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Distributed multi-authorization-party ciphertext policy attribute-based encryption method for medium confusion

A technology of attribute-based encryption and ciphertext strategy, applied in the field of cloud computing security, which can solve problems such as collusion attacks

Active Publication Date: 2019-08-02
FUJIAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, malicious users have the opportunity to collect decryption private keys through illegal methods and launch collusion attacks

Method used

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  • Distributed multi-authorization-party ciphertext policy attribute-based encryption method for medium confusion
  • Distributed multi-authorization-party ciphertext policy attribute-based encryption method for medium confusion
  • Distributed multi-authorization-party ciphertext policy attribute-based encryption method for medium confusion

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] Please refer to figure 1, the present invention provides a distributed multi-authorized party ciphertext policy attribute-based encryption method for media confusion, and provides a system including a public parameter setting server, a data owner Do, a cloud storage server Css, a data user DU, and a media MDR, including The following steps:

[0038] Step S1: Input security parameter 1 in the public parameter setting server λ , get the public parameter PP and the pseudo-random function PRF(·); establish L attribute authorization centers Per property authority Manage the corresponding property set And establish a trusted medium between the data owner and the data user, generate a pseudo-random function PRF( ) and send it secretly to all attribute authorization centers (AAs) and the medium;

[0039] Step S2: The attribute authorization cente...

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Abstract

The invention relates to a distributed multi-authorization-party ciphertext policy attribute-based encryption method for medium confusion, which is characterized in that when a new attribute authorization center is added into a system, the new attribute authorization center is secretly distributed with a pseudorandom function PRF (.). In order to prevent collusion of users who possess all relevantattributes in a certain relevant attribute management domain, a trusted medium (MDR) is employed in this system. A data owner generates a ciphertext CT including a obfuscation function. Because the secure DO is used, online interaction does not need to be maintained. Similarly, the DO transmits a key to the MDR, where the key is a function variable for receiving a key skU obtained by the user U from the MDR. The skU is calculated from a PRF (.), a GidU of U, or the like. U has the ability to calculate a function, but does not reveal the internal program secret. Wherein I represents a set of AAs serial numbers of an attribute authorization center for managing U attributes, if the identity IDU of U is confirmed, a corresponding private key USKj is issued to the user U, and the MDR sends a private key skU to the user U. And finally, the U decrypts the ciphertext CT by using USKj (j belongs to I).

Description

technical field [0001] The invention relates to the technical field of cloud computing security, in particular to a distributed multi-authorized party ciphertext policy attribute-based encryption method for media confusion. Background technique [0002] Cloud computing is a new type of computing architecture with a wide range of applications. More and more organizations or applications require dynamic management. To solve the problem of fine-grained access control in cloud environments, Sahai and Waters proposed attribute-based encryption (ABE), where user identity is determined by its attributes. ABE is applied to one-to-many encryption situations, where data is encrypted according to a certain attribute-related access strategy and can be decrypted by any user whose attributes satisfy the access strategy. The ABE scheme with only one authorization center has the problem of over-centralization of power and will reduce security. In order to avoid this problem, the multi-at...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04L29/08
CPCH04L9/0861H04L67/1097
Inventor 李继国张亦辰胡声洲
Owner FUJIAN NORMAL UNIV
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