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| Data control system in CDMA mobile communication system |
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| Remote telephone call notification system |
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Decoding system and data format for processing and storing encrypted broadcast, cable or satellite video data
| Details |
Inventors: Blatter, Harold; Horlander, Thomas Edward; Bridgewater, Kevin Elliott; Deiss, Michael Scott;
Assignee: Thomson Consumer Electronics, Inc. (Indianapolis, IN)
Primary Examiner: Barron, Jr.; Gilberto
Assistant Examiner:
Attorney, Agent or Firm: Tripoli; Joseph S., Kurdyla; Ronald H., Burke; Alexander J.
A decoder conditional access system incorporates different encryption systems for providing access to programs derived from different sources. A conditional access processor for processing encrypted program data and an associated encryption code includes a first algorithm means for decrypting the encryption code to provide an encryption key. The conditional access processor also includes a second algorithm means for encrypting the encryption key and the second encryption algorithm is different to the first encryption algorithm. A datastream representing the program is generated from encrypted program data and an associated encryption code. The encryption code is decrypted to provide an encryption key using a first algorithm. The encryption key is encrypted using a second algorithm different to the first encryption algorithm and the program datastream is formed from the encrypted program data and the encrypted encryption key. The program datastream is decrypted by selecting between a first and a second decryption algorithm and by decrypting the encryption code to provide an encryption key. The encryption key is used to decrypt the encrypted program. A storage medium data format for recording encrypted program data is also disclosed. |
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DETAILED DESCRIPTION In decoder systems that process programs in encrypted form, one technique used to maintain encryption code security involves changing encryption algorithms and encryption keys on a periodic or other basis.
Such a change in algorithm is typically initiated by a service provider in order to safeguard encryption system security and prevent code-breaking and unauthorized program access.
The inventors have hereby recognized that the use of an encryption system involving changing encryption algorithms and encryption keys poses a problem for storage of programs in encrypted form.
Specifically, a program stored in encrypted form along with an associated broadcast encryption key may not be able to be decrypted once encryption algorithms have been updated.
A new encryption algorithm is not compatible with an earlier stored encryption key.
Consequently, a stored encrypted program cannot be decrypted and is unusable once algorithms have been changed.
In order to overcome this problem, another algorithm is advantageously incorporated in a decoder conditional access system.
The conditional access system operates differently in providing access to programs derived from a "live" source e.
g.
a contemporaneous broadcast, than for programs derived from a local storage source e.
g.
a storage medium.
A conditional access processor for processing encrypted program data and an encryption code includes a first algorithm means for decrypting the encryption code to provide an encryption key.
The conditional access processor also includes a second algorithm means for encrypting the encryption key and the second encryption algorithm is different to the first encryption algorithm.
In a feature of the invention, a method for generating a program representative datastream from encrypted program data and an associated encryption code involves decrypting the encryption code to provide an encryption key using a first algorithm.
The encryption key is encrypted using a second algorithm different to the first encryption algorithm, and the program datastream is formed from the encrypted program data and the encrypted encryption key
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Ring Tones 
