Veil: Secure Multi-Party Computation & Encryption Framework

Veil is a Rust-based project that provides a multi-purpose encryption and secret-sharing framework with support for:

• AES encryption
• Hash-based encryption
• String reversal
• Shamir’s Secret Sharing for secure split/combine of secrets
• Multi-party computation (MPC) with secret aggregation over a network

It includes both server and client components with an interactive CLI.

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Table of Contents

• Features

• Installation

• Project Structure

• Usage

  • Start Server
  • Start Client
  • Commands

• Examples

• Shamir’s Secret Sharing

• MPC Aggregation

• License

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Features

• Dynamic encryption selection: aes, hash, reverse
• Secret splitting & combining using Shamir’s Secret Sharing
• Multi-party secret aggregation with XOR-based combination
• Secure network communication over TCP with random salts
• Interactive CLI for easy testing and experimentation

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Installation

1. Clone the repository:

git clone https://github.com/yourusername/veil.git
cd veil

2. Build the project:

cargo build --release

3. Run the project:

cargo run --release

Requires Rust 1.70+ and the tokio async runtime.

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Project Structure

veil/
├── Cargo.toml
├── src/
│   ├── main.rs          # CLI entry point
│   ├── network.rs       # Server & Client networking logic
│   ├── mpc.rs           # Multi-party computation & aggregation
│   ├── secret_sharing.rs# Shamir's Secret Sharing implementation
│   ├── aes.rs           # AES encryption logic
│   ├── hash_and_reverse.rs # Hashing & string reversal encryptors
│   └── lib.rs
└── README.md

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Usage

Start Server

cargo run --release

Server will ask:

Do you want to run as server/node or client?

Type server and provide an address:

127.0.0.1:7878

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Start Client

cargo run --release

Type client and provide server address:

127.0.0.1:7878

Then you can enter commands interactively.

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Commands

aes|text             # AES encrypt 'text'
hash|text            # Hash 'text'
reverse|text         # Reverse 'text'
split|secret|k|n     # Split 'secret' into n shares with threshold k
combine|share1,...   # Combine shares into original secret
mpc|party1,party2|party1,party2 # Aggregate multiple parties' shares

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Examples

AES Encryption:

> aes|hello
Server response: <hex encoded encrypted output>

Reverse Encryption:

> reverse|hello
Server response: olleh

Hash Encryption:

> hash|hello
Server response: <sha256 hash in hex>

Secret Sharing (Split):

> split|mysecret|3|5
Server response: 5 hex-encoded shares separated by commas

Secret Sharing (Combine):

> combine|share1,share2,share3
Server response: mysecret

MPC Aggregation:

> mpc|party1share1,party1share2|party2share1,party2share2
Server response: <hex aggregated secret>

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Shamir’s Secret Sharing

Veil uses Shamir’s Secret Sharing scheme to securely split secrets into shares:

• k = minimum threshold to reconstruct secret
• n = total number of shares

All shares are hex encoded for network transmission. Combining any k valid shares will reconstruct the original secret.

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MPC Aggregation

• Accepts multiple parties, each providing multiple shares
• Aggregates secrets using XOR across parties
• Returns a single hex-encoded aggregated secret
• Supports secure collaborative computation without revealing individual secrets

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Output

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License

MIT License.