FIELD: physics; communications.
SUBSTANCE: invention relates to identification of multimedia information. The system and method of using desynchronised identification information can be used for audio applications and for video applications and includes embedding functions and detection and extraction functions. Unique keys are associated with each buyer of a copy of digital data. The embedding function includes application of pseudorandom conversion of selected embedding zones. The pseudorandom conversion key is specific for the user. Zones are selected using a secret hash function of the multimedia information. The detection and extraction functions include rough search in a set of user keys. If one of the keys is sufficiently probable, then that user is involved in making illegal copies.
EFFECT: increased number of individuals who should be identified, as well as increased cryptographic protection.
28 cl, 9 dwg
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