A Certificateless Generalized Proxy Signcryption Method

Abstract

The invention discloses a non-certificate generalized proxy signcryption method, belonging to the field of secure communication, comprising: a key generation center sets system parameters; the key generation center generates a part of private keys; a user generates a secret value and part of private key together to set a complete private key and calculate the public key; the original signer or signer uses his private key and public key to generate a proxy authorization; after the proxy signature or signer verifies the proxy authorization, he uses the proxy authorization, his private key, The recipient's public key and system parameters perform generalized proxy signcryption processing on the message to be sent, and send the result to the recipient for generalized proxy decryption signcryption processing. The present invention can realize proxy signature or signcryption, and the two functions of proxy signature and proxy signcryption can be realized only by using a pair of keys and an algorithm, providing confidentiality and (or) authentication for users; and based on certificateless cryptography The implementation of the system solves the key escrow problem and reduces the high cost of public key management.

Description

technical field [0001] The invention belongs to the technical field of information security, and in particular relates to a certificateless generalized proxy signcryption method. Background technique [0002] In the traditional public key cryptography system, the public key is a bunch of garbled characters, so a trusted third party - Certificate Authority (Certificate Authority, hereinafter referred to as CA) is required to issue a certificate to bind the user's public key with its identity information . However, the high cost of certificate management hinders the widespread use of traditional public key cryptography. [0003] The identity-based cryptosystem can reduce the high cost of certificate management. It is a concept proposed by Shamir in CRYPTO'84 in 1984. The identity-based cryptosystem is to determine the user's public key first, and then calculate the corresponding private key. Therefore, the public key can be taken as the user's identity information, thereby ...

AI Technical Summary

Problems solved by technology

This will inevitably increase the space for storing keys in the system, the cost of managing keys, the time for verifying keys, and the implementation complexity brought to the system by implementing the two algorithms

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