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ECMA-368 (European Computer Manufacturers Association) Standard specifies the ultra wideband MAC (medium access control) sublayer for a high-speed short range wireless network. This Standard specifies a 4-way handshake mechanism to guarantee secure data transmission; however, it also provides opportunities for hackers to produce DoS (denial of service) or DDoS (distributed DoS) attacks. The paper outlines two scenarios where it is possible to produce DoS and DDoS attacks to 4-way handshake of ECMA-368 standard while two solutions are given respectively. The first DoS attack will consume system's resources such as CPU and memory resources. The solution successfully prevents the first DoS attack. The second attack deprives the legitimate device of the possibilities to build secure relationship and the solution suppresses the hackers' behavior. The solutions increase the security of ECMA-368.