Certificateless multi-proxy signcryption method with forward secrecy

Abstract

The invention belongs to the fields of communication data authentication and privacy in a wireless network and provides a certificateless multi-proxy signcryption method with forward secrecy. An original signcrypter private key is constantly updated in a dynamic updating stage, and a proxy secret key is constantly updated too, a signcryption public key is unchanged in a whole process; furthermore, the private key is updated through a secrete key updating algorithm which is an one-way function; therefore, system overhead under a condition of higher security is reduced due to addition of a certificateless cryptosystem, thus meeting requirements of an original multi-proxy signcryption system on security, strong identifiability, public verification, strong non-repudiation and abuse resistance; in addition, the method can meet higher requirements on forward secrecy and strong unforgeability.

Description

technical field [0001] The invention belongs to the field of authentication and security of communication data in a wireless network, and in particular relates to a forward-secure non-certificate multi-agent signcryption method. Background technique [0002] In the application of computer communication and electronic commerce, confidentiality and authentication are one of the most important issues. In 1997, Zheng proposed the concept of signcryption. The signcryption system integrates the functions of signature and encryption, and realizes the functions of encryption and signature in one step. In 1999, Gamage et al. first proposed a proxy signcryption scheme, namely a The original signer can designate a proxy signcryptor as its proxy, and the proxy signcryptor generates an effective proxy signcryption process for the authorized message on behalf of the original signcryptor. However, in real life, it is often necessary for the original signcryptor to grant rights to multiple...

AI Technical Summary

Problems solved by technology

[0003] Existing multi-agent solutions are based on certificates or identities, and most of them do not take into account the loss of the private key of the original signcryptor, the private key of the proxy signcryption group member group, and the loss of the proxy key, or even the loss of the session at the current stage. The security of the scheme in the case of the loss of the secret key, that is, strong forward security cannot be guaranteed

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