97results about How to "Improve decryption efficiency" patented technology

The invention provides a distributed access control method for attribute-based encryption, and mainly aims to solve the problems of security and privacy protection of massive data in a cloud environment. A multi-authority ciphertext-policy attribute-based encryption (CP-ABE) mechanism is provided on the basis of CP-ABE. According to the mechanism, the workload of a single authority is shared with a plurality of authorities, and efficient outsourcing decryption, user revocation and dynamic join and exit supporting attribute authority (AA) can be realized. Through adoption of an access control mechanism provided by the invention, efficient, distributed, extensible and fine-granularity access control can be realized while the security and privacy of the massive data are protected.

The invention belongs to the technical field of wireless communication networks, and discloses an access control system and method supporting cross-domain data sharing, and a wireless communication system. Users needing to share data in a domain A select elliptic curve parameters to generate ECC key pairs; a global authentication center CA of the domain B generates a global public parameter; the proxy node in the domain B encrypts the system public key and the attribute set by using the ECC public key of the domain A user; the domain A user decrypts the data from the domain B by using the ECCprivate key of the domain A user and uploads the data to the public cloud; the legal user sends a file access request to the public cloud; and when user revocation occurs, the proxy server searches acorresponding attribute private key list according to the global identifier of the user and deletes the attribute private key list. The method is high in safety under the condition of the same secretkey length. The method gives full play to the characteristic of strong computing power of agent nodes, completes the preprocessing of some data, helps a user to carry out partial decryption, and improves the decryption efficiency of the user.

The invention relates to data safety technology, and particularly discloses a method and a system for remote bid opening and bid evaluation. The method includes the steps: uploading bidding documents, primarily encrypting the bidding documents and secondarily encrypting a primary encryption key; receiving and decrypting the bidding documents in an online manner, decrypting the primary encryption key by acquiring a secondary primary encryption key, and then decrypting the bidding documents by the aid of the primary encryption key; verifying validity of the bidding documents and generating a bid opening list when bid opening time comes; distributing bid inviting documents, the bidding documents and bid opening process documents; and performing evaluation according to preset evaluation standards to obtain bid evaluation results. The system comprises a bidding service subsystem, a bid opening service subsystem and a bid evaluation service subsystem, wherein the bid opening service subsystem is capable of decrypting the secondarily encrypted bidding documents in the online manner and providing the corresponding bid inviting documents, the bidding documents and the bid opening process documents to the bid evaluation service subsystem for evaluation. By the aid of the method and the system, safety of the bidding documents is facilitated, and decrypting efficiency is improved.

The invention relates to a computer information security technology, and particularly discloses a remote-authorization-based bidding document encryption and decryption method, which comprises the following steps that: an encryptor primarily encrypts a bidding document; the encryptor secondarily encrypts a primary encryption key; the encryptor transmits the primarily encrypted bidding document to a decryptor; the encryptor transmits the primary encryption key decrypted by a secondary encryption key to the decryptor when specified time is reached; and the decryptor decrypts the bidding document according to the decrypted primary encryption symmetric key. The encryption key is secondarily encrypted when the bidding document is primarily encrypted, so that the remote authorization decryption of the bidding document can be facilitated, the security of the bidding document can be ensured, and the decryption efficiency of the bidding document can be improved.

The invention particularly relates to a BGN type cryptograph decryption outsourcing scheme based on attributes. The scheme comprises steps that (1), a system parameter is set, and an encryption secret key is generated; (2), an access structure is selected by a sending side, message encryption is carried out, and cryptograph is generated; (3), a main secret key and the attributes are inputted by a receiving side, and a conversion secret key and a private secret key are outputted; (4), the cryptograph is sent by the sending side to a cloud end; (5), the conversion secret key is sent to the cloud end by the receiving side; (6), the cryptograph is converted by the cloud end through utilizing the conversion secret key to acquire a part of the cryptograph which is sent to the receiving side; and (7), the private secret key is utilized by the receiving side to decrypt the part of the cryptograph to acquire a message, and homomorphic computation operation for the cryptograph carried out by the cloud end is further comprised between the step (4) and the step (5). The scheme is advantaged in that not only can system decryption efficiency be improved, but also storage cost of a receiver is reduced; according to the cryptograph acquired according to the encryption method, a server is permitted to carry out multiple addition homomorphic operation and multiplication homomorphic operation for cryptograph data, on the condition that decryption difficulty does not increase, CPA safety of the user information is substantially improved.

The invention relates to a method for scheduling decryption machines. The method comprises: step 1, a receiver receiving invoice data information comprising invoice ciphertexts; step 2, the receiver querying the working state table of the decryption machines, determining whether there are decryption machines at idle working states, and if there are such idle decryption machines, selecting one as a specified decryption machine, wherein the decryption machine working state table comprises the working states of all the decryption machines, and the working states of the decryption machines comprise an idle state and a busy state; step 3, the server sending the invoice ciphertexts to the specified decryption machine and changes the working state of the specified decryption machine from the idle state to the busy state in the decryption machine working state table; step 4, the specified decryption machine decrypting the invoice ciphertexts and sending obtained invoice decryption information to the server; and step 5, the server, after receiving the invoice decryption information, changes the working state of the specified decryption machine from the busy state to the idle state in the decryption machine working state table. By using the method provided by the invention, the utilization efficiency of the decryption machines can be enhanced and the decryption efficiency can be improved.

The embodiment of the present invention discloses a file decryption method and device. The key used for decryption is pre-stored in the key set configured by the decryption server. When performing batch file decryption in the bid opening link, the decryption server can The file identification of the file, the key of the file to be decrypted is retrieved from the key set, and the file to be decrypted is decrypted, so that the decryption of the file in the bid opening link no longer depends on the participation of the client, and is directly performed by the decryption server Unified file decryption greatly improves the efficiency of file decryption in the bid opening process.

The invention discloses a decryption method for a TTS signature, comprising steps of obtaining a calculation formula in the TTS signature algorithm, successively choosing numerical values in a set as private key sampling values in the calculation formula, successively choosing the numerical value from the set as an input value of the calculation formula to perform operation when each private key sampling value is chosen so as to obtain the power consumption curve generated during the operation process, wherein the set is ((00...0)2, (00...1)2, ...,(11...1)2), and adopting a differential energy attack method based on a Hamming distance model to perform analysis on the power consumption curve to obtain the private key in the TTS signature algorithm. The embodiment of the invention can improve the decryption efficiency of the TTS signature.

The invention discloses a color image quick encryption method implemented on the basis of Arnold transform. The method includes the steps that an image is chunked according to the size of the image before encryption, then positions and gray levels of three primary color components of an image pixel are scrambled at the same time by means of Arnold transform to achieve encryption of the color image, and inverse transformation is carried out on transform in the preceding steps to decrypt the encrypted image. Through improvement of the prior art, the encryption effect is improved, encryption efficiency is improved, and the application range is widened.

The invention discloses an aggregation method for multi-dimensional data encryption and decryption in an intelligent power grid. The aggregation method comprises the following steps: 1, respectively generating an encrypted public key and a decrypted private key of power utilization data by utilizing a Chinese remainder theorem; 2, generating a public key and a private key of the password system; 3, encrypting the power utilization data; 4, respectively aggregating the ciphertext and the ciphertext decryption parameters; 5, decrypting the aggregated ciphertext; 6, solving a discrete logarithm for the intermediate ciphertext; and 7, decrypting the mixed ciphertext. In the key generation process, the encrypted public key and the decrypted private key of the power consumption data are generated by utilizing the Chinese remainder theorem, so that the key generation efficiency is improved, and the calculation burden of a control center and the risk of data leakage are reduced. In the decryption process, only one discrete logarithm needs to be obtained for the intermediate ciphertext, the decryption efficiency of the aggregated ciphertext is improved, and finally the efficiency of the whole data aggregation process is improved.

The invention discloses a slice file encryption method, a slice file decryption method, a storage medium and electronic equipment. The slice file encryption method comprises the following steps: acquiring password data and file data; performing algorithm operation on the password data to generate character string data; and segmenting the file data according to the character string data to form multiple pieces of file slice data, and sorting and combining the multiple pieces of file slice data according to the character string data to form encrypted file data. The character string data is generated by performing algorithm operation on the password data, and the file data is segmented, sorted and recombined according to the character string data so as to form the encrypted file data, so that only algorithm operation is required to be performed on the password data, encryption algorithm operation is not required to be performed on the whole file data, and the encryption efficiency is improved.

The invention discloses a statistics and analysis method and a statistics and analysis device for computer passwords. The method comprises the following steps: dividing the computer passwords in a password library into multiple groups according to the digits of the computer passwords; carrying out statistics and analysis on the password quantity corresponding to each regular expression in each group of computer passwords according to the preset regular expressions; sorting the regular expressions of each group of computer passwords according to the password quantity corresponding to each regular expression to obtain the statistics and analysis result of the computer passwords. According to the statistics and analysis method and the statistics and analysis device, the regular expressions sorted according to the statistical quantity of the computer passwords can be obtained by grouping the computer passwords and carrying out statistics and analysis on each group of passwords through the regular expressions, so that the hit rate of decrypting the computer passwords is improved; and analysis operation on a large-scale password library is supported.