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An Attribute-Based Outsourcing Scheme for Bgn-type Ciphertext Decryption

A technology of ciphertext and attributes, which is applied in the field of information security and can solve problems such as illegal reading of ciphertext

Active Publication Date: 2020-08-11
ENG UNIV OF THE CHINESE PEOPLES ARMED POLICE FORCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, part of the decryption of the ciphertext in this scheme is carried out by the cloud, which requires trust in the outsourced server, and both the ciphertext and the conversion key TK may be illegally read

Method used

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  • An Attribute-Based Outsourcing Scheme for Bgn-type Ciphertext Decryption
  • An Attribute-Based Outsourcing Scheme for Bgn-type Ciphertext Decryption
  • An Attribute-Based Outsourcing Scheme for Bgn-type Ciphertext Decryption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Example 1: Attribute-based BGN-type ciphertext decryption outsourcing scheme

[0108] Such as figure 1 The specific steps of the attribute-based BGN type ciphertext decryption outsourcing scheme shown are as follows:

[0109] Step (1): Set system parameters, generate encryption key, master key MSK and public key PK, the specific process of step (1) is as follows:

[0110] Step (1-1): Set system parameters, input security parameter λ and attribute space U, where U={0,1} * ; The value of the input security parameter λ is relatively large. In this embodiment, λ is selected as 1024bit, which is sufficient to ensure the security of the scheme.

[0111] Step (1-2): Run the algorithm ξ(λ) to get the tuple (q 1 ,q 2 , G, G 1 , e) and the bilinear map e:G×G→G 1 , where q 1 ,q 2 is a prime number, G, G 1 Both are of order n=q 1 q 2 group of ; ξ(λ) is a public parameter generation algorithm, q 1 ,q 2 is a large prime number, select q in this embodiment 1 ,q 2 It is ...

Embodiment 2

[0141] Example 2: Attribute-based BGN-type ciphertext decryption outsourcing scheme

[0142] The specific plan is as follows:

[0143] Step (1): Set system parameters, generate encryption key, master key MSK and public key PK, the specific process of step (1) is as follows:

[0144] Step (1-1): Set system parameters, input security parameter λ and attribute space U, where U={0,1} * ; The value of the input security parameter λ is relatively large. In this embodiment, λ is selected as 1024bit, which is sufficient to ensure the security of the scheme.

[0145] Step (1-2): Run the algorithm ξ(λ) to get the tuple (q 1 ,q 2 ,G,G 1 , e) and bilinear map e:G×G→G 1 , where q 1 ,q 2 is a prime number, G, G 1 Both are of order n=q 1 q 2 group of ; ξ(λ) is a public parameter generation algorithm, q 1 ,q 2 is a large prime number, select q in this embodiment 1 ,q 2 It is a prime number of 512bit size.

[0146] Step (1-3): Randomly select generators k, u in the group G, and ...

Embodiment 3

[0185] Example 3: Attribute-based BGN-type ciphertext decryption outsourcing scheme

[0186] The specific plan is as follows:

[0187] Step (1): Set system parameters, generate encryption key, master key MSK and public key PK, the specific process of step (1) is as follows:

[0188] Step (1-1): Set system parameters, input security parameter λ and attribute space U, where U={0,1} * ; The value of the input security parameter λ is relatively large. In this embodiment, λ is selected as 1024bit, which is sufficient to ensure the security of the scheme.

[0189] Step (1-2): Run the algorithm ξ(λ) to get the tuple (q 1 ,q 2 ,G,G 1 , e) and bilinear map e:G×G→G 1 , where q 1 ,q 2 is a prime number, G, G 1 Both are of order n=q 1 q 2 group of ; ξ(λ) is a public parameter generation algorithm, q 1 ,q 2 is a large prime number, select q in this embodiment 1 ,q 2 It is a prime number of 512bit size.

[0190] Step (1-3): Randomly select generators k, u in the group G, and ...

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Abstract

The invention particularly relates to a BGN type cryptograph decryption outsourcing scheme based on attributes. The scheme comprises steps that (1), a system parameter is set, and an encryption secret key is generated; (2), an access structure is selected by a sending side, message encryption is carried out, and cryptograph is generated; (3), a main secret key and the attributes are inputted by a receiving side, and a conversion secret key and a private secret key are outputted; (4), the cryptograph is sent by the sending side to a cloud end; (5), the conversion secret key is sent to the cloud end by the receiving side; (6), the cryptograph is converted by the cloud end through utilizing the conversion secret key to acquire a part of the cryptograph which is sent to the receiving side; and (7), the private secret key is utilized by the receiving side to decrypt the part of the cryptograph to acquire a message, and homomorphic computation operation for the cryptograph carried out by the cloud end is further comprised between the step (4) and the step (5). The scheme is advantaged in that not only can system decryption efficiency be improved, but also storage cost of a receiver is reduced; according to the cryptograph acquired according to the encryption method, a server is permitted to carry out multiple addition homomorphic operation and multiplication homomorphic operation for cryptograph data, on the condition that decryption difficulty does not increase, CPA safety of the user information is substantially improved.

Description

technical field [0001] The invention belongs to the technical field of information security, and in particular relates to an attribute-based BGN type ciphertext decryption outsourcing scheme. Background technique [0002] The introduction of the concept of cloud computing has brought the development of the information industry into the fast lane. Cloud services not only provide users with massive storage services and powerful computing capabilities, but also promote economic development. Public clouds are mainly maintained and operated by untrustworthy third-party service providers, and security issues associated with cloud computing are also increasing. highlight. Cloud security is considered to be the biggest challenge among many difficulties faced by the practical application of cloud services, and it is also the biggest problem that cloud services need to solve urgently. If the user saves sensitive data to the cloud server in plain text, the cloud may copy or even tamp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/06H04L9/08H04L9/30H04L29/06
CPCH04L9/0643H04L9/0819H04L9/0869H04L9/3073H04L63/0428H04L63/06
Inventor 张薇李镇林杨晓元周潭平张帅伟张敏情韩益亮薛帅
Owner ENG UNIV OF THE CHINESE PEOPLES ARMED POLICE FORCE
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