stepsof the method are as follows: performing global initialization and attribute organization initialization; generating the public and private keys of a user and a private key of a cloud server; enabling a system to perform offline/online encryption, wherein the system is provided with a strategy hiding mechanism; uploading a final ciphertext to the cloud server; enabling the cloud server and a userterminal to decrypt and verify the correctness of the keys; enabling the cloud server to delete the corresponding entry from a key list for user revocation. The invention proposes a multi-system CP-ABE scheme with multiple characteristics, and the offline/online encryption mechanism is constructed in detail, which greatly reduces the computational cost of the user. The method has the functions ofattribute revocation, keyless collocation problem, the offline/online encryption mechanism, the strategy hiding and verifiability, and can be applied to fine-grained access control of data in cloud environments such as education, business and medical fields.

The invention discloses an epidemic infectious disease virus field visualization method based on space-time trajectory data. The method comprises the following steps: S1, airspread infectious diseaseurban diffusion modeling; s2, collecting, cleaning and processing space-time trajectory data and infection attack data of virus carrying crowds; s3, obtaining position semantic information of a viruscarrier; s4, calculating the virus distribution density by taking the virus carrier as the position center; s5, mapping the time, space and virus distribution density data of the virus carrying population; and S6, constructing an epidemic infectious disease virus field cloud platform based on temporal GIS. The invention further provides an epidemic infectious disease virus field visualization system based on the space-time trajectory data. According to the method, space-time trajectory data and infection attack data of virus carrying crowds are processed into a virus distribution density map with the virus carrier as the position center, spatial position semantic information is added and mapped to a temporal GIS, and an epidemic infectious disease virus field is visually processed.

The invention discloses a cloud storage oriented ciphertext full-text search method and system based on full homomorphic ciphers. The method comprises that a data owner uploads document IDs, encrypted document ciphertexts and an encrypted document inverse index table to a cloud server; hash operation is carried out to the document terms on the inverse index table; TF (Term frequency) and IDF (Inverse document frequency) values are encrypted by a full homomorphic technique on integers; a public key certificate is issued to a data user; the data user carries out hash operation to to-be queried keywords and uploads to a cloud service provider; the cloud service provider compares and searches the hash operation values of the to-be queried keywords and the hash operation values of the document terms on the inverse index table; and the cloud service provider carries out full homomorphic multiplication and add operations. According to the method and the system of the invention, the calculation is carried out in a ciphertext state; in the calculation process, any information related to the documents will not be leaked to the cloud service provider and other attackers; the data privacy of the data owner and the query data privacy of the data user are protected; and moreover, the controllability of the data right of use is realized.

The embodiment of the invention discloses a block chain encryption method based on a PKI (public key infrastructure)-CLC (certificateless cryptography) heterogeneous aggregation signcryption algorithm. The method comprises: generating, after a sender user ID and a sender user public key are obtained, a sender user private key by using an authentication center in the PKI according to the sender user ID and the sender user public key; generating, after a receiver user ID, a preset master secret key, a preset secret value, and a preset parameter, a receiver user private key by using a secret key generation center in the CPC according to the receiver user ID, the preset master secret key, the preset secret value, and the preset parameter; obtaining a transaction record plaintext, subjecting the sender user private key, the transaction record plaintext, and the preset parameter to signcryption to obtain a ciphertext; and subjecting the receiver user private key, the ciphertext, and the preset parameter to unsigncryption to obtain the transaction record plaintext.

The invention discloses an anonymous cross-domain recommendation method based on block chain technology, A technology base on block chain adopts heterogeneous multi-link data structure to carry out data storage, Users, merchandise and transaction relationship data are stored on users, merchants and platforms respectively. Transaction relationship does not store specific user and commodity information. Recommendation center can only obtain the relationship chain stored by each platform to ensure that an attacker cannot associate a user with a commodity. Aiming at the cold start problem caused by data sparseness, the invention performs data aggregation and similarity calculation based on accurate transaction data, and adopts a mixed recommendation strategy based on users and commodities to perform cross-platform recommendation, so as to achieve a safe and accurate win-win recommendation effect.

The invention relates to a distributed hash table (DHT) network-based anonymous communication method. With regard to three kinds of basic operations, including the resource publishing operation, the resource searching operation, and the resource transmission operation, of the traditional DHT network, a certain anonymous mechanism and security mechanism are introduced, thereby solving an anonymous communication problem in the DHT network. An anonymous mapping path is constructed at the resource publishing stage and a mapping node is determined, so that an anonymous base is provided for the resource publishing operation; a probabilistic forwarding strategy is used at the resource searching stage, so that the resource searching operation has the anonymous property; and at the resource loading and transmission stage, the mapping node is used as a relay node to carry out data transmission and combination with the session key encryption data is used, thereby guaranteeing the anonymous transmission and secure transmission of data. On the basis of combination of the three parts, sender anonymity, receiver anonymity, and communication relation anonymity are realized, thereby achieving objectives of user privacy protection and secure and stable operation of the whole DHT network.

The embodiment of the invention provides a Transaction method and device based on block chain and exporter equipment. The method comprises the following steps: calculating a transaction amount commitment, a first commitment random number ciphertext, a first transaction amount ciphertext, a second commitment random number ciphertext and a second transaction amount ciphertext; Submitting transactiondata to the block chain; Wherein the transaction data comprises the transaction amount commitment, the first commitment random number ciphertext, the first transaction amount ciphertext, the second commitment random number ciphertext and the second transaction amount ciphertext; And recording the transaction amount commitment, the first commitment random number ciphertext and the first transaction amount ciphertext into the remitter account, and recording the transaction amount commitment, the second commitment random number ciphertext and the second transaction amount ciphertext into the remitter account.

The invention discloses a method and a system for sharing an anonymous resource, which belong to the technical field of computer information. The method for sharing the resource comprises the following steps that: a resource provider initiates a resource publishing request to a resource management server; the resource management server performs an anonymous authentication on the request; the resource provider generates a resource acquisition strategy, uses the resource acquisition strategy as a cipher key to encrypt the resource, and sends the acquisition strategy and the encrypted resource to the resource management server; the resource management server stores a binary group and releases resource description information; a resource acquirer retrieves the resource description information and initiates a resource acquisition request; the resource management server performs the anonymous authentication on the resource acquirer; and the resource acquirer acquires and decrypts the resource after acquiring a strategy verification. The invention also discloses a system sharing the resource, which corresponds to the method. The method and the system can be used for computer information technical application such as network resource sharing and the like.

The invention discloses a blockchain-based electronic medical record sharing system with a privacy protection function and an application method, and the system comprises a medical management department, a medical institution and a medical service receiver, and achieves the operations of system initialization, registration, electronic medical record sharing and electronic medical record deletion.According to the invention, through a hidden authorization mechanism, the system achieves the privacy protection in the electronic medical record sharing process, and can achieve the electronic medical record sharing under two scenes: electronic medical record sharing among different doctors in the same hospital and electronic medical record sharing among different doctors in different hospitals;in the electronic medical record sharing process, a patient has complete control right on electronic medical records of the patient. In addition, after the electronic medical record exceeds the validity period, the local cloud and the blockchain of each medical institution delete the electronic medical record.

The invention discloses a vehicular ad hoc network group awareness data report duplication eliminating method. According to the method, through adoption of an ECC algorithm, secure and reliable task distribution is realized, a label part of a ciphertext is hidden in a communication process, and fog nodes detect awareness report uniqueness and does not detect specific content of reports, so the privacy protection in a data duplication eliminating process can be realized, and a data counterfeiting attack can be resisted. According to the method, in order to record vehicle contributions in a report duplication eliminating process, signature aggregation is supported through adoption of an improved multi-signature scheme based on identities. According to the scheme, an efficient and secure aggregation confirmation function can be realized, and moreover, vehicles making contributions to the group awareness reports also can be recorded.

The invention discloses a warrantable privacy protection space crowdsourcing task distribution system and method, and the system comprises an SC server, an encryption service provider, a space task requester, and workers. The encryption service provider generates a secret key, and employs a Paillier password and ElGamal password system. The space task requester creates a space task, and returns the position of the task to the SC server. The SC server encrypts the position of the task, and each worker calculates the distance between the position of the task and the position of the worker. The speed of each worker is encrypted and transmitted to the SC server, and each worker calculates the travel time of his own, and encrypts the travel time and transmits the encrypted travel time to the SC server. The SC server calculates the winning workers through the encryption service provider, and the encryption service provider enables the winning worker set comprising a plurality of winning workers to be encrypted and returned to the SC server. The SC server encrypts the position of the task, and broadcasts the encrypted position of the task to all workers, and the winning workers arrive at the specified position to execute the task. According to the invention, the system achieves the double-side privacy protection in the space crowdsourcing, greatly reduces the calculation, and can guarantee that the task is accepted at high probability.

The invention discloses a security enhancement method for a third-party code of an Android application program. The security enhancement method comprises the steps of: obtaining a call chain relating to user privacy data in an application program process by utilizing system exception stack data; obtaining main information of a call initiator by a system according to call chain information; sending the main information of the call initiator to a system access control evaluation engine by utilizing an inter-process communication mechanism; judging a call source by an evaluation engine according to the main information and a third-party code package list; executing a corresponding user policy according to the call source; performing permission evaluation of the call according to user selection and application program permission; caching an evaluation result; and returning corresponding data according to the evaluation result. The method is capable of realizing the security enhancement of the third-party code of the Android application program with relatively low performance cost on the basis of being compatible with an original application program structure and an original third-party code frame.