Systems including both distributed and centralized architectures for providing multiple levels of security using "virtual" switches. Ports and channels are assigned the same time slots on a TDMA bus only when they have matching security levels.

 
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< Authentication of an object using a signature part

< Printing management system, printing apparatus, print information output apparatus, and printing method

> Method of obscuring cryptographic computations

> Squared Weil and Tate pairing techniques for use with elliptic curves

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