Protocolo Seguro Baseado em Moeda Eletrônica para Troca de Cartas em Jogos de Cartas Colecionáveis P2P (A Secure Protocol for Exchanging Cards in P2P Trading Card Games Based on Transferable E-Cash)

Marcos Vinicius Maciel Silva (, Marcos Antonio Simplicio Junior (

1Universidade de São Paulo

This paper appears in: Revista IEEE América Latina

Publication Date: July 2017
Volume: 15,   Issue: 7 
ISSN: 1548-0992

Trading card games (TCG) differ from traditional card games mainly because the cards employed are not shared among players in a match. Instead, users play with the cards they own (e.g., purchased or traded with other players), which corresponds to a subset of all cards produced by the game provider. Even though most computer-based TCGs rely on a trusted third-party (TTP) for preventing cheating during trades, allowing them to securely do so without such entity remains a challenging task. Potential solutions are related to e-cash protocols, but, unlike the latter, TCGs allow users to play with the cards under their possession, not only to pass those cards over. In this work, we present the security requirements of TCGs and how they relate to e-cash. We then propose a concrete, TTP-free protocol for anonymously trading cards, using as basis a secure transferable e-cash protocol.

Index Terms:
Trading card game, e-cash, cryptology   

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