Certificateless key packaging method for resisting leakage of bounded secret information

Abstract

The invention discloses a certificateless secret key packaging method for resisting the leakage of bounded secret information. The certificateless secret key packaging method comprises the steps of system initialization, user secret key generation, packaging and de-packaging. Complex bilinear mapping is not used in each step, so the operation efficiency and the practicability are improved; on thepremise of ensuring that the public parameter form is not changed, the length of the user key is increased, and the secret information leakage length tolerable by the method is increased; all elementsin the packaging ciphertext are completely random to any enemy; any enemy cannot obtain secret information of a related private key from a packaging cipher, leakage parameters are kept fixed and areirrelevant to the size of a packaging secret key space, the anti-leakage capacity is not reduced due to increase of the packaging secret key space, and high safety is still kept in a real environmentwith leakage. The method has the advantages of high safety, wide application range, high practicability and the like, and can be applied to the technical field of digital transmission with limited network environment.

Description

technical field [0001] The invention belongs to the technical field of key encapsulation systems, and in particular relates to a non-certificate key encapsulation method that resists leakage of bounded secret information. [0002] technical background [0003] In 2003, AL-Riyami and others proposed a certificateless public key cryptography system, which solved the certificate management problem under the traditional public key cryptography system, and also solved the certificate management problem based on the identity cryptography system. In recent years, the study of certificateless cryptographic primitives has attracted extensive attention from cryptography researchers. In 2007, Huang et al. proposed a new cryptographic primitive called the certificateless key encapsulation system. In the study of this cryptographic primitive, the impact of leaking secret state information on the security of the system was ignored. In a real environment, the adversary can obtain secret in...

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Problems solved by technology

[0004] "Leakage-Resilient Certificateless Key EncapsulationScheme.Informatica" (Lithuanian Academy of Sciences, January 2018), published by Jui-Di et al., proposed an anti-leakage certificateless key encapsulation method, which used the Complex bilinear mapping, and the length of the ciphertext is long, resulting in low computational efficiency and practicality of the construction, and the method is weak against leak attacks

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