Abstract. MANET security is becoming a challenge for researchers with the time. The lack of infrastructure gives rise to authentication problems in these networks. Most of the TTP and non-TTP based schemes seem to be impractical for being adopted in MANETs. A hybrid keymanagement scheme addressed these issues effectively by pre-assigned logins on offline basis and issuing certificates on its basis using 4G services. However, the scheme did not taken into account the CRL status of servers; if it is embedded the nodes need to check frequently the server's CRL status for authenticating any node and place external messages outside MANET which leads to overheads. We have tried to reduce them by introducing an online MANET Authority responsible for issuing certificates by considering the CRL status of servers, renewing them and key verification within MANET that has greatly reduced the external messages.
Authentication is a key requirement in security of integrated wireless networks. A Mobile Node (MN) requires to be re-authenticated whenever it performs vertical handoff in integrated wireless networks. The re-authentication causes delay in communication. If MN is not re-authenticated, it causes an even more serious problem of unauthorized entry in a network. In order to solve this problem, we have proposed a scheme for seamless vertical handoff. In proposed scheme, MN performs first authentication and gets an Authentication Certificate (AC) from home authentication server. The authentication servers of partner network domains share the public keys of each other. Whenever MN wants to switch its network domain, it shows an AC to authentication server of the target network. This AC is encrypted by private key of issuing server. The target network's authentication server verifies that AC using public key of issuing authority and then authenticates a valid MN. The proposed approach reduces the number of messages, costs less bandwidth for vertical handoff and ensures only authorized entry of a MN from one network to another network.
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