@ARTICLE{JCS19, author = {Giuseppe Della Penna and Pietro Frasca and Benedetto Intrigila}, title = {Two Factor Authentication for e-Government Services using Hardware-Like One Time Password Generators}, doi = {10.3844/jcssp.2019.171.189}, journal = {Journal of Computer Science}, editor = {Science Publications}, pages = {171--189}, year = {2019}, month = {1}, volume = {15}, number = {1} }