E-tickets validation protocols in mobile environment MSS : verification server maintains a list of E-tickets validated by it. MH : submit the E-ticket E-ticket validation problem : validation proce ss The same sequence of an E-ticket should not g et validated more than once . An E-ticket should get validated at least onc e. That is, at least one MSS should accept th is sequence of an E-ticket.
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E-tickets validation protocols in mobile environment MSS : verification server maintains a list of E-tickets validated by it. MH : submit the E-ticket.
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E-tickets validation protocols in mobile environment
MSS : verification server maintains a list of E-tickets validated by it.
MH : submit the E-ticket
E-ticket validation problem : validation process The same sequence of an E-ticket should not get validat
ed more than once. An E-ticket should get validated at least once. That is, at
least one MSS should accept this sequence of an E-ticket.
E-tickets validation protocols in mobile environment
E-ticket problem can be defined in short by the following two properties:
(P.1) If a MSS accepts the E-ticket T and it does not crash, then no other MSS accepts T and a MSS does not accept the same E-ticket more than once.
(P.2) Let δ(T) be the set of MSSs that validate the same E-ticket T. If not all MSSs in δ(T) crashes then there is at least one MSS in δ(T) that accepts T.
E-tickets validation protocols in mobile environment
Two Phase E-ticket Validation Protocol (TPEP) Flat scheme algorithm
The MSS sends an inquiry to all other MSSs in the system visited by the MH, and it validates an E-ticket if none of the responses received from all other MSSs for the same E-ticket is negative.
Phase II It only starts if the MSS gets at least one negative ackno
wledgment. When more than one MSS tries to validate an E-ticket in Phase II, the MSS that is in the same cell as the MH will validate the E-ticket and all others will reject it.
Two Phase E-ticket Validation Protocol
At the end of the protocol, the MSS Si informs the decision on the validation of the E-ticket T to the mobile host, Hi, holding T.
If Hi is disconnected, Si waits for the reconnection of Hi and delivers the message.