This paper is directed towards the development of an improved DES to secure the data using smart cards. An improved Data Encryption Standard has been developed by incorporating an ODD/EVEN bit conversion to the existing DES algorithm. The proposed algorithm is expected to provide greater security to further protect the data in Smart Cards. The data is secured from any illegal retrieval and intended modification. The program simulation also provides a good start to explore for a more robust encryption technique that will not require so much mathematical computations.