External security module for a television signal decoder

Details External security module for a television signal decoder External security module for a television signal decoder

H - Electricity

04

N

H04N 7/167 (2006.01)

Patent

CA 2049310

A decoder for descrambling encoded satellite transmissions comprises an internal security element (1019) and a replaceable security module (1014). The program signal (SYS) is scrambled with a key (KOMI) and then the key itself is twice-encrypted and multiplexed with the scrambled program signal. The key (KOMl) is first encrypted with a first secrete serial number (SSN1) which is assigned to a given replaceable security module (1014). The key is then encrypted with a second secret serial number (SSN0) which is assigned to a given internal security element (1019). The internal security element (1019) performs a first key decryption using the second secret serial number (SSN0) stored within the internal security element (1019). The partially decrypted key (E SSN1(KOM1)) is then further decrypted by the replaceable security module (1014) using the first secret serial number (SSN1) stored within the replaceable security module (1014). The decoder then descrambles the program using the twice-decrypted key (KOM1). The replaceable security module (1014) can be replaced, allowing the security system to be upgraded or changed following a system breach.

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