Cryptography – Cryptanalysis
Patent
1996-11-27
2000-01-18
Barron, Jr., Gilberto
Cryptography
Cryptanalysis
380 16, 380 20, H04N 7167
Patent
active
060163488
ABSTRACT:
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.
REFERENCES:
patent: 4864494 (1989-09-01), Kobus, Jr.
patent: 4908834 (1990-03-01), Wiedemer
patent: 4994925 (1991-02-01), Yamashita et al.
patent: 5513260 (1996-04-01), Ryan
Co-pending application Serial No. 08/499,170 by Pankaj Rohatgi, filed Jul. 7, 1955, entitled A Method And Apparatus For Storing Sensitive Information Securely In A Relatively Insecure Storage Medium, Now Abnd.
Functional Model of a Conditional Access System, EBU Review Technical, Grand-Saconnex, CH, Dec. 21, 1995, pp. 64-77.
Blatter Harold
Bridgewater Kevin Elliott
Deiss Michael Scott
Horlander Thomas Edward
Barron Jr. Gilberto
Burke Alexander J.
Kurdyla Ronald H.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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