| 摘要 |
Disclosed is a proposal for a technique of classifying communication for Layers 1 and 2 or higher, and thereby establishment of a necessary method of safely and simply interchanging a secret key, an authentication method, an error detection method, and a recovery method. It is necessary to decrease the amount of hardware needed for establishing these. We invented a hardware-based method of safely and simply interchanging a key needed for classified connection. A procedure according to the invention interchanges a key using a feature attributed to a classification conversion to which an commutative law is applicable. The procedure can simultaneously confirm normal connection of both outward and homeward routes and is also usable as an DC balanced encoding system as a result of classification. Layers 1 and 2 can be classified because the classified connection is based on hardware. Even if a signal is monitored directly or a generated noise is observed, it becomes difficult to retrieve not only information included in a packet's payload, but also information such as a header and a trailer where information such as a destination, a packet type, etc. is described, and communication state information such as a congestion degree of packets. With respect thereto, we also invented an authentication method, an error detection method, and a method of recovery from an error-detected state.
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