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Indonesia e-cash system faced with some challenges. Lack of proper network infrastructure impedes the distribution of e-cash throughout the country. Most existing e-cash scheme designed for usage with proper network infrastructure, mainly for validating the transaction. Existing peer-to-peer e-cash scheme also require proper network infrastructure, either for public key request or deposit the received e-cash. This paper proposed a novel ecash scheme by building its e-cash data as chain of transaction (block chain) using identitybased signcryption as its security mechanism. The combination of block chain and identitybased signcryption make the e-cash peer-to-peer, transferable, and able to operate on ad hoc network. The Markov chain evaluation show that the proposed scheme can achieve security against forgery and double spending.

Peer-to-peer Electronic Cash Using Identity Based Signcryption Dany Eka SAPUTRA, Sarwono SUTIKNO, and Suhono Harso SUPANGKAT