Universal specified participant threshold secret sharing method in non-honesty environment

Abstract

The invention discloses a universal specified participant threshold secret sharing method in a dishonest environment, and the method comprises the steps: employing an RSA encryption algorithm in an initialization stage, enabling each participant to select an encryption key, hiding the encryption key on an index, and not building a safety channel between a distributor and the participant; in the secret distribution stage, any threshold secret sharing scheme can be used, and the original secret share of the participant is hidden by using the XOR operation, so that the characteristic of the specified participant is realized; in the secret reconstruction stage, each participant calculates and publishes an XOR value, other participants can use the public value to verify the correctness of the secret share and perform XOR operation to obtain the original secret share for reconstruction, and finally the original secret share is recovered to obtain the secret. According to the invention, flexible access control is provided, internal threats can be effectively prevented, and data security is ensured.

Images