A multi-receiver signcryption method for keyless escrow problems based on elliptic curves

Abstract

This invention discloses a multi-receiver signcryption method based on keyless trusteeship problem of elliptic curve, and solves the technical problem of private key trusteeship existed in the existing multi-receiver signcryption method. The method comprises the following steps: a user randomly selects a secret value as own private key, calculates a verification share according to own private key, and sends the verification share and own identity information to a private key generating center KGC; the private key generating center KGC generates a public key, a public key verification parameter and a public key hiding parameter of the user according to the verification share and the identity information sent by the user, and sends the public key, the public key verification parameter and the public key hiding parameter to the user; and after receiving the parameters sent by the private key generating center KGC, the user verifies the public key. Since the private key of the user is the secret value randomly selected by the user, the private key generating center KGC only knows the public key and corresponding identity information of the user, and cannot acquire the private key of the user to realize keyless trusteeship. Simultaneously, the signcryption efficiency is improved; and the bandwidth is reduced.

Description

technical field [0001] The invention relates to a multi-receiver signcryption method, in particular to a multi-receiver signcryption method based on an elliptic curve-based non-key escrow problem. Background technique [0002] In distributed network applications (such as web conferencing, round table conferences, pay TV, etc.), in order to overcome the key escrow problem and certificate management problem, protect the identity privacy of all participants in the communication system in the session, and ensure that the session content can only be Authorized users can decrypt correctly, but non-authorized users cannot decrypt correctly, which requires the support of secure broadcast technology. Secure broadcast is a security technology that enables one sender to send the same message to multiple authorized receivers, and can meet the security requirements of the above-mentioned network applications. [0003] Document 1 "Anonymous and Provably Secure Certificateless Multireceiv...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency of key escrow in the existing multi-receiver signcryption method, the present invention provides a multi-receiver signcryption method based on elliptic curve without key escrow problem

During this process, the user's private key is a secret value randomly selected by the user. The key generation center KGC only knows the user's public key and the corresponding identity information, so it cannot obtain the user's private key, which solves the key escrow problem; the user The public key is a value rather than a public key pair, so it solves the problem of excessive bandwidth required in the communication process; at the same time, in the signcryption process, the associated information between the sender's calculation and each receiver is used to perform signcryption operations , so that the number of multiplication operations on the elliptic curve used in the whole signcryption process is much smaller than that of the same type of scheme, so the computational efficiency of the signcryption operation is greatly improved

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