The resonant excitation of metal-clad modes, including fundamental and higher-order modes, in a multilayer structure deposited on the polished cladding of a single-mode optical fiber is theoretically analyzed and experimentally demonstrated. The excitation of metal-clad modes is shown as a resonant power transfer from the fiber to the metal-clad mode that takes place for an external refractive-index value such that the effective index of the metal-clad mode reaches the cladding level. The observed attenuation on the TM polarization provides a suitable transducing mechanism for refractive-index sensor devices as well as the principle for developing tunable wavelength-polarized filters with a wide range of optical performance characteristics.
PurposeThe purpose of this paper is to develop an efficient tool to ensure traceability data entry based on RFID and improve the detection of fakes inside the supply chain.Design/methodology/approachFirst, the authors put forward a secure traceability system with a cryptographic operator that improves efficiency, saves costs and is adaptable to all types of supply chains. Second, the authors implement the system in a food manufacturing company, show the compatibility of the system with the initial production chain and demonstrate its improvement.FindingsThe authors have economically and technologically improved the detection of faked goods in the supply chain by means of a cheap and scalable system based on RFID.Research limitations/implicationsThe system has been tested in a manufacturing point of the supply chain, not in the supply chain as a whole. As traceability is additive in character, the results can be generalized and applied to each part of the supply chain.Practical implicationsA prototype has been built and implemented for a food manufacturing company. It meets all the specifications required for detection of fakes in manufactured products.Originality/valueUnlike other existing products used to detect fakes through traceability, this system identifies fakes and potential counterfeits, significantly reducing the cost of security management. Another important difference is that verification can be performed by a third party not involved in the system, without loss of security.
The increase of Internet penetration in the last years is boosting the popularity of eVoting systems. However, in order to have a security level similar to that of an in-person voting, a series of security requisites have to be accomplished. This article describes a secure eVoting protocol based on ring signatures. The implementation details and the different modules of a voting platform including this signature protocol are presented. In addition, a special characteristic has been included in the voting protocol: during the signature process a parameter called "linking tag" is generated, able to identify the different votes sent by a single voter during a voting process. This characteristic makes it interesting in e-Cognocracy and Quality of Experience evaluation scenarios.
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