Cryptanalysis of the Modified Remote Login Authentication Scheme Based on a Geometric Approach

摘要

In 1995, Wu proposed a remote login authentication scheme based on geometric approach. However, Chien, Jan and Tseng presented a cryptanalysis of Wu's scheme to show that it is not secure. Moreover, they proposed a modified version of Wu's scheme. This paper presents there is a serious weakness in this modified remote login authentication scheme. We show that an illegal user can easily forge a valid login request in the modified version proposed previously.%1995 Wu pasiule geometrine nuotolinio prisijungimo autorizavimo schema. Tačiau Chien, Jan ir Tseng atlikta Wu schemos kriptoanalize parode, kad ši schema nera saugi. Del to jie pasiule modifikuota Wu schemos versija. Šis straipsnis parodo, kad modifikuota nuotolinio prisijungimo autorizavimo schema turi rimtu trukumu: nelegalus vartotojas gali lengvai suklastoti legalaus prisijungimo užklausa.