This example shows how to use PoW concept to protect server from DDoS attacks. The algorithm is based on SHA-3 family and PoW hashcash because it is the lightweight, simplest and modern proof-of-work algorithm, based firstly on CPU intensive proof of work, but solution can be extended to other PoW algorithms, based on requirements.

• Docker
• Golang

To start server and client with docker, you can use the following commands:

docker-compose up --build

Or it can be started just in separate processes on one host:

go build -o ./build/server ./cmd/server/main.go
go build -o ./build/client ./cmd/client/main.go

And start in different terminals:

./build/server

./build/client

go test ./...

• build - build server and client

make build

• run - start server and client in docker

make dc

• test - run tests server and client with coverage report

make test

• lint - run linter

make lint

• PoW concept
• PoW hashcash
• SHA-3 family
• DDoS attack