This paper considers a situation where the copyright of distributed images/photos is violated. Since the images/photos published on social networks or any networks are usually modified and/or compressed to the match the template provided by the service providers, this paper propose a digital image watermarking based on DWT coefficients modification to be used for such images/photos. Basically, there are two parts in the image processing, in the embedding process, the blue component of original host image is decomposed by the Discrete Wavelet Transform (DWT). Then image is transmitted. At the receiver end, original components of the watermark image are extracted by using adaptive mean filter.

Network intrusion detection systems have become intensive application for identifying malicious pattern. Pattern matching is the problem of finding all occurrences of a pattern in a text. Essential to NIDS is the inspecting packets. Now a day’s intrusion detection system plays an important role in network security. As the use of internet is increasing rapidly the possibility of attack is also increasing. People are using signature based IDS, snort is most widely used signature based IDS because of its open source software. In this paper our work concentrates on multi pattern signature and proposes a FPGA based deep packet inspection engine for NIDS.The system can support both dynamic and string pattern matching system. Multi pattern matching involves matching a data item against a large database of signature patterns. String matching is one of the most critical elements because it allows for the system to make decisions based on the actual content. The evaluation on real network environment shows that net FPGA can maintain gigabit line rate throughput without dropping packets.

In digital communication Orthogonal Frequency Division Multiplexing (OFDM) is regarded as a promising technology in recent years. In this paper, propose low power transceiver for OFDM based wireless local area network (WLAN) system using Application Specific Integrated Circuit (ASIC) platform. As per the IEEE standard 802.11a OFDM based transceiver are capable of providing data rates up to tens of Mbps but OFDM transceiver will dissipate huge amount of power. The objective of the work is the optimization with respect to power & area.

In this paper, an adaptive FIR filter hardware architecture with high performance is designed. The RLS (Recursive Least Square) algorithm for adaptive signal processing is explored based on QR decomposition, which uses Givens Rotation algorithm. The Givens Rotation algorithm will be implemented using CORDIC algorithm. This design is suitable for high-speed FPGAs or ASIC design. This QR Design is tested using Xilinx-FPGA as a case study.

This paper proposes a new Stenography method employing quantization table using FPGA .In this method new Vigenere Cipher is been used for encryption and decryption of the secret message. The color transformation techniques can be used to increase the modified coefficients so as to have good capacity and stego-size results. The capacity which is the amount of information embedded in color images increases, with the number of modified quantized DWT coefficients.