Asynchronous Challenge-Response Authentication Solution Based on Smart Card in Cloud Environment

In order to achieve secure authentication, an asynchronous challenge-response authentication solution is proposed. SD key, encryption cards or encryption machine provide encryption service. Hash function, symmetric algorithm and combined secret key method are adopted while authenticating. The authentication security is guaranteed due to the properties of hash function, combined secret key method and one-time authentication token generation method. Generate random numbers, one-time combined secret key and one-time token on the basis of smart card, encryption cards and cryptographic technique, which can avoid guessing attack. Moreover, the replay attack is avoided because of the time factor. The authentication solution is applicable for cloud application systems to realize multi-factor authentication and enhance the security of authentication.