A simple implementation for blockchain using my previous ECC algorithm. In Dev 2022.
It uses my previous package github.com/mcxxmc/simple-implmentation-ecc for the
calculation over finite field, the implementation of elliptic curve and the ECDH
process (including gcm encryption and decryption).
It consists of 3 parts: blockchain, client and datacenter.
datacenter is the simulation part. This project is not aimed at the
simulation of any kind of cryptocurrency. Its main purpose is to simulate the
usage of blockchain technology in the data storage, which is immutable and secure after
creation by the nature of blockchain.
Users can register themselves at the "datacenter", and the "datacenter" is therefore like a phone book. It distinguishes each user by their "phone number" (a unique id) instead of their public keys (the public keys are used as unique ids by many cryptocurrencies, though).
update: now public keys are unique too.
TODO:
a complete verification system.
A real world example of identity verification using ecc is that, a buyer from the other party can use your phone number (unique id) to verify your ownership of certain asset, without seeing the traditional official paper, which prevents potential leak of privacy. However, the buyer should also have registered in the datacenter (owning a public key) and agrees on the same elliptic curve. The mathematics secret behind this mechanism is:
buyer's privKey * your PubKey = buyer's privKey * your PubKey from datacenter = buyer's pubKey * your privKey
note that during that exchange process, the buyer doesn't send the calculated shared key to the seller; he/ she receives the shared key from the seller and compare. If they match, then the seller's identity is verified.
This is a very simple implementation and have fun!