Patent ID: 7039191

Claim:
A chaining key broadcasting reception system, comprising: a chaining key reception unit, the chaining key reception unit configured to receive i) a first chaining key to decode, ii) a key identifier identifying the first chaining key, and iii) a target key identifier identifying a second chaining key for decoding the first chaining key; a chaining key decoding unit receiving, as input, the first chaining key; and a chaining key management unit in bi-directional communication with the chaining key decoding unit, the chaining key management unit configured to retrieve a stored second chaining key paired with a stored key identifier matching the target key identifier and then send the retrieved second chaining key to the chaining key decoding unit, wherein, the chaining key decoding unit decodes the first chaining key using the retrieved second chaining key and the chaining key management unit stores the decoded first chaining key paired with the key identifier in a pair.