47results about How to "Guaranteed unforgeability" patented technology

The invention discloses an attribute-based anonymous authentication method which contains the following steps: 1) a trusted party TP generates a master key x and system public parameters according to set safety parameters; 2) a user U registers with the TP to submit attributes and initiates an attribute certificate issue request; 3) the TP verifies the attributes of the user U and issues an attribute certificate for the user U according to the attributes of the U, the master key x and the system public parameters; 4) the user U initiates an access request to a service provider SP; 5) the SP looks up an access strategy corresponding to the access request and returns the access strategy to the user U; 6) the user U selects an attributes that the U wants to use according to the access strategy, and an anonymous certificate is calculated by the use of the attribute certificate and a private key r and is sent to the SP; and 7) the SP verifies the anonymous certificate, and accepts the access request and provides corresponding service to the user if verification is passed and the access strategy is satisfied. According to the invention, privacy of a user is guaranteed, and a more flexible threshold attribute selective showing scheme is supported.

The invention provides a lightweight digital signature method based on a translog problem, belonging to the fields of cryptographic technology and computer technology. The method comprises three parts, i.e. secret key generation, digital signature and authentication. A sending user in the method has two secret keys, i.e. a private key and a public key, wherein the private key cannot be deduced from the public key; the private key of the sending part is used to generate a name guide of a message; and the public key of the sending part is used for a receiving part to verify the name guide of the corresponding message. With the method provided by the invention, the attack of the existing analysis method can be effectively resisted. The method has the advantages of high calculation speed and the like, the modular length is less than 96 bits, and the technology can be published; and the method can be applied to the signature and the verification of any message in mobiles, computers and communication networks, also can be used for identity authentication and content confirmation in electronic banking, e-commerce and e-government affairs, and can be used for the anti-counterfeiting of bills, certificates and high order goods.

The invention discloses a safe and efficient SM9 ring signature generation and verification method, including a key generation center KGC, a signer Signer, and a verifier Verifier, wherein the KGC is responsible for generating the user private key of the signing user in the system; The number of users is n, and the signer is the πth user in the user group; the method includes the following steps: 1) generating a ring signature for the message M; 2) verifying the validity of the signature obtained in step 1), and judging the signature Whether the user is an in-ring user. The invention provides a ring signature generation and verification scheme based on the SM9 digital signature algorithm, which ensures the unforgeability of the signature and the anonymity of the signer. The scheme ensures the spontaneity of the signer to generate user groups without the cooperation of other users. The invention adopts an accumulative structure to realize the ring signature, so that the number of bilinear pairings performed by the signature generation and verification algorithm is greatly reduced, and the efficiency of the signature and verification operation is effectively improved.

The invention discloses a blockchain-based distributed trusted network connection method. To solve the problem that the distributed network access control framework cannot be provided in the existing trusted network connection, the implementation plan is: in the initialization stage, the terminal device registers and sends the information; the trusted third party verifies the registration information; the terminal device generates the initial transaction and broadcasts; the initial The transaction is stored in the blockchain; in the trusted network connection stage, any two terminals pass the two-way user and platform authentication of the blockchain; after the authentication is passed, in the update transaction stage, the terminal device generates an update transaction and broadcasts it; the update transaction is stored in the blockchain . The present invention combines blockchain and TNC to form an overall framework, without the participation of a trusted third party, to ensure two-way security authentication between users and platforms between terminal devices. Effectively defend against man-in-the-middle attacks and prevent malicious nodes from accessing the network. The invention is safe and credible, and is used for safe and credible connections in distributed networks.

A security diagnosis service system for smart grid equipment based on blockchain technology, including three participants: faulty equipment, original and non-original suppliers of equipment, and smartphones owned by users. When the faulty device is within the warranty period, the original supplier node will provide free diagnostic services for it. Otherwise, the maintenance and diagnosis rights of the equipment will be decided by the original supplier node and non-original supplier nodes through the decentralized equipment security diagnosis smart contract. According to the bidding price and reputation value of the responding node, the contract uses a multi-dimensional reverse auction method to determine the successful bidding node and diagnosis price. After the device diagnosis is completed, the relevant diagnostic information will be packaged and sent to the smart phone. The user will formulate the device operation policy and control the smart contract through the smart phone and according to the received message, so as to realize the efficient operation of the device. In the process of information interaction, a homomorphic encryption algorithm is used to ensure the security of the interactive information, and to ensure that the diagnostic information and the privacy of both parties will not be leaked during the interaction.

The invention discloses a colorful commodity anti-counterfeiting code generating method. The colorful commodity anti-counterfeiting code generating method comprises the following steps: converting a commodity identification code for representing the unique identity information of a certain commodity into a binary data; obtaining an initial value and parameters of a chaotic system based on the commodity identity information and an external secret key through calculation, and performing iteration on a chaotic mapping to generate two groups of chaotic signal binary sequences; performing bit manipulation taking 2bits as a unit on the commodity identification code by the chaotic binary signals to generate an anti-counterfeiting number overlapped with a colorful background, and further combining the anti-counterfeiting number into the colorful commodity anti-counterfeiting code. The colorful commodity anti-counterfeiting code generating method provided by the invention is simple, feasible, high in safety, and difficult to be cracked; and in addition, the generated colorful commodity anti-counterfeiting code is has the uniqueness and unforgeability.

The invention discloses a method for generating a commodity anti-counterfeiting code, which comprises the following steps: encoding commodity identity information according to certain predetermined rules to generate a unique commodity identification code; The identification code is converted into numerical data; the initial value, parameters, initial iteration steps and iteration interval steps of the chaotic system are calculated by using the commodity identity information and the external key, and two sets of chaotic sequences are generated after iterating the inclined chaotic tent map ; Use the position change scrambling rules before and after the two sets of chaotic signals to scramble the ciphertext characters in the corresponding relationship between numerical data, custom numerical data and ciphertext characters, generate commodity anti-counterfeiting numbers, and then combine to generate commodity anti-counterfeiting code. The method for generating the commodity anti-counterfeit code provided by the invention is simple and feasible, has strong security and is not easy to crack, and the generated commodity anti-counterfeit code has "uniqueness and unforgeability".