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Optical burst switching (OBS) technology has been proposed as a promising switching solution for the terabit bandwidth utilization in next-generation wavelength division multiplexing (WDM) optical transport network. Control architecture and Contention resolution are the main issues faced by the Optical Burst Switching networks. This paper only taking care of the Contention problem and to overcome this issue we propose Pre-Deflection Routing with blocking probability estimation Scheme for Optical Burst Switch Networks. In this paper Pre-deflection routing approach has been proposed in which routing is carried out in two ways, Shortest Path First (SPF) and Least Hop First (LHF) Routing to forward the clusters and canoes respectively. Hereafter blocking probability estimation Scheme has been proposed where a forward control packet collects the congestion price and contention price along its paths. If the contention is very high at some particular core nodes then it drops that node and thereafter source node uses this information to revise its burst length and offset time.

Improved BEMD steganographic algorithm to hide secret text behind cover pixels of image to increase security of digital communication for exchanging private information worldwide using binary coefficient and modulus is proposed. From simulation results, Stego image quality better than 70dB which is higher than BEMD Kuo-Chang scheme thereby reducing mean square error difference between cover image and stego image.

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