Group-Access Smart Card with Elliptic Curve Cryptosystem

Abstract

The application of Elliptic Curve Cryptosystem has gained more and more attention. ECC uses smaller key size and lower memory requirement to retain the security level and can be a crucial factor in the smart card system. An ECC based implementation of security schemes in smart card system to access coffers is proposed in this paper. For some specific safety consideration, access to coffers by a person is not permissive but a group of authorized people. It involves the problem of secret sharing. The adopted solution of sharing secret is threshold scheme. Every participant possesses a secret shadow, which will be saved in the smart card. After correct reconstructing the shared secrets, it is permissible to access the coffer’s door. For resisting dishonest participants, cheating detection and cheater identification will be included. The user can change his password of smart card freely and need not to memorize his assigned lengthy password and shadow as traditional ID-based schemes makes our implementation much more user friendly.