Multiplex re-routing protection process and transmission system for implementing this process
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United States of America Patent
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Issued Date -
Aug 25, 2005
app pub date -
Dec 20, 2004
filing date -
Dec 19, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a process for protecting against the re-routing of a multiplex transmitted by an operator to at least one subscriber, comprising the following stages: on transmission, associating with said multiplex at least one authentication message protected by a cryptographic function susceptible of being generated exclusively by the operator, associating with said message at least one variable data item the evolution of which over time is pre-defined by the operator, and on reception, analysing the authentication message, authorising access to the multiplex if said message is authentic and integral, and if the evolution of the variable data item is coherent, otherwise, prohibiting multiplex access.
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