Asymmetric cross-password system encryption and decryption method and system

Abstract

The invention provides an asymmetric cross-password system encryption and decryption method and system with an aim to combine with advantage identity-based encryption (IBE) algorithm and effectively solve the problem about difficulty in public key management. Meanwhile, the invention provides cipher test conversion method from an identity-based broadcast encryption system rich in function but high in energy consumption to a simple and efficient identity-based encryption system, and plain texts cannot be revealed during the entire conversion. The asymmetric cross-password system re-encryption method is applicable to data-sharing environment in which accessing terminal computing capabilities are asymmetric, proper encryption systems are deployed to terminals with different computing capabilities, and meanwhile, a safe and effective way is provided for uses with high computing capabilities to share secret data to users with low computing capabilities.

Description

technical field [0001] The present invention relates to the technical field of communication encryption and decryption, and more specifically, to an asymmetric cross-cipher system re-encryption and decryption method and system. Background technique [0002] At present, with the development of information and communication technology, various cryptographic systems have been proposed to realize the security and confidentiality of data transmission. According to whether the keys held by the two communicating parties are the same, the cryptographic system can be divided into two parts: private key encryption system and public key encryption system. In the private key encryption system, the two communicating parties have the same key (private key); in the public key encryption system, the receiver has a pair of keys, namely the encryption key and the decryption key, the encryption key can be made public, and the decryption key The key needs to be kept secret. The algorithms of ...

AI Technical Summary

Problems solved by technology

[0008] In the aforementioned application scenario, the access terminals used by Alice and Bob are different (Alice uses a desktop computer with strong computing power, and Bob uses a handheld terminal with weak computing power), and the encryption system deployed on the access terminal does not need to be deployed (the desktop computer has a powerful deployment function). However, the resource-consuming IBBE encryption system and the IBE encryption system with weak computing power but simple functions deployed on handheld terminals) have led to a problem that most proxy re-encryption cannot solve: how to integrate the encryption system (IBBE encryption system) that requires high terminal computing power ) of the ciphertext is converted into the ciphertext of the encryption system (IBE) with low requirements on the computing power of the terminal through proxy re-encryption

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