5. In a mobile roaming system, there are three entities: a mobile user U, its home server H, and a foreign server V. The mobile user U, who is subscribed to the home server H, is currently in a foreign network administered by the foreign server V. There is a direct link between U and V, and another direct link between V and H. However, there is no direct link between U and H . In order to obtain the services provided by V, U must be authenticated by V (with the help from H). Suppose that the mobile user U shares a symmetric key K UH with its home server H. The home server H and the foreign server V also have public keys PK H and PK V that are certified by a trusted CA (H and V both have certificates) . You task is to design a secure authentication and key establishment protocol which can satisfy the following security requirements. a. User authentication: the foreign server must be sure that U is a legitimate subscriber of H . Stuck with a lot of homework assignments and feeling stressed ? Take professional academic assistance & Get 100% Plagiarism free papers Get A Free Quote b. Server authentication: the user must be sure that V is indeed the real foreign server . (In the view of the user, the foreign server is V) c. Secure key agreement: U and V will establish a fresh session key at the end of the protocol. The session key can only be known by U and V (i.e., H cannot know the session key). d. Anonymity & unlinkability: Besides the user and the home server, no one including the foreign server can tell the real identity of the user (i.e., the foreign server V only knows that U is a valid user of H, but does not know U ’ s real identity) or link two sessions belonging to the same user. You can assume that all the entities (H, V, and U) can perform public key operations. However, only H and V have certified public keys . Describe each step of your protocol clearly and then provide justifications for each of the security requirements given above. Write My Assignment Hire a Professional Essay & Assignment Writer for completing your Academic Assessments Native Singapore Writers Team 100% Plagiarism-Free Essay Highest Satisfaction Rate Free Revision On-Time Delivery
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