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increasing for the personel homepage as well as administrative institutions. Also, IETF suggests using DTLS, which can provide a security service to constrained devices with lower CPU power and limited memory space under IoT environments. In this paper, we implement LEA(Lightweight Encryption Algorithm) algorithm and apply it to OpenSSL. The implemented algorithm is compared with other symmetric encryption algorithms such as AES etc, and it shows the superior performance in calculation speed.

This version includes a concrete analysis and supporting simulation results on multi-homed Wireless mesh networks. This research is supported by the Ministry of MKE, Korea, under the "program for CITG" support program supervised by the NIPA (NIPA-2010-0004) and the KCC (Korea Communications Commission), Korea, under the R&D program supervised by the KCA(Korea Communications Agency) (KCA-2011-08913-05001).