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Linkable Ring Signature Method Based on Anonymous Broadcast Encryption

A broadcast encryption and ring signature technology, applied in the field of information security, can solve problems such as insufficient security, inability to guarantee the anonymity of linkable verifiers, and narrow application range, so as to improve the efficiency of verification, improve security, and increase the scope of application Effect

Active Publication Date: 2021-02-26
XIDIAN UNIV
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  • Abstract
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Problems solved by technology

However, the linkability of this method can be verified by all verifiers. It is not suitable for scenarios that require permission to judge whether it is linkable. The application range is narrow, and the anonymity of linkable verifiers cannot be guaranteed, and the security is insufficient.

Method used

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  • Linkable Ring Signature Method Based on Anonymous Broadcast Encryption
  • Linkable Ring Signature Method Based on Anonymous Broadcast Encryption
  • Linkable Ring Signature Method Based on Anonymous Broadcast Encryption

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Embodiment Construction

[0044] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] refer to figure 1 , a linkable ring signature method based on anonymous broadcast encryption, including the following steps:

[0046] Step 1) Set ring signature parameters:

[0047] Set the number of ring members to be n, n≥2, take n=5 in this embodiment, and the identity of each ring member is ID x , x is the label of the ring member, x=[1,5]; set the one-way function sent by the trusted third party to the ring member as f;

[0048] Step 2) Ring Member ID x Get public parameters:

[0049] Step 2a) Ring Member ID x Using the group generation algorithm of probabilistic polynomial time, the group parameter gk of the ring signature is generated through the security parameters of the ring signature x :gk x =(G,q,g), wherein, G is a group whose order is a prime number q and whose generator is g;

[0050] In this step, the gr...

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Abstract

The present invention proposes a linkable ring signature method based on anonymous broadcast encryption, aiming to broaden the application range of linkable ring signatures and improve the security of linkable verifiers. The implementation steps are: set ring signature parameters; ring members ID x Get public parameters; ring member ID x Generate Key and Linkable Hash PK skx ;Trusted third party obtains broadcast encryption parameters and calculates ring member ID x The broadcast encryption private key SK IDx ; The signer calculates the linkable tag Tag and the tag ciphertext CT and obtains the ring signature σ of the message m; the verifier verifies the correctness of the ring signature σ; judges the identity of the verifier; the authorized user can link the ring signature σ Verify; the accountant calculates the signer information proof ψ; the verifier verifies the correctness of ψ. The present invention can be used in transaction scenarios under the block chain that require permission to judge whether it can be linked.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to a ring signature method, in particular to a linkable ring signature method based on anonymous broadcast encryption, which can be used in transaction scenarios that require authority to judge whether linkability is required under the blockchain. Background technique [0002] Digital signatures, also known as public key digital signatures and electronic signatures, are similar to ordinary physical signatures written on paper. At the same time, they use the technology in the field of public key encryption to identify digital information. This method is a digital string that only the sender of the message can produce and cannot be forged by others. This digital string is also an effective proof of the authenticity of the message sent by the sender of the message. Group signature is a kind of digital signature. It satisfies that in a group signature scheme, any member of a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/32
CPCH04L9/3218H04L9/3236H04L9/3255
Inventor 陈杰王启宇张跃宇庄立爽
Owner XIDIAN UNIV
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