CN102194497A - Optical disk ant-transcription method applying hardware - Google Patents
Optical disk ant-transcription method applying hardware Download PDFInfo
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- CN102194497A CN102194497A CN2010101211340A CN201010121134A CN102194497A CN 102194497 A CN102194497 A CN 102194497A CN 2010101211340 A CN2010101211340 A CN 2010101211340A CN 201010121134 A CN201010121134 A CN 201010121134A CN 102194497 A CN102194497 A CN 102194497A
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Abstract
The invention relates to an optical disk ant-transcription method applying hardware. A public media key formed by a system time stamp is used for generating an encrypted media ciphertext; the source code of an application program is set, and an execution machine code is generated by a scrambler program; then, a scrambler sequence generated by the public device key scrambles the execution machine code into an executable program code; the encrypted media ciphertext, the executable program code and the system time stamp are arranged in the optical disk, and the public device key is stored in the hardware device; the optical disk is arranged in the computer to read and simultaneously connect the hardware device; the computer transfers the executable program code of the optical disk and the system time stamp to the hardware device; the hardware device carries out anti-scrambling on the executable program code to obtain the execution machine code; the execution machine code starts a media playing program; and meanwhile, the encrypted media ciphertext is encrypted and played. In the optical disk ant-transcription method, the safety of the media storage programme in the optical disk is intensified by the scrambling technology so as to prevent the optical disk from being transcribed by illegal personnel.
Description
Technical field
The present invention is the anti-dubbing method of a kind of CD of using external hardware unit decrypting disc internal processes, is meant that especially a kind of scrambler technology of using strengthens the security of disk inner medium stored routine and prevent that CD from suffering the method that illegal personage transcribes.
Background technology
Because computer product is flourish in recent years, have the big and cheap multifunctional optical disk Digital Media of storage volume, become the normal Storage Media that uses of general masses, also just because of storage volume is big and cheap, have general computing machine relevant knowledge person and often the data content of optical disc digital medium internal memory can be copied storage, the data content that cracks is duplicated again and peddle, therefore, causing on the market, the problem of pirated CDs is on the rise.
In medium pirate technology and software very handy today, in order to protect medium supplier's right, except general Wise property protected by law, the duplication technology that prevents of media data had become the indispensable ring of protection medium supplier.
Released the anti-pirate technology of AACS in 2007 with new power, exactly for provide a cover practical prevent duplication technology, yet the anti-pirate technology of this AACS is come out in the near future, just has the people that it is cracked, it serves to show has proved the challenge that prevents duplication technology.
AACS is a kind of anti-pirate technology that is used in the Blu-ray Disc, the golden key (EncryptedTitle Key) of title and the medium ciphertext (Encrypted Content) of include medium gold key block (Media Key Block), film gold key (Volume Key) in a Blu-ray Disc with AACS technology, encrypting; And all are used to play in the playout software of Blu-ray Disc and the hardware playing device and then include the device gold key (Device Key) and the sequence gold key (SequencyKey) of being authorized by AACS.
In use CD can be first comparison device gold key whether legal, golden key is legal, then will to begin a series of decrypted program in not being put on the blacklist as follows if install:
1. in medium gold key block, read medium gold key and decrypt program gold key with the collocation of sequence gold key.
2. the film gold key that must read and can't be replicated with specific process with said procedure gold key collocation one decrypts unique film gold key (Volume Unique Key) with the decrypt operation method of AES-G.
3. the title gold key that reading encrypted is crossed in CD and unique film gold key of arranging in pairs or groups decrypt title gold key (Title Key).
4. re-using title gold key at last is spendable medium archives with the medium decrypt ciphertext.
Main strick precaution mechanism is exactly to utilize a special film gold key (Volume Key) to prevent that the medium archives from being duplicated by the people in this kind method, and aforesaid film gold key is to record on CD with special device, and can't read or duplicate in general burning mode.
Yet still cracked on the market now, its reason is that the hacker directly removes to seek temporary film gold key (Volume Key) in the internal memory by computing machine, once after film gold key obtained, the hacker just can duplicate and propagate all the elements on the CD easily.
And as frightening the means that the resistance hacker cracks, AACS LA can be applied to detecting crack the device gold key (Device Key) on optical disc apparatus or the software fully, and with in it adding blacklist, after this, so long as have the playout software or the player of same apparatus gold key all again can't read the Blu-ray Disc data of being issued after that, this measure certainly will need to collect user's personal data, causes the dispute on user's human rights easily.
Therefore, in the anti-strike-machine system of present various media datas, still lack a kind of easyly and need not collect the anti-copy method of user's data, therefore, the anti-dubbing method of CD of using computer hardware obviously has the improved necessity of continuation.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of anti-dubbing method of CD of using computer hardware, need to cooperate the hardware unit of circumscribed to come the medium stored routine of decrypting disc internal application scrambler technology reinforcement, promote the deciphering complicacy and the anti-rotation security of whole CD internal media data, use preventing that CD from suffering that illegal personage transcribes.
Secondary objective of the present invention is that the medium gold key in the CD is to produce at random, every CD all contains different medium gold keys, in addition, add scrambler technology anti-rotation at the disk inner media data, can allow illegal personage when cracking different discs, equally all need to spend the plenty of time, use and reduce the possibility that CD is transcribed.
For reaching described purpose, the invention provides a kind of anti-dubbing method of CD of using computer hardware, comprise following steps:
(A) use hash function (Hash function) and produce medium gold key, and the media data of desire protection is used above-mentioned medium gold key carry out cryptographic algorithm and produce an encrypted media ciphertext in the stochastic system time stamp.Above-mentioned hash function is a kind of Advanced Encryption Standard, and above-mentioned Advanced Encryption Standard comprises: the authentication code of single password block chaining, coding feedback, electronics sign indicating number block and output feedback.
(B) utilize customized source code generator to produce the application program source code, and carry out the scrambler program at the application program source code and produce the scrambler source code, again the compiling of scrambler source code is become the execution machine code.Above-mentioned application program source code comprises: the access program of medium gold key is put in the decoding engine of data transmission module, cryptographic algorithm, media play procedure, medium gold key and access.
(C) according to a default device gold key, the system time stamp is produced a scrambler sequence with hash function, again the execution machine code is used above-mentioned scrambler sequence and produce an executable program code.Above-mentioned hash function is a kind of Advanced Encryption Standard, and above-mentioned Advanced Encryption Standard comprises: the authentication code of single password block chaining, coding feedback, electronics sign indicating number block and output feedback.
(D) with encrypted media ciphertext, executable program code and the burning of system time stamp in a CD, in addition will install golden key safe storage in a hardware unit.
(E) CD is connected use with hardware unit with computing machine, computing machine can transfer to hardware unit with the routine data of disk inner, and its anti-scrambler is become one carries out machine code and be back to computing machine.The detailed step of above-mentioned steps (E) is as follows:
1. CD is positioned in the computing machine, and hardware unit is connected in computing machine simultaneously;
2. computing machine can transfer to hardware unit inside with executable program code in the CD and system time stamp;
3. hardware unit can calculate the respective function of scrambler sequence according to golden key of device and system time stamp;
4. executable program code is carried out anti-scrambler program with respective function and produce the execution machine code; And
5. be back in the computing machine carrying out machine code again.
(F) carry out the deciphering broadcast that above-mentioned execution machine code is carried out disk inner encrypted media ciphertext by computing machine.The detailed step of above-mentioned steps (F) is as follows:
1. carry out above-mentioned execution machine code by computing machine and start the media play procedure of itself;
2. use the access program of carrying out machine code and obtain medium gold key;
3. cooperate medium gold key to be decrypted the generation media data with the decoding engine at the encrypted media ciphertext; And
4. the media data that reduces is transferred to media play procedure and reads broadcast.
In a preferred embodiment, above-mentioned hardware unit comprises: a secure memory module, in order to storage device gold key; An and hash module, be connected in above-mentioned secure memory module, be used for receiving executable program code and system time stamp that device gold key that the secure memory module deposits and disk inner transmit, and see through device gold key and the system time stamp becomes an execution machine code with the anti-scrambler of executive routine code.
Above-mentioned secure memory module has a restriction accessibility and an anti-channeling modification, only can carry out the access of device gold key by above-mentioned hash module, and when the assailant plans positive opening hardware unit and reading data in EMS memory, can erase the automatically device gold key of internal reservoir of above-mentioned secure memory module.
Above-mentioned medium gold key is to leave in the part block of above-mentioned application program source code with a kind of dispersing mode; And executable program code is an invalid program code, must cooperate the anti-scrambler program of hardware unit, could produce one and have the execution machine code of carrying out effect.
Effect of the present invention is the medium stored routine that the digital content in the discs need cooperate the hardware unit of circumscribed to come decrypting disc internal application scrambler technology to strengthen, promote the deciphering complicacy and the anti-rotation security of whole CD internal media data, in addition, medium gold key in the CD is to produce at random, every CD all contains different medium gold keys, in addition, add scrambler technology anti-rotation at the disk inner media data, can allow illegal personage when cracking different discs, equally all need to spend the plenty of time, use and reduce the possibility that CD is transcribed.
Description of drawings
Fig. 1 is the synoptic diagram of a preferred embodiment of the present invention;
Fig. 2 is a structural drawing of the present invention;
Fig. 3 is the block diagram that the present invention uses the anti-dubbing method of CD of computer hardware;
Fig. 4 is the structural representation of step of the present invention (B) application program source code;
Fig. 5 is the detailed step figure of step of the present invention (E);
Fig. 6 is the detailed step figure of step of the present invention (F); And;
Fig. 7 is the synoptic diagram of hardware unit inner structure of the present invention.
[primary clustering symbol description]
10------CD 172------deciphers engine
11------medium gold key 173------media play procedure
12------encrypted media ciphertext 174------access program
13------system time stamp 20------hardware unit
14------carries out machine code 21------device gold key
15------executable program code 22------secure memory module
16------media data 23------hash module
17------application program source code 30------computing machine
The 171------data transmission module
Embodiment
For ease of further structure of the present invention, use and feature thereof being had clear and definite full and accurate understanding of darker one deck and understanding, now enumerate preferred embodiment, conjunction with figs. is described in detail as follows:
At first, see also Figure 1 and Figure 2, the present invention is a kind of at Digital Media, comprise archives, CD DVD Audio and CD the anti-technology of copying of CD of DVD Video, principal feature of the present invention is that anti-rerecording device uses a computer hardware and cooperate that CD is anti-transcribes, and the present invention mainly comprises CD 10 and encrypts scramblers and hardware unit 20 anti-scramblers two parts.
Digital content in the CD 10 comprises encrypted media ciphertext 12, a system time stamp 13 and that is produced by the golden key 21 of device that is produced by medium gold key 11 and cooperates the executable program code 15 that scrambler sequence produced by carrying out machine code 14; Hardware unit 20 then is to cooperate the executable program code 15 of CD 10 internal reservoir and system time stamp 13 to carry out anti-scrambler program by the device gold key 21 that inside is provided with.
Owing to carry out machine code 14 is to come scrambler to produce executable program code 15 via the golden key 21 of device, so executable program code 15 is if carry out separately, be not have any effect, the device gold key 21 that executable program code 15 must be cooperated hardware unit 20, executable program code 15 anti-scramblers can be become originally had the execution machine code 14 of carrying out effect, allow computing machine 30 be used and carry out the encrypted media ciphertext 12 that machine code 14 is decrypted CD 10, it is therefore, of the present invention that anti-to copy the technology emphasis be checking and the anti-scrambler that carries out CD 10 storage datas at application hardware device 20.
See also shown in Figure 3ly, the anti-dubbing method of CD that the present invention uses computer hardware comprises following steps:
(A) use hash function (Hash function) and produce medium gold key 11 (Km=AES-OMAC (T)), and the golden key 11 of the above-mentioned medium of media data 16 usefulness of desire protection is carried out cryptographic algorithm (AES-CBC Encryption) produce an encrypted media ciphertext 12 (Ciphertext) in stochastic system time stamp T (Randomly Generate Current time-stamp);
(B) utilize customized source code generator (Customized Soure Program Generator) to produce application program source code 17 (Src (P)), and carry out scrambler program (Code Obfuscation) at application program source code 17 (Src (P)) and produce scrambler source code Src (P) ', scrambler source code Src (P) ' compiling (Compling) is become carry out machine code 14 again;
(C) according to a default device gold key 21 (Ksd), system time stamp 13 is produced a scrambler sequence with hash function ((Hash function)), and (X=Gen (AES-OMAC (T) ‖ Y) comes machine code scrambler (Binary Code Obfuscation) to produce an executable program code 15 carrying out the above-mentioned scrambler sequence of machine code 14 application again;
(D) with encrypted media ciphertext 12, executable program code 15 and 13 burnings of system time stamp in a CD 10, in addition will install golden key 21 safe storage in a hardware unit 20;
(E) CD 10 is connected use with hardware unit 20 with computing machine 30, computing machine 30 can transfer to hardware unit 20 with the routine data of CD 10 inside, and its anti-scrambler is become one carries out machine code 14 and be back to computing machine 30; And
(F) carry out above-mentioned execution machine code 14 by computing machine 30 and carry out the deciphering broadcast that CD 10 stores the inner encrypted media ciphertext 12 of body.
The hash function of above-mentioned steps (A) and step (C) is a kind of Advanced Encryption Standard (Advanced Encryption Standard, AES), (Advanced Encryption Standard AES) is a kind of block encryption standard that Federal Government adopts to so-called Advanced Encryption Standard.This standard be used for substituting original data encryption standards (Data Encryption Standard,
DES), analyzed in many ways and widely the whole world use, Advanced Encryption Standard becomes one of most popular algorithm in the symmetric key encryption already.
Above-mentioned Advanced Encryption Standard comprises: the authentication code of single password block chaining (Advanced Encryption Standard-OneKey Cipher Block Chaining Message Authentication Code, AES-OMAC), coding feedback (AdvancedEncryption Standard-Cipher-Block Chaining, AES-CBC), electronics sign indicating number block (Advanced EncryptionStandard-Cipher Feedback, AES-CFB) and output feedback ((Advanced Encryption Standard-OutputFeedback, AES-OFB).
See also shown in Figure 4ly, the application program source code 17 of above-mentioned steps (B) comprises: the access program 174 of medium gold key 11 is put in the decoding engine 172 of data transmission module 171, cryptographic algorithm, media play procedure 173, medium gold key 11 and access; And above-mentioned medium gold key 11 is to leave in the part block of above-mentioned application program source code 17 with a kind of dispersing mode, must can read out above-mentioned medium gold key 11 by above-mentioned access program 174.
The executable program code 15 that above-mentioned steps (C) is produced is an invalid program code, must cooperate the anti-scrambler program of hardware unit 20, could produce one and have the execution machine code 14 of carrying out effect; And above-mentioned machine code scrambler comprises: insert irrelevant integral operation instruction (Insert dummy instructions), carry out confusion (Permutation) with sortord.
See also shown in Figure 5ly, the detailed step of above-mentioned steps (E) comprises:
1. CD 10 is stored body and be positioned in the computing machine 30, and hardware unit 20 is connected in computing machine 30 simultaneously;
2. computing machine 30 can transfer to hardware unit 20 inside with executable program code in the CD 10 15 and system time stamp 13;
3. hardware unit 20 can be according to golden key 21 of device and system time stamp 13, calculates the respective function (X=GEN (AES-OMAC (T) ' ‖ E (T) ') of scrambler sequence;
4. executable program code 15 is carried out anti-scrambler program (Binary Code De-Obfuscation) with respective function and produce execution machine code 14; And
5. be back in the computing machine 30 carrying out machine code 14 again.
See also shown in Figure 6ly, the detailed step of above-mentioned steps (F) comprises:
1. carry out above-mentioned execution machine code 14 by computing machine 30 and start the media play procedure 173 of itself;
2. use the access program of carrying out machine code 14 and obtain medium gold key 11;
3. cooperate medium gold key 11 to be decrypted with the decoding engine and produce media data 16 at encrypted media ciphertext 12; And
4. the media data 16 that reduces is transferred to media play procedure 173 and reads broadcast.
See also shown in Figure 7ly, hardware unit 20 of the present invention is an anti-tamper device (Tamper Resistant Device), and above-mentioned hardware unit 20 only can carry out the anti-scrambler of computing, can't carry out layout decoding (Layout Decoding) to its circuit.
In diagram one preferred embodiment, above-mentioned hardware unit 20 comprises: a secure memory module 22 in order to storage device gold key 21; An and hash module 23 that is connected in above-mentioned secure memory module 22, above-mentioned hash module 23 is used for receiving the executable program code 15 and system time stamp 13 that device gold key 21 that secure memory module 22 deposits and CD 10 inside are transmitted, and sees through device gold key 21 and system time stamp 13 and executable program code 15 anti-scramblers are become one carry out machine code 14.
In a preferred embodiment, above-mentioned secure memory module 22 has a restriction accessibility (Access Control) and an anti-channeling modification (Tamper-Resistance), and above-mentioned restriction accessibility mainly is to allow device gold key 21 only can carry out access by above-mentioned hash module 23; And above-mentioned anti-channeling modification is when the assailant plans positive opening hardware unit 20 and reading data in EMS memory, can erase the automatically device gold key 21 of internal reservoir of above-mentioned secure memory module 22.
In sum, the present invention uses the anti-dubbing method of CD of computer hardware encrypted media ciphertext, executable program code and system time stamp is located in the CD, to install golden key is stored in hardware unit in addition, when reading, computing machine storing CD needs connection hardware device simultaneously, computing machine can reach hardware unit to the executable program code of CD and system time stamp, by hardware unit the anti-scrambler of executable program code is become to carry out machine code, allow and carry out machine code startup media play procedure and simultaneously the encrypted media ciphertext is deciphered broadcast.
The medium stored routine that digital content in the discs of the present invention need cooperate the hardware unit of circumscribed to come decrypting disc internal application scrambler technology to strengthen, promote the deciphering complicacy and the anti-rotation security of whole CD internal media data, in addition, medium gold key in the CD is to produce at random, every CD all contains different medium gold keys, in addition, add scrambler technology anti-rotation at the disk inner media data, can allow illegal personage when cracking different discs, equally all need to spend the plenty of time, use and reduce the possibility that CD is transcribed.
Above illustrated embodiment only is not in a limitative way with the present invention for convenience of description, not from the present invention's spirit category, be familiar with industry technician various simple and easy distortion and the modification that can do, all must include in the scope of patent protection of the present invention.
Claims (10)
1. a CD of using computer hardware is prevented dubbing method, and it is characterized in that: said method comprises following steps:
(A) use hash function and produce medium gold key, and the media data of desire protection is used above-mentioned medium gold key carry out cryptographic algorithm and produce an encrypted media ciphertext in the stochastic system time stamp;
(B) utilize customized source code generator to produce the application program source code, and carry out the scrambler program at the application program source code and produce the scrambler source code, again the compiling of scrambler source code is become the execution machine code;
(C) according to a default device gold key, the system time stamp is produced a scrambler sequence with hash function, again the execution machine code is used above-mentioned scrambler sequence and produce an executable program code;
(D) with encrypted media ciphertext, executable program code and the burning of system time stamp in a CD, in addition will install golden key safe storage in a hardware unit;
(E) CD is connected use with hardware unit with computing machine, computing machine can transfer to hardware unit with the routine data of disk inner, and its anti-scrambler is become one carries out machine code and be back to computing machine; And
(F) carry out the deciphering broadcast that above-mentioned execution machine code is carried out disk inner encrypted media ciphertext by computing machine.
2. according to the anti-dubbing method of the CD of the described application computer hardware of claim 1, it is characterized in that: the hash function of described step (A) and step (C) is a kind of Advanced Encryption Standard, and above-mentioned Advanced Encryption Standard comprises: the authentication code of single password block chaining, coding feedback, electronics sign indicating number block and output feedback.
3. according to the anti-dubbing method of the CD of the described application computer hardware of claim 1, it is characterized in that; The executable program code of described step (C) is an invalid program code, must cooperate the anti-scrambler program of hardware unit, could produce one and have the execution machine code of carrying out effect.
4. according to the anti-dubbing method of the CD of the described application computer hardware of claim 1, it is characterized in that: described step (E) comprises:
CD is positioned in the computing machine, and hardware unit is connected in computing machine simultaneously;
Computing machine can transfer to hardware unit inside with executable program code in the CD and system time stamp;
Hardware unit can calculate the respective function of scrambler sequence according to golden key of device and system time stamp;
Executable program code is carried out anti-scrambler program with respective function produce the execution machine code; And
Be back in the computing machine carrying out machine code again.
5. according to the anti-dubbing method of the CD of the described application computer hardware of claim 1, it is characterized in that: the application program source code of described step (B) comprises: the access program of medium gold key is put in the decoding engine of data transmission module, cryptographic algorithm, media play procedure, medium gold key and access.
6. according to the anti-dubbing method of the CD of the described application computer hardware of claim 5, it is characterized in that: described medium gold key is to leave in the part block of above-mentioned application program source code with a kind of dispersing mode.
7. according to the anti-dubbing method of the CD of the described application computer hardware of claim 5, it is characterized in that: described step (F) comprises:
Carry out above-mentioned execution machine code by computing machine and start the media play procedure of itself;
Use the access program of carrying out machine code and obtain medium gold key;
Cooperate medium gold key to be decrypted the generation media data with the decoding engine at the encrypted media ciphertext; And
The media data that reduces is transferred to media play procedure reads broadcast.
8. according to the anti-dubbing method of the CD of the described application computer hardware of claim 1, it is characterized in that: above-mentioned hardware unit comprises:
One secure memory module is in order to storage device gold key; And
One hash module, be connected in above-mentioned secure memory module, be used for receiving executable program code and system time stamp that device gold key that the secure memory module deposits and disk inner transmit, and see through device gold key and the system time stamp becomes an execution machine code with the anti-scrambler of executive routine code.
9. the CD of described according to Claim 8 application computer hardware is prevented dubbing method, it is characterized in that: described secure memory module has a restriction accessibility, only can carry out the access of device gold key by above-mentioned hash module.
10. the CD of described according to Claim 8 application computer hardware is prevented dubbing method, it is characterized in that: described secure memory module has an anti-channeling modification, when the assailant plans positive opening hardware unit and reading data in EMS memory, can erase the automatically device gold key of internal reservoir of above-mentioned secure memory module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010121134 CN102194497B (en) | 2010-03-10 | 2010-03-10 | Optical disk ant-transcription method applying hardware |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010121134 CN102194497B (en) | 2010-03-10 | 2010-03-10 | Optical disk ant-transcription method applying hardware |
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| CN102194497A true CN102194497A (en) | 2011-09-21 |
| CN102194497B CN102194497B (en) | 2013-09-18 |
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| CN 201010121134 Expired - Fee Related CN102194497B (en) | 2010-03-10 | 2010-03-10 | Optical disk ant-transcription method applying hardware |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103295605A (en) * | 2013-05-31 | 2013-09-11 | 广东宏景科技有限公司 | Light disk file system supportive of data privacy |
| CN103514921A (en) * | 2012-06-27 | 2014-01-15 | 方可成 | Transcription prevention technology of optical storage device |
| TWI774902B (en) * | 2018-12-28 | 2022-08-21 | 新唐科技股份有限公司 | Private key protection method and private key protection system |
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| CN1489082A (en) * | 2002-10-10 | 2004-04-14 | 财团法人工业技术研究院 | Disk anti-copying system, method and apparatus |
| US20070107063A1 (en) * | 2005-11-09 | 2007-05-10 | Andreas Eckleder | Method and means for writing decryption information to a storage medium, storage medium, method and means for reading data from a storage medium, and computer program |
| US20090323966A1 (en) * | 2008-06-30 | 2009-12-31 | Condel International Technologies Inc. | Method and system for enhancing data encryption using multiple-key lists |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1489082A (en) * | 2002-10-10 | 2004-04-14 | 财团法人工业技术研究院 | Disk anti-copying system, method and apparatus |
| US20070107063A1 (en) * | 2005-11-09 | 2007-05-10 | Andreas Eckleder | Method and means for writing decryption information to a storage medium, storage medium, method and means for reading data from a storage medium, and computer program |
| US20090323966A1 (en) * | 2008-06-30 | 2009-12-31 | Condel International Technologies Inc. | Method and system for enhancing data encryption using multiple-key lists |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103514921A (en) * | 2012-06-27 | 2014-01-15 | 方可成 | Transcription prevention technology of optical storage device |
| CN103514921B (en) * | 2012-06-27 | 2016-05-04 | 方可成 | The anti-transcription technique of optical disc drive |
| CN103295605A (en) * | 2013-05-31 | 2013-09-11 | 广东宏景科技有限公司 | Light disk file system supportive of data privacy |
| CN103295605B (en) * | 2013-05-31 | 2016-01-20 | 广东宏景科技有限公司 | The compact disk file system that a kind of supported data is maintained secrecy |
| TWI774902B (en) * | 2018-12-28 | 2022-08-21 | 新唐科技股份有限公司 | Private key protection method and private key protection system |
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| CN102194497B (en) | 2013-09-18 |
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