Signcryption method from certificateless environment to identity environment

Abstract

The invention discloses a signcryption method from a certificateless environment to an identity environment and belongs to the field of secure communication. In order to enable a sending end based on the certificateless environment to send messages to a receiving end based on the identity environment through the signcryption method, the signcryption method includes the steps that after system parameters are initialized, a key generation center generates a part private key DA and sends the part private key DA to the sending end, and the sending end generates a secrete value randomly based on the system parameters, and a complete private key SA and a public key PKA are arranged with the part private key DA; a private key generation center generates a private key SB and sends the private key SB to the receiving end; the sending end generates a signcryption ciphertext according to the system parameters, the identity of the sending end, the complete private key SA, the public key PKA, the identity of the receiving end and the messages m, and the ciphertext, the identity of the sending end and the public key PKA are sent to the receiving end to conduct signcryption treatment. The signcryption method is used for signcryption communication of a heterogeneous network, and end-to-end secrete, complete, certificated and undeniable services are provided for users in the certificateless environment and users based on the identity environment.

Description

technical field [0001] The invention belongs to the technical field of secure communication, and in particular relates to a heterogeneous signcryption method in which a sending end belongs to a certificateless environment and a receiving end belongs to an identity-based environment. Background technique [0002] Cryptography is an important tool to realize secure communication. The basic security services provided by the cryptographic system include confidentiality, integrity, authentication and non-repudiation. Confidentiality means that information is only available to authorized users and cannot be disclosed to unauthorized users. Integrity refers to the characteristic that information cannot be destroyed or lost by accidental or deliberate deletion, modification, forgery, replay, insertion, etc. during transmission or storage. Authentication is ensuring that a communicating party is who it claims to be. Confirming the identity of an entity is called entity authenticat...

AI Technical Summary

Problems solved by technology

[0004] (2) Signcryption allows parallel computation of some expensive cryptographic operations

This method has the following two disadvantages: ① Before using any public key, it is necessary to verify the validity of the public key certificate, which increases the amount of calculation for the user; ② CA needs to manage a large number of certificates, including certificate issuance, storage, revocation, etc.

However, the identity-based cryptosystem has a fatal shortcoming: all users' private keys are generated by PKG

[0013] In 2010, Sun and Li proposed a heterogeneous signcryption scheme where one party belongs to the public key infrastructure environment and the other belongs to the identity-based environment [Sun Y, Li H. Efficient signcryption between TPKC and IDPKC and its multi-receiver construction.SCIENCE CHINA Information Sciences,2010,53(3):557-566.], but this scheme only satisfies external security (that is, the attacker cannot be the sender or the receiver), and such a scheme cannot provide denial

[0018] However, none of the above signcryption methods can be applied to communication problems where the sender belongs to a certificateless environment and the receiver belongs to an identity-based environment.

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