H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 7/00 (2006.01) H03M 7/14 (2006.01)
Patent
CA 2567229
A method of scrambling a stream of data includes obtaining from the stream a succession of first sequences (29,30) of blocks (P i) of data, reversing the order of the blocks (P i) in each of the first sequences (29,30) of blocks to form respective second sequences (31,37) of blocks of data, and encrypting the blocks in each second sequence (31,37) of blocks using a cipher (E K) in block chaining mode, initialised with a respective initialisation vector (IV3,IV N) for each second sequence (31,37) of blocks. For a succession of first sequences (29,30) of blocks included in a unit (26) of data within the stream, at least one initialisation vector (IV N) for encrypting a second sequence (37) of blocks formed from a first sequence (30) of blocks in the unit is generated in dependence on at least one block in a preceding first sequence (29) of blocks of the unit.
Gowling Lafleur Henderson Llp
Irdeto Access B.v.
LandOfFree
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