| 摘要 |
FIELD: physics, computer engineering.SUBSTANCE: invention relates to controlling access to scrambled content during hierarchical encoding. The hierarchical access control method includes: receiving and transmitting to a protective processor second cryptograms (CW)for i, ranging from 1 to k-1, obtained by encoding control words CW-CWusing corresponding keys K-K, built using at least part of an array formed by data residing in ECM, and an operational key CE; decoding the second cryptograms (CW), only if access conditions CA, obtained in the ECMmessage, correspond to access rules TA, and without preliminary comparison of access conditions CAwith access rules TA for i, strictly less than k, and, otherwise, blocking decoding of the second cryptograms (CW), if access conditions CAdo not correspond to access rules TA.EFFECT: controlling access to content which is encoded and scrambled on component elements in a hierarchical manner with less computational power compared to existing methods.11 cl, 8 dwg |
