tcp-inbox

Requirements

Design and implement “Word of Wisdom” tcp server. • TCP server should be protected from DDOS attacks with the Proof of Work (https://en.wikipedia.org/wiki/Proof_of_work), the challenge-response protocol should be used. • The choice of the POW algorithm should be explained. • After Proof Of Work verification, server should send one of the quotes from “word of wisdom” book or any other collection of the quotes. • Docker file should be provided both for the server and for the client that solves the POW challenge

Choosed PoW

Fiat Shamir

In first time I choose this algorithm, why? It have two way communication with multiple round request/response, but this algorithm have same difficile for server and client

Hashcash

This algorithm have all options for Proof of Work protection will work

1. One request - one work (for work server generate randow string and wait client calculate PoW)
2. Algorithm have simpe work for server and difficile for client And other argumend for choose this
3. Algorithm have implementation for Golang

Build & Run server

Build Docker container

docker build -f server.Dockerfile ./ -t nti_server:latest

Run server over docker

docker run -d -p 19777:19777/tcp --name nti_server nti_server:latest

Build & Run client

Build Docker container

docker build -f client.Dockerfile ./ -t nti_client:latest

Run client over docker

docker run --rm -i nti_client:latest ./client post -s host.docker.internal -l %line book of "Word of Wisdom"%  -c %chapter book of "Word of Wisdom"%

for more information send data and flag use command:

docker run --rm nti_client:latest ./client post --help