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