METHOD AND DEVICE FOR GUARANTEEING THE INTEGRITY AND AUTHENTICITY OF A SET OF DATA

摘要

In order to guarantee the integrity and the authenticity of the data
transmitted into a
control center and one or more receiver units, each receiver unit includes a
decoder
(IRD) and a security unit (SC) and also a means of communication (NET, REC)
with
the control center.

The method consists of calculating a check information (Hx) representative of
the
result of a so-called mono-directional and collision-free function, carried
out on all or
only a part of the data transmitted and to transmit the result to the control
center for
verification.

The center may inform the decoder on the authenticity of the data along the
return
paths or the main path.