Information recording processing apparatus, information reproduction processiing apparatus, information recording medium, information recording processing method, information reproduction processing method, and computer program

• US 20050089162A1
• Filed: 10/22/2004
• Published: 04/28/2005
• Est. Priority Date: 10/22/2003
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kobayashi, Shoei
• Granted Patent: US 7,796,754 B2
• Time in Patent Office: Days
• US Class Current: 380/44
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00282 the key being stored in the content area, e.g. program area, data area or user area key stored in a management area G11B20/00297
• CPC Class Codes: G11B 20/00376 the key being stored by varying the pit format, e.g. depth, width, length or edge positions
• CPC Class Codes: G11B 20/00405 the key being stored by varying characteristics of the recording track, e.g. by altering the track pitch or by modulating the wobble track
• CPC Class Codes: G11B 20/00652 the address data being scrambled so that ascending address values do not reflect the physical order of data blocks
• CPC Class Codes: G11B 20/18 Error detection or correction; Testing , e.g. of drop-outs

Abstract

An information recording and/or reproduction processing apparatus is provided. The information recording and/or reproduction processing apparatus is provided by which additional information such as copy protection information is recorded as encrypted data on an information recording medium and also a cryptographic key is recorded such that the difficulty in analysis thereof is promoted. Where additional information such as copy protection information is encrypted and recorded and also a cryptographic key for the encrypted additional information is recorded together, a seed is generated based on an error correction code set corresponding to the additional information. Then, a scrambling or bit position conversion process in which random numbers generated based on the seed are applied is executed for the cryptographic key data, and resulting cryptographic key data is recorded on an information recording medium. Upon such recording, the additional information is recorded as pit information while the cryptographic key data is recorded as wobble data. The cryptographic key has an increased difficulty in analysis and allows achievement of an efficient data reproduction process.

Claims

1. An information recording processing apparatus for executing a data recording process, comprising:

a seed generation section for generating a seed based on an error detection code set corresponding to recording object data;

a random number generation section for generating random numbers based on the seed generated by the seed generation section;

a scramble processing section for executing a scrambling process, in which the random numbers generated by the random number generation section are applied, for cryptographic key data set as a cryptographic key for the recording object data; and

a recording processing section for executing a recording process of a cryptographic key data recording signal generated based on scrambled data obtained by the scrambling process.

2. The information recording processing apparatus according to claim 1, further comprising a bit position conversion section for executing a bit position conversion process, in which the random numbers generated by the random number generation section are applied, for the cryptographic key data set as the cryptographic key for the recording object data, the recording processing section executing a recording process of a cryptographic key data recording signal generated based on data obtained by the bit position conversion process.

3. The information recording processing apparatus according to claim 1, wherein the recording processing section records the cryptographic key data recording signal as a physical recording signal different from a pit signal.

4. The information recording processing apparatus according to claim 1, wherein the recording processing section encrypts the recording object data with the cryptographic key and records the encrypted recording object data as a pit signal, and records the cryptographic key data recording signal corresponding to the cryptographic key as a physical recording signal different from the pit signal at a position at which the pit signal is recorded.

5. The information recording processing apparatus according to claim 2, wherein the seed generation section executes, based on the error detection code set corresponding to the recording object data, generation of a plurality of seeds including a first seed for generation of random numbers to be applied in the scrambling process of the scramble processing section and a second seed for generation of random numbers to be applied in the bit position conversion process of the bit position conversion section.

6. An information recording processing apparatus for executing a data recording process, comprising:

a seed generation section for generating a seed based on an error detection code set corresponding to recording object data;

a random number generation section for generating random numbers based on the seed generated by the seed generation section;

a bit position conversion section for executing a bit position conversion process, in which random numbers generated by the random number generation section are applied, for cryptographic key data set as a cryptographic key for the recording object data, and

a recording processing section for executing a recording process of a cryptographic key data recording signal generated based on the data obtained by the bit position conversion process.

7. An information reproduction processing apparatus for executing a reproduction process of data recorded as encrypted data on an information recording medium, comprising:

a seed generation section for generating a seed based on an error detection code set corresponding to reproduction object data;

a random number generation section for generating random numbers based on the seed generated by the seed generation section;

a descramble processing section for executing a descrambling process, in which the random numbers generated by the random number generation section are applied, for cryptographic key data set as a cryptographic key for the reproduction object data and read from the information recording medium; and

a decryption processing section for executing a decryption process of the reproduction object data with a cryptographic key generated based on the descrambled cryptographic key data.

8. The information reproduction processing apparatus according to claim 7, further comprising a bit position conversion section for executing a bit position conversion process, in which random numbers generated by the random number generation section are applied, for the cryptographic key data read from the information recording medium, the decryption processing section executing the decryption process of the reproduction object data with a cryptographic key generated based on data obtained by the bit position conversion process by the bit position conversion section.

9. The information reproduction processing apparatus according to claim 7, further comprising a reading section for reading the cryptographic key data from a physical recording signal recorded on the information recording medium but different from a pit signal.

10. The information reproduction processing apparatus according to claim 7, further comprising a reading section for reading the reproduction object data from a pit signal recorded on the information recording medium and reading the cryptographic key data from a physical recording signal different from a pit signal at a position at which the pit signal is recorded.

11. The information reproduction processing apparatus according to claim 8, wherein the seed generation section executes, based on the error detection code set corresponding to the reproduction object data, generation of a plurality of seeds including a first seed for generation of random numbers to be applied in the descrambling process of the descramble processing section and a second seed for generation of random numbers to be applied in the bit position conversion process of the bit position conversion section.

12. An information reproduction processing apparatus for executing a reproduction process of data recorded as encrypted data on an information recording medium, comprising:

a seed generation section for generating a seed based on an error detection code set corresponding to reproduction object data;

a random number generation section for generating random numbers based on the seed generated by the seed generation section;

a bit position conversion section for executing a bit position conversion process, in which random numbers generated by the random number generation section are applied, for cryptographic key data set as a cryptographic key for the reproduction object data and read from the information recording medium; and

a decryption processing section for executing a decryption process of the reproduction object data with a cryptographic key generated based on the data obtained by the bit position conversion process.

13. An information recording medium comprising parts on which encrypted data and cryptographic key data generated based on a cryptographic key applied in an encryption process of the encrypted data are recorded, the cryptographic key data being recorded as data obtained by a scrambling process in which random numbers generated using a seed generated based on an error detection code corresponding to the encrypted data as an input are applied.

14. The information recording medium according to claim 13, wherein the cryptographic key data is recorded as data obtained by a bit position conversion process in which random numbers generated using another seed generated based on the error detection code corresponding to the encrypted data as an input are applied.

15. The information recording medium according to claim 13, wherein the cryptographic key data is recorded as a physical recording signal different from a pit signal.

16. The information recording medium according to claim 13, wherein the encrypted data is additional information set corresponding to contents and including copy protection information, the additional information being recorded as a pit signal encrypted with the cryptographic key, the cryptographic key data being recorded as a physical recording signal different from the pit signal at a position at which the pit signal is recorded.

17. The information recording medium according to claim 16, wherein the pit signal based on the additional signal and the physical recording signal based on the cryptographic key data and different from the pit signal are recorded in a lead-in region.

18. An information recording processing method for executing a data recording process, comprising:

a seed generation step of generating a seed based on an error detection code set corresponding to recording object data;

a random number generation step of generating random numbers based on the seed generated by the seed generation step;

a scramble processing step of executing a scrambling process, in which the random numbers generated by the random number generation step are applied, for cryptographic key data set as a cryptographic key for the recording object data; and

a recording processing step of executing a recording process of a cryptographic key data recording signal generated based on scrambled data obtained by the scramble processing step.

19. The information recording processing method according to claim 18, further comprising a bit position conversion step of executing a bit position conversion process, in which the random numbers generated by the random number generation step are applied, for the cryptographic key data set as the cryptographic key for the recording object data, the recording processing step executing a recording process of a cryptographic key data recording signal generated based on data obtained by the bit position conversion process.

20. The information recording processing method according to claim 18, wherein the recording processing step records the cryptographic key data recording signal as a physical recording signal different from a pit signal.

21. The information recording processing method according to claim 18, wherein the recording processing step encrypts the recording object data with the cryptographic key and records the encrypted recording object data as a pit signal, and records the cryptographic key data recording signal corresponding to a cryptographic key as a physical recording signal different from the pit signal at the position at which the pit signal is recorded.

22. The information recording processing method according to claim 19, wherein the seed generation step executes, based on the error detection code set corresponding to the recording object data, generation of a plurality of seeds including a first seed for generation of random numbers to be applied in the scrambling process of the scramble processing step and a second seed for generation of random numbers to be applied in the bit position conversion process of the bit position conversion step.

23. An information recording processing method for executing a data recording process, comprising:

a seed generation step of generating a seed based on an error detection code set corresponding to recording object data;

a random number generation step of generating random numbers based on the seed generated by the seed generation step;

a bit position conversion step of executing a bit position conversion process, in which random numbers generated by the random number generation step are applied, for cryptographic key data set as a cryptographic key for the recording object data; and

a recording processing step of executing a recording process of a cryptographic key data recording signal generated based on data obtained by the bit position conversion process.

24. An information reproduction processing method for executing a reproduction process of data recorded as encrypted data on an information recording medium, comprising:

a seed generation step of generating a seed based on an error detection code set corresponding to reproduction object data;

a random number generation step of generating random numbers based on the seed generated by the seed generation step;

a descramble processing step of executing a descrambling process, in which the random numbers generated by the random number generation step are applied, for cryptographic key data set as a cryptographic key for the reproduction object data and read from the information recording medium; and

a decryption processing step of executing a decryption process of the reproduction object data with a cryptographic key generated based on the descrambled cryptographic key data.

25. The information reproduction processing method according to claim 24, further comprising a bit position conversion step of executing a bit position conversion process, in which random numbers generated by the random number generation step are applied, for the cryptographic key data read from the information recording medium, the decryption processing step executing the decryption process of the reproduction object data with a cryptographic key generated based on data obtained by the bit position conversion process by the bit position conversion step.

26. The information reproduction processing method according to claim 24, further comprising a reading step of reading the cryptographic key data from a physical recording signal recorded on the information recording medium but different from a pit signal.

27. The information reproduction processing method according to claim 24, further comprising a reading step of reading the reproduction object data from a pit signal recorded on the information recording medium and reading the cryptographic key data from a physical recording signal different from a pit signal at a position at which the pit signal is recorded.

28. The information reproduction processing method according to claim 25, wherein the seed generation step executes, based on the error detection code set corresponding to the reproduction object data, generation of a plurality of seeds including a first seed for generation of random numbers to be applied in the scrambling process of the scramble processing step and a second seed for generation of random numbers to be applied in the bit position conversion process of the bit position conversion step.

29. An information reproduction processing method for executing a reproduction process of data recorded as encrypted data on an information recording medium, comprising:

a seed generation step of generating a seed based on an error detection code set corresponding to reproduction object data;

a random number generation step of generating random numbers based on the seed generated by the seed generation step;

a bit position conversion processing step of executing a bit position conversion process, in which random numbers generated by the random number generation step are applied, for cryptographic key data set as a cryptographic key for the reproduction object data and read from the information recording medium; and

a decryption processing step of executing a decryption process of the reproduction object data with a cryptographic key generated based on data obtained by the bit position conversion process.

30. A computer program for executing a data recording process, comprising:

a seed generation step of generating a seed based on an error detection code set corresponding to recording object data;

a random number generation step of generating random numbers based on the seed generated by the seed generation step;

a scramble processing step of executing a scrambling process, in which the random numbers generated by the random number generation step are applied, for cryptographic key data set as a cryptographic key for the recording object data; and

a recording processing step of executing a recording process of a cryptographic key data recording signal generated based on the scrambled data.

31. A computer program for executing a reproduction process of data recorded as encrypted data on an information recording medium, comprising:

a seed generation step of generating a seed based on an error detection code set corresponding to reproduction object data;

a random number generation step of generating random numbers based on the seed generated by the seed generation step;

a descramble processing step of executing a descrambling process, in which the random numbers generated by the random number generation step are applied, for cryptographic key data set as a cryptographic key for the reproduction object data and read from the information recording medium; and

a decryption processing step of executing a decryption process of the reproduction object data with a cryptographic key generated based on the descrambled cryptographic key data.