Unknown Key-share definition
Unknown Key-share. We examine the unknown key- share attack that allows an adversary E to make one party believe K to be shared with E while it is in fact shared with a different party. A common scenario is that E has XÆ certified without knowing the private key UÆ1 (V), UÆ2 (V) of A, and uses it to talk with B as E while she poses as B to A simultaneously. Our protocol is secure against this attack because for E, we have h(YÆ) h(YB) in computing each K Key Control: As the same argument in the above, the key-control is clearly impossible for the third party. The only possibility of key-control attack may be brought out by the participant of the protocol B. But for the entity B, to make the party, A generate the session key K(Key YB). which is pre -selected value by B, for example B should solve the following K = Key YÆ = Key YB. But this again falls into the problem of RP.