Content sharing privacy protection method for resisting collusion attacks

Abstract

The invention provides a content sharing privacy protection method for resisting collusion attacks, which is used for solving the problem that the existing content sharing privacy protection method rarely considers prevention of network attacks such as collusion and cannot resist collusion attacks. The method comprises the following steps of: a responsibility tracing list and a public and private key pair of a user are generated; the publisher formulates an LSSS access strategy, and encrypts the content to generate a ciphertext; a consumer requests content, executes a key generation algorithm to generate a private key, and performs auditing and responsibility investigation in a responsibility investigation list; the ciphertext cloud server verifies the identity of the consumer and then downloads a ciphertext from the cloud service routing node; the attribute authorization center audits the leaked private key and the responsibility investigation list, updates the responsibility investigation list and deletes the secret value; and the attribute authorization center calculates and updates the key, and the consumer and the publisher update the ciphertext. According to the method, the cache hit rate of the routing node can be improved, the cache privacy risk and the content request time delay are relatively low, and the CCN energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of privacy protection, in particular to a content sharing privacy protection method against collusion attacks. Background technique [0002] In order to solve the inherent security problems in CCN (Content-Centric Network), more and more information security scholars have begun to use cryptographic technology to apply it to the CCN architecture. But different from the traditional network, these technologies must start from protecting the content itself and be designed as a flexible and scalable access control mechanism to meet the needs of CCN. Therefore, attribute-based encryption technology has become one of the most ideal technologies in the fine-grained access control mechanism of CCN. Zhang et al. proposed a CP-ABE (ciphertext-based attribute encryption) scheme to hide the access structure, which supports access tree strategies, and proved that the scheme is replay-safe (RCCA) under chosen ciphertext a...

AI Technical Summary

Problems solved by technology

[0031] Aiming at the technical problem that the existing content sharing privacy protection methods seldom consider preventing network attacks such as collusion and cannot resist collusion attacks, the present invention proposes a content sharing privacy protection method against collusion attacks, which has hidden strategies and attribute revocation Content sharing scheme (PCSAC) to resist collusion attacks; under the premise of ensuring user privacy in the CCN system, it has a high cache hit rate, low cache privacy risk and content request delay

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