Smart card based pre-paid system application using session updated key in 3-DES algorithm


A low-cost pre-paid system employing a symmetric key cryptosystem, namely 3-DES algorithm is developed in this work. The proposed system consists of terminals and smart cards that both contain code-protected microcontrollers. Certain bits of a 3-DES key are updated for each session between the smart card and the terminal. The constant part of the key is… (More)