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 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 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".