Denial of Service Attack Feasibility Sample Clauses

Denial of Service Attack Feasibility. Xxxxxxx et al.’s [11] protocol uses a temporary ID for the patient, which is to provide message freshness based on session dependent timestamp T1. The usage of the temporary ID is to provide anonymity of patient, which claimed to be one of important factors in Xxxxxxx et al.’s [11] protocol. However, TS should have big overhead to compute any legal patient A’s ID in the verification phase of Mahmood et al.’s [11] protocol, which results to be in denial of service. The reason is that TS requires to decrypt CA to get (XA||PA||T1) with KA−TS. However, for the operation, TS should choose a proper pre-shared key after identifying the patient with XXX∼T. Note that there are no ways that TS could know the patient ID,XXX∼T in Mahmood et al.’s [11] protocol. The ID could be obtained only by taking hash operation of XA, PA and N1. Xxxxxxx, there is only possibility that TS to retrieve XXX∼X is by performing hash operations of all patients, which results in denial of service. TS works the main role for the authentication in Mahmood et al.’s [11] protocol and there are not only one request for authentication in a certain period of time but should be many requests at the same time.