# BLCred

**Repository Path**: luczydoge/BLCred

## Basic Information

- **Project Name**: BLCred
- **Description**: implement of paper `BLCred: A Credential-Based Anonymous and User-Centric Identity Management Protocol in Distributed Ledgers`
- **Primary Language**: Shell
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-04-30
- **Last Updated**: 2022-05-20

## Categories & Tags

**Categories**: Uncategorized

**Tags**: 区块链, hyperledger-fabric

## README

# BLCred

> implement of paper `BLCred: User-Centric Decentralized Identities with Anonymity and Accountability atop Distributed Ledgers`

---

## Offline version

> An half on-chain implement of BLCred system based on python. blockchain is only responsible for recording credentials.

### Prerequisites and setup:

(All available at Pypi)

* [bplib](https://github.com/gdanezis/bplib)
* [petlib](https://github.com/gdanezis/petlib)

``` bash
export OPENSSL_CONF=/usr/local/ssl/openssl.cnf
sudo apt-get install libssl-dev
pip3 install petlib
pip3 install bplib
```


All the algorithm has been implemented as `Lib*.py` in folder `/BLCred_offline/lib/`

`BLCred.py` will call them and complete a typical usage process.

### to run the project

``` bash
cd BLCred_offline
python3 BLCred.py
```

## Online version

> An completely on-chain implement of BLCred system with HyperlederFabric based on go and nodejs

### Prerequisites and setup:

* go 1.13.4
* nodejs 8.10.0 & npm 3.5.2
* docker 20.10.0
* Fabric 2.2.0

You can find a basic tutorials on environment configuration here: [Getting Started](https://hyperledger-fabric.readthedocs.io/en/latest/getting_started.html)

we use a third party [bilinearity lib](https://github.com/drbh/zkproofs/tree/master/go-ethereum/crypto/bn256) instead of `bn256` of go language, install it with

```bash
go get github.com/drbh/zkproofs/go-ethereum/crypto/bn256
```

### to run the project

```bash
cd BLCred_online/app
./startFabric.sh
./testBLCred.sh
./stopFabric.sh
```

`startFabric.sh` will start a Fabric network and install the chaincode, then `testBLCred.sh` will execute the NodeJS scripts: `enrollAdmin.js`, `registerUser.js`, and `invoke.js` will execute the chaincode functions.

If all goes well, it will print the time spent by each chaincode function