Method for protected storage of encrypted data on personal digital recorder. RU patent 2315440.

FIELD: engineering of receiving devices/decoders with conditional access, in particular, receiving devices, having memory devices, for example, hard drives.

SUBSTANCE: method for recording content, encrypted with control words (CW) in module of receiving device/decoder (STB), connected to protection module (SC), wherein aforementioned control words (CW) in the same manner as privileges, required for access to aforementioned content, are transferred by means of control messages (ECM, EMM), where aforementioned control messages are encrypted by means of system keys (TK, RK), and aforementioned system keys are used jointly by a set of modules of receiving devices/decoders (STB), includes following stages: encrypted content is saved together with control messages (ECM, EMM) in memory device; system keys (TK, RK) are encrypted locally by means of a predetermined local key (S1), located in protection module (SC); system keys (SK) are saved in memory device in encrypted form after their encryption with aforementioned local key (S1).

EFFECT: increased level of protection.

7 cl, 2 dwg

IPC classes for russian patent Method for protected storage of encrypted data on personal digital recorder. RU patent 2315440. (RU 2315440):

H04N7/16 - Analogue secrecy systems; Analogue subscription systems

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