RT - Journal Article T1 - A New Electronic Cash Protocol Using a Modified ElGamal and an Untraceable Signature Scheme JF - ITRC YR - 2016 JO - ITRC VO - 8 IS - 2 UR - http://ijict.itrc.ac.ir/article-1-66-en.html SP - 9 EP - 14 K1 - digital signature K1 - blind signature K1 - ElGamal digital signature K1 - RSA K1 - electronic payment system K1 - electronic voting system AB - In this paper, a new transaction protocol based on electronic cash using a modified ElGamal signature and a secure blind signature scheme is proposed. With the extension of untraceable electronic cash, a fair transaction protocol is designed which can maintain anonymity and double spender detection and attaches expiration date to coins so that the banking system can manage its databases more efficiently. The security of the system is based on discrete logarithm problem and factoring problem.Also our protocol has better performance than similar protocols. So the new protocol is very efficient. LA eng UL http://ijict.itrc.ac.ir/article-1-66-en.html M3 ER -