Attribute-based Verifiable Outsourcing Signcryption Method and System

Abstract

The invention discloses an attribute-based verifiable outsource de-signcryption method. The method comprises the following steps: generating a public key and a main secret key of a cryptographic system by adopting an attribute field composed of a signature attribute set and a decryption attribute set, and then generating a signature secret key and the decryption secret key of a user; performing signcryption on the plaintext to generate the sign-ciphertext, and storing the sign-ciphertext on a ciphertext storage server; downloading the sign-ciphertext, and generating a conversion secret key anda recovery secret key; performing blind processing on the signature in the sign-ciphertext, and then sending the conversion secret key, partial sign-ciphertext and the blinded signature to a cloud server; receiving a signature verification result and converted sign-ciphertext of the cloud server; when the decryption attribute set of the user downloading the sign-ciphertext satisfies an encryptionstrategy of the user uploading the sign-ciphertext, computing a verification value according to the recovery secret key and the secret value; when the value of the verification result is equal to theverification value, computing partial sign-ciphertext into which the symmetric secret key is embedded, and recovering the plaintext of the user downloading the sign-ciphertext by using disposable symmetric decryption operation.

Description

technical field [0001] The invention relates to the field of outsourcing services in a cloud environment and the fields of data encryption and privacy protection for network security, and in particular to an attribute-based verifiable outsourcing deciphering method and system thereof. Background technique [0002] With the rapid development of cloud computing, many companies and individuals choose to use cloud servers to store and share data. Because cloud servers have strong computing power, they consider outsourcing a large number of complex calculations to cloud servers. Taking online social networks as an example, due to the high cost of establishing and maintaining social network data, many social services are outsourced to third-party providers. But in the outsourcing process, the most critical issue is how to ensure the security and privacy of social information. Cloud servers can not only access data uploaded by users, but also leak and tamper with social informati...

AI Technical Summary

Problems solved by technology

In this regard, an attribute-based signcryption scheme based on the ciphertext policy of the cloud-based PHR sharing system is proposed in the prior art. Although this scheme can guarantee the security and privacy of the PHR information, it is difficult to verify the signature and decryption. Computational cost increases computational overhead and communication overhead for PHR users

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