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In order to overcome vulnerability to eavesdropping of on-off-keying based OCDMA scheme, a new multi-code keying reconfiguration is presented to enhance confidentiality over two dimensional time-spreading and wavelength-hopping (2D TS/WH) optical code division multiple access (OCDMA) schemes. The time-shifted carrier-hopping prime codes (CHPCs) are proposed and assigned as signature address code....
This paper presents a wavelength division multiplexing/spectral amplitude coding system with optical code-division multiple-access, for applications using fiber vibration sensors. The device makes use of fiber Bragg grating (FBG) etching on optical fibers to provide encoding/decoding functionality. According to the orthogonal properties of spectral amplitude coding (SAC) using m-sequence code, the...
Dynamic signature codes reconfiguration is proposed to combat with eavesdroppers to enhance confidentiality over optical code-division multiple-access (OCDMA) networks. The code reconfiguration is achieved by exclusively assigning to each user a set of M codes and randomly selecting one among them to represent each user's signature. A central node station is assumed to monitor network traffic condition...
This paper proposes a fragile watermarking algorithm named compression watermarking algorithm (CWA) which provides compression and authentication functions to apply in MJPEG of video surveillance system. The watermark information is embedded into every 8 times 8 block in the coefficient domain in encoding process and extracted watermark from each 8 times 8 block in the coefficient domain in decoding...
In order to enhance the degree of confidentiality in the last mile access network, a reconfigurable coded wavelength-division-multiplexing Ethernet passive optical network scheme (reconfigurable coded WDM-EPON) is presented to protect against eavesdropper on fiber to the home (FTTH) network. Rather than employing wavelength-hopping, time-spreading or spectral phase coding approaches, which all involve...
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