scottocs/OFE-ABE

File structure

A publicly verifiable optimistic fair exchange protocol using decentralized CP-ABE

newma.py: decentralized CP-ABE with sigma protocol Fair exchange protocol based on Rouselakis and Waters's Efficient Statically-Secure Large-Universe Multi-Authority Attribute-Based Encryption.

Alice.py: the player Alice

Bob.py: the player Bob

ExternalUser.py: an external user (optional) who can verify all public information

Prerequisition:

1). pbc, gmp
2). Charm-crypto at: https://jhuisi.github.io/charm/index.html
3). gmpy2

Test case (with 100 arbiters):

1. open two terminal windows.
2. run "python3 Alice.py 100" and "python3 Bob.py 100" in each terminal.
3. accomplish the exchange protocol step by step.
4. result:    
    ![demo](images/demo.gif)
5. (optional) through running "python3 ExternalUser.py", an external user can verify all public information. 

Note

All codes provided in this github are a proof of concept implementation of optimistic fair exchange protocol and are not audited for implmentation bugs. Use with caution.