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Encryption and decryption method and system for expanding fingerprint template based on reference points

A fingerprint template and reference point technology, applied in the field of information security, can solve the problems of affecting encryption and decryption, affecting the fingerprint matching process, etc.

Active Publication Date: 2019-11-08
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quality of alignment directly affects the matching process of fingerprints, which in turn affects the results of encryption and decryption

Method used

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  • Encryption and decryption method and system for expanding fingerprint template based on reference points
  • Encryption and decryption method and system for expanding fingerprint template based on reference points
  • Encryption and decryption method and system for expanding fingerprint template based on reference points

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Experimental program
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Embodiment Construction

[0018] This embodiment includes the following steps:

[0019] Step 1) Select the total number m of the extended directional reference points, an integer set

[0020] Step 2) Set the distance r between the extended reference point and the original point, and an angle change Δθ

[0021] Step 3) construct multiple candidate directed reference points;

[0022] Step 3.1) Obtain the existing directed reference point drp=(x, y, θ)

[0023] Step 3.2) Make a circle with the directed reference point drp as the center and r as the radius, and evenly take m-1 points on the circle, for example, one is the intersection point p' of the radius to the right and the circle. Therefore, m-1 additional directional reference point positions are generated, plus the original directional reference point position, a total of m extended candidate directional reference point position sets

[0024] Step 3.3) According to Δθ, for Construct three candidate directed reference points drp respective...

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Abstract

The invention relates to an encryption and decryption method and system based on reference-point expansion fingerprint templates. The method comprises the following steps of: setting the total position number m of expanded directed reference points, and an integer set I in the range of (1,3m); selecting the distance r between an expanded reference point and an original point, and an angle variation delta theta; constructing a candidate directed reference-point list A according to set parameters; when encryption is carried out, adopting an expanded reference point FORMULA that the subscript j satisfies FORMULA for fingerprint pre-alignment, so that ciphertexts in n versions are generated; and, when decryption is carried out, adopting an expanded reference point FORMULA that the subscript j satisfies a formula as shown in the description for pre-aligning fingerprint templates, so that (3m-n+1) pre-aligned fingerprint templates are generated, and respectively used for decrypting the ciphertexts. On the premise that an original directed reference-point extraction method is not changed, the method is expanded; fingerprints are pre-aligned by adoption of multiple directed reference points; multiple available ciphertexts are generated; and thus, the fingerprint encryption and decryption success rate is increased.

Description

technical field [0001] The present invention relates to a technique in the field of information security, in particular to an encryption and decryption method and system based on a reference point extended fingerprint template. Background technique [0002] In the current partial fingerprint encryption and decryption process, the alignment of fingerprint templates is a very important process. The quality of alignment directly affects the matching process of fingerprints, and then affects the results of encryption and decryption. In order to better align fingerprints and reduce the auxiliary data required to store fingerprint templates for aligning fingerprints, a feature point called a directed reference point is proposed for pre-aligning fingerprints. The basic principle For: extract all available minutiae points from a given fingerprint template M={m i =(x i ,y i , θ i )} and the directed reference point drp=(x, y, θ), according to the reference point drp, for trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08H04L29/06G06F21/10
CPCG06F21/10H04L9/0866H04L63/0428
Inventor 陆海宁黎相敏谷大武丁宁罗红王姗姗许蓓蓓袁瑗
Owner SHANGHAI JIAOTONG UNIV