Hash calculation method and signcryption method based on homomorphic chameleon Hash function

Abstract

The invention discloses a Hash calculation method and a signcryption method based on a homomorphic chameleon Hash function. According to the provided homomorphic chameleon hash function, a chameleon hash value result adopts a logarithm form, a signcryption result based on the hash in the signcryption method is also a logarithm form, so that the homomorphic property is achieved, the homomorphic aggregation can be conducted in hash calculation, hash is more efficiently calculated, and the homomorphic chameleon hash function has both the homomorphic state and the key leakage prevention characteristics. The signcryption method is realized on the basis of the homomorphic chameleon hash function, the homomorphic aggregation signcryption ensures the homomorphism, the system public parameters generated by the system initialization are used together by the chameleon hash function and the signcryption, and two password schemes share one set of system parameters, so that multiple function effectscan be realized under one set of shared system parameters, and multiple functions are supported under the same framework. Secondly, the proxy key generation and proxy re-signature steps realize the proxy re-signature, and the non-repudiation is realized through a repudiation step.

Description

technical field [0001] The invention belongs to the technical field of network security, and in particular relates to a hash calculation method and a signcryption method of a homomorphic chameleon hash function. Background technique [0002] The chameleon hash function is a trapdoor one-way hash function, which can efficiently calculate the hash value, and without the trapdoor, it is difficult to find the collision of the hash. Existing chameleon hash functions are not homomorphic, so they cannot aggregate multiple hash values ​​into one hash value. The hash value without homomorphism needs to be hash calculated for each message, and the calculation results are not relevant. For a message composed of multiple messages, it needs to be recalculated according to its plaintext, so the calculation frequency is high. The computational overhead is high, and the hash value with homomorphism only needs to aggregate multiple values ​​simply and efficiently. Therefore, the calculation...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing chameleon hash function for hash calculation does not have homomorphism, cannot aggregate multiple hash values, and the existing signcryption method cannot support proxy re-signature and simultaneous signature in one framework. Multiple functions of morphism and non-repudiation, the user privacy protection effect is not good enough, a hash calculation method and a signcryption method of the homomorphic chameleon hash function are proposed

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