Multiple-Use Transferable E-Cash

Abstract

Ecash is a concept of electronic cash which would allow users to carry money in form of digital coins. Transaction can be done both offline and online in absence of a third party/financial institution. This paper proposes an offline model which supports multiple us-age of transferable ecoin. The protocol is based on RSA, digital signature and a two-step encryption process. In this two step en-cryption, the user account details are encrypted in the coin using unique numbers in each step. The first encryption takes place dur-ing the successful receipt of the coin, where a receive end number is used for encryption,which is unique for every receipt. The second step of encryption takes place during successful spending of the coin,where a spending end receive number is used for encryption, which is unique for every spending of the coin. These two unique numbers comprise the major part of encryption in this model, pre-vents double spending and preserves user anonymity.