CN1822171A - Data scrambling and decoding method for optic disc storage - Google Patents
Data scrambling and decoding method for optic disc storage Download PDFInfo
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- CN1822171A CN1822171A CNA200610018258XA CN200610018258A CN1822171A CN 1822171 A CN1822171 A CN 1822171A CN A200610018258X A CNA200610018258X A CN A200610018258XA CN 200610018258 A CN200610018258 A CN 200610018258A CN 1822171 A CN1822171 A CN 1822171A
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Abstract
This invention relates to a data harass and read method used in disk storage to apply harass to original code of user data, in which, the original code necessary for de-harass is taken as the ciphered code of a disk-analog code after being ciphered by multiple times, the harass data and the analog code are recorded on the disk in a way of separation or mixture and synchronous or asynchronous time sequence is applied in decoding, special IC sequence management is applied to coordinate content providers and the relation between the mother disk manufacturers and those of chips, said special IC is responsible for converting the ciphered codes to analog codes and every IC has a special sequence number forced to appear on the mother and disks.
Description
Technical field
The invention belongs to the CD storage technique field, be specifically related to CD encryption method, can in fields such as consumption optical storage and IT optical storage, use.
Technical background
At present; the main copyright protection technology CSS of DVD is cracked; CD circle has been released new copyright protection technology AACS; the password word length of AACS is increased to 128; stipulated the standard that audio and video files are shared simultaneously on PC; Belu ray has announced that also BD+ and ROM Mark technology add the strong copyright protection ability in addition; the core of BD+ is after the video disc player password is cracked; new password more; ROM Mark does physical markings on disc; have only authorized user could visit this mark, increase the difficulty of batch duplicating piracy with this.The core of CSS, AACS, BD+ all is the password of safeguarding on the video disc player, come the audio-visual data of encrypting is decrypted with it, this method is the mechanism that a kind of ratio is easier to realize, but, be cracked in case its problem is a password, total system will all lose efficacy, and, consider compatibility issue, remedy all bad doing; The CSS of DVD for example, it is cracked, and can't remedy.AACS---ultimate principle and CSS are similar, in case password is cracked, whole cryptographic system will all lose efficacy, and also can't remedy.Although BD+ is new password more, consider user's the extensive diversity and the replacement problem of video disc player, the operability of BD+ is still waiting to weigh.ROM Mark goes to consider a problem from another angle, and he requires the confidence level of technological system and manufacturing system fine, cooperates with one another.In fact, the cdrom encryption technology is a very complicated system, relates to disc manufacturer, the machine builder, and user's use habit (machine customer and pc user) and preservation and exchanged form, simple a kind of technology are difficult to realize effective copyright protection.
Summary of the invention
The object of the present invention is to provide a kind of data scrambling, deciphering method that is used for optical disc storage; overcome the deficiency of present CD copyright protection technology; the piece matching disc that employing is handled based on mixed signal carries cryptographic technique; by a kind of mutual confidence-building mechanism that reasonably can monitor between this technique construction chip manufacturer, stamper manufacturer and the content supplier; realize a kind of can acceptance, can protect the copyright protecting system of CD copyright again well by the consumer.
Technical scheme of the present invention is: a kind of data scrambling, deciphering method that is used for optical disc storage is characterized in that:
User data is adopted the original password scrambling;
The original password that the user data descrambling needs through behind the multi-enciphering as the cdrom encryption password;
The cdrom encryption password---the simulation password is one group of simulating signal, and this simulating signal can be followed the data-track on the CD, adopts axially or light signal feature radially writes down and reads, and also can occur with the form of an independent simulating signal code layer; Original password becomes the approach of simulation password through multi-enciphering: original password → (digital encryption) numerical ciphers → (conversion is encrypted) simulation password;
User data after the scrambling is recorded on the CD in the mode of separating or mixing with the simulation password, also adopts synchronous or asynchronous sequential to carry out during deciphering;
Adopt the application-specific integrated circuit sequence number to manage coordinating content provider, relation between stamper manufacturer and the chip manufacturer, this application-specific integrated circuit is responsible for converting the numerical ciphers after encrypting to the simulation password, and each IC has a special sequence number, and this sequence number is forced to appear on stamper and the CD.
Aforesaid data scrambling, the deciphering method that is used for optical disc storage is characterized in that concrete implementation step is as follows:
1. determine to meet the original password of certain rule by content supplier, this original password should be one group of 0,1 character string, according to the requirement difference of user to secret grade, can adopt the original password of different length, total principle is that the last simulation password that generates will cover whole CD.This flexible mechanism can adapt to different requirements on the one hand, also can avoid simple rule to cause the reduction of pirate difficulty.
2. original password is encoded, the effect of this coding is that original password is carried out digital encryption one time, this coding has one-way, and it cracks need very big calculated amount, and its decoding algorithm is very simple, like this, after coding rule is determined, can contain the coding rule of a plurality of patterns in the decoded ip, and support composite mode to encrypt, can realize the corresponding password independently of each CD like this, increase the security of password; Each pattern has different parameters, and pattern and parameter are selected for this CD separately by content supplier and set, and content supplier encodes to original password with the pattern and the parameter of cryptography rule and oneself selection, obtains the Crypted password of numeral.
3. numerical ciphers is converted to the simulation password, the rule of this conversion comprises signal definition mode and the pattern of simulating password, the parameter of this transformation rule is set for this CD separately by content supplier, stamper manufacturer changes numerical ciphers according to the parameter of transformation rule and content supplier's setting, obtains simulating password.
4. after stamper manufacturer will simulate password and data of optical disk after the scrambling mixes, the mode according to the piece coupling recorded on the stamper with the method for synchronization or asynchronous system according to specific requirement.
5. understand: the simulation password is carried out numerical ciphers after AD is converted to encryption by the dedicated processes module that is integrated in system's master chip, obtain the original password of CD then with deciphering IP deciphering, with this original password data of optical disk is carried out descrambling again, obtain end user data.Because this process is handled by the module that is encapsulated in the one chip, so can not cause password loss in transfer process, decrypting process and descrambling process.
The digital encryption of original password is privately owned (content supplier), decryption method is publicly-owned (IC manufacturer), the analog encryption of password is privately owned (disc manufacturer), decryption method is publicly-owned (IC manufacturer), the data scrambling method is privately owned (content supplier), and de-scrambling method is publicly-owned (IC manufacturer).
The present invention mainly comprises following content:
1, original password multi-enciphering rule
This rule adopts and falls into unilateral gate or similarly coding method, and its cataloged procedure is privately owned, determines the parameter of its coding characteristic to be decided by content provider.Decoded ip is publicly-owned, can be integrated in the master chip by the chip manufacturer of authorizing.Because the coding method of adopting has characteristic of unidirectional, it cracks need very big calculated amount, so just makes that the difficulty of piracy increases greatly, and, owing to be independent password of each CD,, also can not cause the collapse of total system even the password of a CD is cracked.
2, numerical ciphers converts the transformation rule of simulation password to
This rule is according to the frequecy characteristic and the amplitude Characteristics of analog quantity, adopt the method for frequency modulation (PFM) or which amplitude modulation, convert numerical ciphers to one group of simulating signal, because the accurate difficulty of reproduction of simulating signal is very big, add piece matching with data, if do not know numerical ciphers and transformation rule, the very difficult simulating signal that will spread all over whole CD accurately intactly duplicates out.So be difficult to dish be copied with the mode realization dish of read signal.
3, the simulation password on CD loading and read
The simulation password is recorded on the CD according to session with the data through scrambling, and simulating signal can be synchronous or asynchronous with data block.Wherein, simulating signal can adopt axially or medium physics changing features radially (as refractive index or reflectivity or polarization state) realize, also can realize with code layer independently.When reading, data-signal with after code signal separates, is finished the AD conversion of code signal by the separate processor module, the precision of this conversion will guarantee the correctness of password.
4, carry the data scrambling technology of password based on the piece matching disc
Similar with the scrambling principle of Digital Television, the data scrambling that synchronous disk carries password is to adopt synchronous or asynchronous password that data are carried out the piecemeal scrambling, and the data after the scrambling can be carried out the reading and writing data of ordinary meaning, but, if descrambling not, what obtain will be a pile mess code, without any practical significance.Simultaneously, the password of piecemeal scrambling will take into full account the influence that error code causes, and avoid the password mistake to cause the inefficacy of whole data block.Because the ability of flush bonding processor constantly strengthens at present, there has not been the calculating bottleneck in data de-scrambling.
5, the copyright the monitored mutual confidence-building mechanism between chip manufacturer, stamper manufacturer and the content supplier
Numerical ciphers converts the simulation password to and realizes that by the selection of application-specific integrated circuit according to pattern and parameter each application-specific integrated circuit all has independent sequence number, and this sequence number will be recorded on stamper and the CD.Because this cryptographic system relates to chip manufacturer, stamper manufacturer and content supplier, need between the three, set up a kind of copyright mutual confidence-building mechanism of monitoring, this mechanism comprises the management and the coordination of password encryption technology, the mandate of stamper manufacturer and chip manufacturer and management, CD copyright monitoring technique.
The invention has the beneficial effects as follows:
1, multi-enciphering and wherein have the simulation password to increase the difficulty of optical media replication.
2, independent password of each CD even the password of a CD is cracked, also can not cause the collapse of whole encryption system.
3, signal scrambling technique has increased the difficulty that user data is deciphered synchronously.
4, mechanism helps setting up the copyright mutual confidence-building mechanism that can monitor with tactful separating.
Description of drawings
Fig. 1, be the optical disc storage of the embodiment of the invention data scrambling, separate the read procedure block diagram.
Embodiment
Below in conjunction with concrete implementation step content of the present invention is described in further detail, but protection scope of the present invention obviously is not limited to following examples.
1, the content of being made at needs by content supplier determines to meet certain regular original password.11001xxxxxxx01011 for example.Content supplier carries out digital interference with this original password to data simultaneously.
2, the encryption system pin is according to the carry out digital encryption of One-Way Encryption principle to original password, obtains the numerical ciphers behind the group encryption after the encryption, as: 1011XXXXXXXXXXX ... XXXXXXXXXX11001.This ciphering process is responsible for by content supplier.
3, encryption system converts numerical ciphers to the simulation password according to the One-Way Encryption principle, obtains a concrete analog waveform after the conversion, for example, and the stack of the trigonometric function of different frequency and amplitude.This ciphering process is responsible for by disc manufacturer.
4, during descrambling, behind front end mask data and the password, analog waveform is carried out numerical ciphers after AD is converted to encryption by the dedicated processes module that is integrated in system's master chip, as: 1011XXXXXXXXXXX ... XXXXXXXXXX11001.Obtain the original password of CD then with deciphering IP deciphering, for example 11001xxxxxxx01011 carries out descrambling with this original password to data of optical disk again, obtains end user data.
5, numerical ciphers converts the encryption IC that simulates password to special sequence number, this sequence number is global unique sign, can follow the tracks of stamper manufacturer by this sign, encrypting IC has only the IC manufacturer through special permission to make, content supplier is entitled to know this sequence number, simultaneously, this sequence number appears at pressure on stamper and the CD.
Claims (2)
1, a kind of data scrambling, deciphering method that is used for optical disc storage is characterized in that:
User data is adopted the original password scrambling;
The original password that the user data descrambling needs through behind the multi-enciphering as the cdrom encryption password;
The cdrom encryption password---the simulation password is one group of simulating signal, and this simulating signal can be followed the data-track on the CD, adopts axially or light signal feature radially writes down and reads, and also can occur with the form of an independent simulating signal code layer; Original password becomes the approach of simulation password through multi-enciphering: original password → (digital encryption) numerical ciphers → (conversion is encrypted) simulation password;
User data after the scrambling is recorded on the CD in the mode of separating or mixing with the simulation password, also adopts synchronous or asynchronous sequential to carry out during deciphering;
Adopt the application-specific integrated circuit sequence number to manage coordinating content provider, relation between stamper manufacturer and the chip manufacturer, this application-specific integrated circuit is responsible for converting the numerical ciphers after encrypting to the simulation password, and each IC has a special sequence number, and this sequence number is forced to appear on stamper and the CD.
2, the data scrambling of optical disc storage as claimed in claim 1, deciphering method is characterized in that concrete implementation step is as follows:
1., determine to meet the original password of certain rule by content supplier, this original password should be one group of 0,1 character string, according to the requirement difference of user to secret grade, can adopt the original password of different length, total principle is that the last simulation password that generates will cover whole CD;
2., original password is encoded, the effect of this coding is that original password is carried out digital encryption one time, and this coding has one-way; After coding rule is determined, the coding rule that can contain a plurality of patterns in the decoded ip, and support composite mode to encrypt, each pattern has different parameters, pattern and parameter are selected for this CD separately by content supplier and are set, content supplier encodes to original password with the pattern and the parameter of cryptography rule and oneself selection, obtains the Crypted password of numeral;
3., numerical ciphers is converted to the simulation password, the rule of this conversion comprises signal definition mode and the pattern of simulating password, the parameter of this transformation rule is set for this CD separately by content supplier, stamper manufacturer changes numerical ciphers according to the parameter of transformation rule and content supplier's setting, obtains simulating password;
4., after stamper manufacturer will simulate password and data of optical disk after the scrambling will mix, the mode according to the piece coupling records on the stamper with the method for synchronization or asynchronous system according to specific requirement;
5., understand: the simulation password is carried out numerical ciphers after AD is converted to encryption by the dedicated processes module that is integrated in system's master chip, obtain the original password of CD then with deciphering IP deciphering, with this original password data of optical disk is carried out descrambling again, obtain end user data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610018258XA CN100426405C (en) | 2006-01-19 | 2006-01-19 | Data scrambling and decoding method for optic disc storage |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200610018258XA CN100426405C (en) | 2006-01-19 | 2006-01-19 | Data scrambling and decoding method for optic disc storage |
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| CN1822171A true CN1822171A (en) | 2006-08-23 |
| CN100426405C CN100426405C (en) | 2008-10-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543121A (en) * | 2010-12-29 | 2012-07-04 | 尹亮 | Compact disc (CD) reading method, computer and CD driver |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1439534A3 (en) * | 1995-10-09 | 2006-11-29 | Matsushita Electric Industrial Co., Ltd. | Optical disk, optical recorder, optical reproducer, cryptocommunication system and program license system |
| JP2003134106A (en) * | 2001-10-22 | 2003-05-09 | Victor Co Of Japan Ltd | Encryption method, decoding method and apparatus, and information recording medium |
| EP1500103A2 (en) * | 2002-04-10 | 2005-01-26 | Koninklijke Philips Electronics N.V. | Apparatus and method for rendering user data |
| AU2003275695A1 (en) * | 2002-11-20 | 2004-06-15 | Sony Corporation | Recording system and method, recording device and method, input device and method, reproduction system and method, reproduction device and method, recording medium, and program |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543121A (en) * | 2010-12-29 | 2012-07-04 | 尹亮 | Compact disc (CD) reading method, computer and CD driver |
| CN102543121B (en) * | 2010-12-29 | 2015-01-07 | 尹亮 | Compact disc (CD) reading method, computer and CD driver |
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| CN100426405C (en) | 2008-10-15 |
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Effective date of registration: 20091211 Address after: 1037, Luo Yu Road, Wuchang, Wuhan, Hubei. Zip code: 430074 Co-patentee after: Wuhan Guanggu Gaoqing Technology Development Co., Ltd. Patentee after: Huazhong University of Science and Technology Address before: 1037, Luo Yu Road, Wuchang, Wuhan, Hubei. Zip code: 430074 Co-patentee before: Cha Li Patentee before: Huazhong University of Science and Technology |
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Granted publication date: 20081015 Termination date: 20170119 |