KEYWORDS: Telecommunications, Free space optics, Computer security, Sensors, System identification, Information security, Network security, Modulation, Radio optics, Transmitters
A free space optics based identification and interrogation system has been designed. The applications of the proposed
system lie primarily in areas which require a secure means of mutual identification and information exchange between
optical readers and tags. Conventional RFIDs raise issues regarding security threats, electromagnetic interference and
health safety. The security of RF-ID chips is low due to the wide spatial spread of radio waves. Malicious nodes can read
data being transmitted on the network, if they are in the receiving range. The proposed system provides an alternative
which utilizes the narrow paraxial beams of lasers and an RSA-based authentication scheme. These provide enhanced
security to communication between a tag and the base station or reader. The optical reader can also perform remote
identification and the tag can be read from a far off distance, given line of sight. The free space optical identification and
interrogation system can be used for inventory management, security systems at airports, port security, communication
with high security systems, etc. to name a few. The proposed system was implemented with low-cost, off-the-shelf
components and its performance in terms of throughput and bit error rate has been measured and analyzed. The range of
operation with a bit-error-rate lower than 10-9 was measured to be about 4.5 m. The security of the system is based on the
strengths of the RSA encryption scheme implemented using more than 1024 bits.
F. Albus, Foerd Ames, H.-J. Kluge, S. Krass, F. Scheerer, B. Suri, A. Venugopalan, R. Deissenberger, S. Koehler, J. Riegel, N. Trautmann, Franz-Josef Urban, Roland Kirchner
Resonance ionization of atoms confined in a hot cylindrical cavity is a very efficient and selective technique for
trace analysis. Several applications of this method have been tested or are presently under investigation. An
efficiency of 14% was obtained for technetium. An efficient path for rnance ionization of tin was found, leading
to an autoioniing state at 59375.9 cm1. The high efficiency makes the baer ion source suitable for trace analysis
of actinides in the environment. In all cas surface-ionized background has to be suppresoed to avoid isobaric
interferences. Therefore a new laser ion source has been developed with a cavity made ofextremely pure pyrolytically
coated graphite.
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