Group signature method suitable for large groups

A group signature and group trustworthy technology, which is applied to the public key of secure communication, user identity/authority verification, electrical components, etc., can solve the problems of calculation amount, communication amount and efficiency that are not suitable for large groups, and achieve saving time and high efficiency

Inactive Publication Date: 2010-08-11
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ACJT method is not suitable for large groups in terms of signature speed, calculation amount, communication volume and efficiency, so the researchers proposed a group signature method that does not rely on knowledge signatures and is

Method used

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  • Group signature method suitable for large groups
  • Group signature method suitable for large groups
  • Group signature method suitable for large groups

Examples

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0029] like figure 1 , figure 2 and image 3 As shown, this embodiment includes the following steps:

[0030] Step 1, the system is established, the trusted center (TC) generates system parameters, selects three prime numbers p, q, f and RSA modulus n=pq, and simultaneously selects e and d to satisfy Let g be Z n * An element of order f in , H( ) is a Hash function: , (k=160). Pick a random number Calculate y=g x(mod n).

[0031] The trusted center (TC) sends (d, x) to the group manager (GM) as the group private key, and then discloses (n, e, f, g, y) as the group public key. Trusted Center (TC), Group Manager (GM) and each group member are regarded as computers or nodes that process or jointly process specific operation steps.

[0032] Here is a further explanation of the selection method of the three prime numbers (p, q, f): select Z n * An...

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PUM

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Abstract

The invention discloses a group signature method suitable for large groups, which comprises the following steps: generating system parameters, adding new members, generating a group signature, and verifying the group signature, wherein a group trusted center selects a group private key and a group public key for a group administrator; when a new member joins in the group, the new member randomly selects (xA, z), stores xA as the private key thereof and transmits z to the group administrator, the group administrator signs z by using the private key thereof, the signature result is (r, s, w), and the group administrator stores the member identity information (w, z) and transmits the (r, s, w) to the new member; after receiving the (r, s, w), the new member verifies whether the (r, s, w) is valid by using the group public key (e, n), and if so, the new member accepts (s, w) as the member certificate and joins successfully; any member in the group can generate a group signature (u, t, s1, s2) for the message m of a signature requester according to the signature algorithm by utilizing the member certificate and the private key xA; and after obtaining the signature the (u, t, s1, s2), a verifier calculates a verification equation. When a new member joins in, the invention does not need to update the group public key and the member private keys, thereby saving time; and when opening the signature, the identity of a signer can be traced.

Description

technical field [0001] The invention relates to a digital signature method in e-commerce / government affairs, in particular to a group signature method suitable for a large group with a large number of group members. Background technique [0002] With the development of network technology and e-commerce, digital signature technology has been deeply studied, and many new application environments require digital signature to support some special functions. Group signature means that all signers form a group (group for short), and each member in the group can sign anonymously on behalf of the group. Each group is managed by a trusted group authority, which is responsible for the Composition and update, and in the event of a dispute, the identity verification of the signer can be performed according to some pre-set agreements, and the person in this authority is usually called the manager of the group. Group signatures can be publicly verified. Anyone who holds the group public ...

Claims

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Application Information

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IPC IPC(8): H04L9/32H04L9/30H04L29/06
Inventor 耿永军邵国金何宗耀薛冰周二强李俊
Owner HENAN UNIV OF URBAN CONSTR
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