Key distribution and reconstruction method and device based on mobile internet

Abstract

The invention provides a key distribution and reconstruction method based on the mobile internet. The method includes the steps of S1, constructing an identity-based key packaging model and a verifiable random function; S2, distributing keys; S3, reconstructing the keys. A calculable collusion-proof equilibrium method is designed, a protocol collusion-proof game-with-entropy model is constructed, and thus collusive attack of participants is prevented; a cryptographic protocol communication game model is constructed, and the defect that password protocols constructed in the broadcast communication network are unable to be implemented in the mobile internet is overcome; the key packaging mechanism applicable to the verifiable random function is studied, the rational key sharing protocol requiring no pubic key infrastructure is designed, and calculation fairness and delivery in the mobile internet is guaranteed; finally, the protocol is subjected to security analysis and proving through the theory of provable security.

Description

technical field [0001] The present invention relates to the technical field of mobile Internet security, in particular to a method and device for key distribution and reconstruction based on mobile Internet Background technique [0002] Key sharing is an important research content in the field of network security, and it is also the cornerstone of many security protocols. In classical key sharing protocols, it is assumed that some participants are honest and others are malicious. The honest person always abides by the agreement, and the malicious person can deviate from the agreement at will. In reality, it is very dangerous to base the security of a protocol on assuming and relying on someone to be honest. Common sense tells us that even people who are considered honest by ordinary people will cheat, and even conspire with others to cheat. There are two types of classic key sharing algorithms, under certain conditions, one is a scheme involving trusted parties. The othe...

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Problems solved by technology

[0012] In response to the above problems, this patent has carried out theoretical and methodological research in the following aspects: combining game theory, information theory, and cryptographic algorithms, on the basis of mobile Internet communication networks, it aims at anti-collusion methods for rational key sharing protocols, network communication methods, and key encapsulation mechanisms To study and improve key theories such as ciphers, design a computable anti-collusion equilibrium method, construct an anti-collusion game model of the protocol, and prevent participants from colluding to attack; construct a communication game model of a cryptographic protocol, and make up for the fact that the cryptographic protocol constructed under the broadcast communication network cannot be used in mobile networks. Due to the defects in the implementation of the Internet environment, the present invention provides a method and device for key distribution and reconstruction based on the mobile Internet, researches the key encapsulation mechanism suitable for verifiable random functions, and designs rational keys that do not require public key infrastructure Share the protocol to ensure the fairness and delivery of computing in the mobile Internet environment; finally, use the provable security theory to analyze and prove the security of the protocol

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