https://github.com/simonskodt/secu1-virtual-dice

The second mandatory hand-in in Security 1. Implementing a protocol that allows Alice and Bob to roll a virtual dice over an insecure network even though they do not trust each other.
https://github.com/simonskodt/secu1-virtual-dice

commitment-schemes golang multiparty-computation sha256-hash tls-certificate

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The second mandatory hand-in in Security 1. Implementing a protocol that allows Alice and Bob to roll a virtual dice over an insecure network even though they do not trust each other.

• Host: GitHub
• URL: https://github.com/simonskodt/secu1-virtual-dice
• Owner: simonskodt
• License: mit
• Created: 2022-10-09T13:10:52.000Z (about 2 years ago)
• Default Branch: main
• Last Pushed: 2022-10-25T12:28:13.000Z (about 2 years ago)
• Last Synced: 2023-03-05T07:05:01.507Z (over 1 year ago)
• Topics: commitment-schemes, golang, multiparty-computation, sha256-hash, tls-certificate
• Language: Go
• Homepage:
• Size: 634 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Mandatory Hand-in 2: Virtual dice

**The second mandatory hand-in in Security 1.**

## Purpose

In a peer-to-peer network, the assignment is to implement a coin-flipping protocol that allows Alice and Bob to roll a virtual dice over an insecure network (assumption: they do not trust each other). The commitment scheme is hash-based, and this ensures that the chosen statement is hidden from every node in the network, but at a later point, this statement can be revealed.

## How to run

Open two terminals that represent Alice and Bob respectively. The format of the command-line input is

```cmd

go run .  :  

```

Here, the flag should only be set on one of the nodes, preferably Alice. This flag expects a boolean value afterwards which here should be `true`.  If none are given, then the default value is `false`.

**Expected command-line input**

```cmd

Alice’s terminal: go run . -init true :9000 9001 Alice

Bob’s terminal:   go run . :9001 9000 Bob

```

This exact input is given in the script [run_split.ps1](./src/run_split.ps1) which creates the two PowerShell terminal instances next to each other (shown below).

![command line excution](./img_run.png)

## Errors

Since we are dealing with GRPC, Googles RPC framework, that connects services, sometimes errors occur.

### RPC error

**Error on server :: rpc error: code = Unavailable desc = connection error: desc = "transport: Error while dialing dial tcp [::1]:9001:**

This happens when the Bob server takes too much time loading up. Close terminal, and try again.

### Usage of more than one socket address

**Server failed to listen af port :9001 :: listen tcp :9001: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.**

If a previous terminal instance is not closed, then the error message of multiple socker address usage is shown. Close both terminals, and try again.