Security and performance are most essential and prime challenges for networking phenomenon. Computation on the remote host is generally done through links. Thus security is needed when the code is on the way to the destination host. A program travelling over the link is extremely venerable to be forged for malfunctioning. On the other hand Software's are commonly distributed with all information in the code itself, for example java byte codes. Byte codes are easy to reverse engineer. Any rival company may get the algorithms and techniques used in the product. Therefore a protection is needed to keep information secret. In both the cases obfuscation seem to be promising solution to the problem. Obfuscation makes code less understandable without changing its functionality. In this paper we have proposed an obfuscator that converts source code of a mobile agent into unintelligible code. Whole paper mainly focuses on obfuscating mobile agents whereas the technique can be used for any software obfuscation.
Sampling frequency offset (SFO) is an important issue in the tactical sensor network (TSN) based visible light communication (VLC) systems in Tactical Sensor Network. A digital interpolation can be used to effectively compensate the SFO. In such case, oversampling at the receiver ADC is required to mitigate the aliasing effect due to imperfect DACs and nonlinearity of visible light sources that cause extra frequency components inside/outside the signal spectrum. The oversampling factor is mainly determined by the order of the digital interpolation filter and TSN links. The design of the TSN-VLC receiver incorporating the digital interpolation filter is vital as it affects not only the transmission performance but also the complexity of signal processing. To evaluate the feasibility of the digital interpolation-based SFO compensation schemes for cost-sensitive TSN applications. Based on the real-time VLC tactical sensor network, the comparison in the VLC-TSN transmission performance and DSP complexity between different interpolation-based SFO compensation schemes is analyzed.
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