Scramble/descramble method and apparatus for data broadcasting

• US 5,917,915 A
• Filed: 06/20/1995
• Issued: 06/29/1999
• Est. Priority Date: 06/24/1994
• Status: Expired

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hirose, Masaki
• Primary Examiner(s): Gregory, Bernarr E.
• Application Number:
  US08/492,643
• Time in Patent Office: 1,470 Days
• Field of Search: 380/4, 380/9, 380/10, 380/16, 380/18, 380/28, 380/49, 380/50, 380/23, 348/6, 348/7, 348/10, 455/3.1, 455/3.2, 455/4.1, 455/4.2, 455/6.1, 455/6.3
• US Class Current: 380/228
• CPC Class Codes: H04B 7/18593 Arrangements for preventing unauthorised access or for providing user protection arrangements for secret or secure communication H04L9/00
• CPC Class Codes: H04H 20/74 of satellite networks
• CPC Class Codes: H04H 20/79 using downlink of the CATV systems, e.g. audio broadcast via CATV network
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving
• CPC Class Codes: H04H 60/15 on receiving information
• CPC Class Codes: H04H 60/23 using cryptography, e.g. encryption, authentication, key distribution
• CPC Class Codes: H04H 60/94 Telephonic networks for accessing the Internet H04H60/84
• CPC Class Codes: H04K 1/02 by adding a second signal to make the desired signal unintelligible
• CPC Class Codes: H04L 9/0827 involving distinctive intermediate devices or communication paths network architectures or network communication protocols using different networks H04L63/18
• CPC Class Codes: H04L 9/3226 using a predetermined code, e.g. password, passphrase or PIN network architectures or network communication protocols for supporting authentication of entities using passwords in a packet data network H04L63/083
• CPC Class Codes: H04N 21/2351 involving encryption of additional data arrangements using cryptography for the use of broadcast information or broadcast-related information H04H60/23
• CPC Class Codes: H04N 21/4353 involving decryption of additional data arrangements using cryptography for the use of broadcast information or broadcast-related information H04H60/23
• CPC Class Codes: H04N 21/8126 involving additional data, e.g. news, sports, stocks, weather forecasts
• CPC Class Codes: H04N 7/163 by receiver means only
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

A transmitter for transmitting news data via satellite and which includes an information storage unit for storing news data, an information scramble processing unit for scrambling the news data using a predetermined first key to output once scrambled news data, a data scrambler for scrambling the once scrambled news data using a predetermined second key and outputting twice scrambled news data, a transmitter for broadcasting the twice scrambled news data via a transmitter antenna to a receiver which includes a data descrambler for descrambling the twice scrambled news data using the second key and outputting once descrambled news data, a storage medium for storing the once descrambled news data, an information descramble processing unit for reading the once descrambled data from the recording medium and descrambling the once descrambled news data using the first key to produce fully descrambled news data, and a user terminal for reading the fully descrambled news data.

Claims

1. A data transmitting apparatus for transmitting predetermined data, comprising:

partial scramble means for scrambling a selected portion of the predetermined data using a first key;

entire scramble means for entirely scrambling all of the predetermined data, using a second key, after the selected portion has been scrambled;

sending means for transmitting the entirely scrambled predetermined data via a first transmission path; and

means for sending the first key via a second transmission path.

2. A data transmitting apparatus as claimed in claim 1 wherein:

the predetermined data comprises news data.

3. A data transmitting apparatus for transmitting predetermined data according to claim 1 wherein the first transmission path comprises circuitry for transmitting the entirely scrambled data via satellite.

4. A data transmitting apparatus as claimed in claim 3 wherein the second transmission path comprises a data storage medium.

5. A data transmitting apparatus as claimed in claim 4 wherein the data storage medium comprises an integrated circuit card.

6. A data receiving apparatus for receiving predetermined data via a first transmission path, the predetermined data having a portion which has been scrambled using a first key and thereafter entirely scrambled using a second key, comprising:

entire descramble means for descrambling the entirely scrambled predetermined data using the second key; and

partial descramble means for selectively descrambling the portion of the predetermined data using the first key.

7. A data receiving apparatus as claimed in claim 6, further comprising:

storage means for storing the predetermined data descrambled by the entire descramble means; and

wherein the partial descramble means descrambles the portion of the predetermined data stored in the storage means.

8. A data receiving apparatus as claimed in claim 6 further comprising means for receiving the first key via a second transmission path.

9. A data receiving apparatus as claimed in claim 8 wherein the second transmission path comprises a data storage medium for storing the first key;

and further comprising;

a reader for reading the first key from the data storage medium.

10. A data receiving apparatus as claimed in claim 9 wherein the data storage medium comprises an integrated circuit card.

11. A data receiving apparatus as claimed in claim 10 further comprising:

an identification storage means for storing unique identification data;

wherein the data storage medium further comprises means for storing preselected identification data; and

wherein the reader includes means for comparing the unique identification data stored in the identification storage means with the identification data stored in the data storage medium and will only read out the first key from the data storage medium when the unique identification data stored in the identification storage means is the same as the identification data stored in the data storage medium.

12. A data transmission system comprising:

a transmitter for transmitting news data via satellite wherein the transmitter comprises;

an information storage unit for storing news data;

an information scramble processing unit for scrambling the news data using a predetermined first key to produce and output once scrambled news data;

a data scrambler for scrambling the once scrambled news data using a predetermined second key and outputting twice scrambled news data;

a transmitter for broadcasting the twice scrambled news data via a transmitter antenna; and

a receiver for receiving the twice scrambled news data transmitted via the satellite, wherein the receiver comprises;

a data descrambler for descrambling the twice scrambled news data using the second key and outputting once descrambled news data;

a storage medium for storing the once descrambled news data;

an information descramble processing unit for reading once descrambled data from the recording medium and descrambling the once descrambled news data using the first key to produce fully descrambled news data; and

a user terminal for reading the fully descrambled news data.

13. A method of transmitting news data which includes either or both of text data or graphical data via a broadcast satellite comprising the steps of:

storing the news data in a storage medium;

retrieving the news data from the storage medium;

encoding the news data once, using a first key, to produce once encoded data;

encoding the once encoded data, using a second key, to produce a twice encoded data signal; and

broadcasting the twice encoded data signal via the broadcast satellite.

14. A method of receiving news data via a broadcast satellite comprising the steps of:

receiving twice encoded data via the broadcast satellite;

decoding the twice encoded data using a second key to produce once encoded data;

decoding the once encoded data using a first key to produce news data which includes either or both of text data or graphic data; and

storing the news data in a storage medium.

15. A news data broadcast system comprising:

a transmitter for encoding and transmitting news data via a broadcast satellite and including;

a storage medium for storing news data,

a first encoder for encoding the news data using primary key data to produce primary encoded news data,

a second encoder for encoding the primary encoded news data using secondary key data to produce secondary encoded news data; and

a receiver for receiving the secondary encoded news data via the broadcast satellite and including;

a first decoder for decoding the secondary encoded news data using the secondary key data to produce the primary decoded news data,

a second decoder for decoding the primary decoded news data using the primary key data to produce the news data; and

a storage medium for storing the news data.

16. A transmitter for transmitting news data via satellite comprising:

an information scramble processing unit for scrambling the news data once using a predetermined first key to produce and output first scrambled news data;

a data scrambler for scrambling the once scrambled news data again using a predetermined second key to produce and output twice scrambled news data; and

transmitting circuitry for broadcasting the twice scrambled news data via a transmitter antenna.

17. A receiver for receiving news data broadcast via satellite comprising:

circuitry for receiving twice scrambled news data broadcast via satellite;

a data descrambler for decoding the twice scrambled news data using a predetermined first key and outputting first descrambled data;

a storage medium for storing the first descrambled news data;

an information descramble processing unit for reading the first descrambled news data from the storage medium and descrambling the first descrambled news data using a second key to produce a fully descrambled news data signal; and

a user terminal for viewing the fully descrambled news data.