# Introduction to Technology | Understanding Bulletproofs of Zero Knowledge Proof Algorithms –Range Proof III

## Foreword

This article mainly shares the specific implementation details of the Bulletproofs-based Range proof, and makes a comparative analysis with the existing implementation on github.

Step1. Understand Bulletproofs-Range Proof I ( https://www.8btc.com/media/530155 )

Step2. Understanding the Bulletproofs of Zero Knowledge Proof Algorithm-Range Proof II ( https://www.8btc.com/media/532874 )

## An open source implementation

The open source implementation of Bulletproof's rangeproof. The project address is ( https://github.com/dalek-cryptography/bulletproofs ). Compared to the content shared in this article, the content shown in the following figure is mainly different from the following:

1. This article is based on the discrete logarithm; the figure is based on the discrete logarithm of the elliptic curve, so you only need to convert the exponential operation to the multiplication operation

2. The final verification content in the figure: it is actually a combination of formulas (19) and (24) in this article, using the assumption: if A c B = 1, then there is a high probability that A = 1 & B = 1. Therefore, equations (19) and (24) can be optimized into a verification equation, that is, (19) c (24) =? 1, if true, then equation (19) =? 1 & (24) =? 1 holds a high probability.

## to sum up

This article mainly shares the implementation details of Range proof based on Bulletproofs. Combined with the previous two articles in this series, I believe that readers can have a relatively deep understanding of the principles behind Range proof. The next article will mainly share the application of Bulletproofs in general computing. thank you all

## appendix

1. Bulletproofs paper: chrome-extension: //cdonnmffkdaoajfknoeeecmchibpmkmg/assets/pdf/web/viewer.html? File = https% 3A% 2F% 2Feprint.iacr.org% 2F2017% 2F1066.pdf

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