Cloud Computing is the most dynamic field characterized by IT Industry. Most probably every industry, and some parts of it , are migrating their data to the cloud. The cloud has become the part of the critical global infrastructure. Security has become the major concern for this computing environment. The Cloud has the distributed nature, so it has become the target of distributed attacks like DDoS and DoS. DDoS and Simple DoS attack us one of the biggest threat in the Cloud networks which prevents the authorized users from using the Cloud Services. Cloud Servers can be crashed down , when it gets too many unnecessary requests or SYN Packets. So, the appropriate solution must be identified to strengthen the security and privacy of the cloud. In this Paper, we have proposed the algorithm, which uses Hop Count Filter Approach, which can block the spoofed packets and can strengthen the security of the cloud.
A novel series fed dual band stacked microstrip patch antenna (SMPA) offering circular polarization (CP) over wide beam is proposed for Indian regional navigation satellite system (IRNSS). The antenna is designed to function at far apart dual frequencies 1.176 GHz (L5 band) and 2.492 GHz (S band) intended for the receiver terminals of IRNSS system. The dual band performance with large frequency ratio (about 1:2.1) has been obtained by two stacked patches with an air layer between them. The square notches at the corners along the diagonal of lower square patch, one sided corner truncation along the diagonal of upper square patch and feeding along central axis is used to obtain CP (with axial ratio < 2) at both the operating bands. The square patches are excited with novel series feed technique. The proposed novel antenna has been designed, simulated and developed to meet the stringent design requirements for IRNSS navigation system. The antenna has achieved an impedance bandwidth of 2.6% and 2.2% at L5 and S band frequency respectively. It possesses positive gain beamwidth of 120 • and 3 dB axial ratio beamwidth of 120 • and 60 • at L5 and S band frequencies respectively.
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