Session-key Problem Sample Clauses

Session-key Problem. ⊕ ⊕ In Xu et al.’s protocol, the session key can be computed as k = rMN rF A by MN and FA, respectively. However, the mutual authentication between MN and FA must re- sort to the assistance of the corresponding HA. However, in the mutual authentication phase of Xu et al.’s protocol, HA can recover the rMN and rF A from the authentication request. Therefore, HA also has a capability to compute the session key k = rMN rF A. It is well known that this session key is used to encrypt all messages in the communication session between MN and FA. We can see that the protocol of Xu et al. merely provided the session key agreement. However, they cannot guarantee the con- fidentiality of the session key. As to many applications, there are potential risks. That is, the design in Xu et al.’s protocol is actually insecure and infeasible.
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