JP3923635B2 - CD security system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a CD creation system that writes data to a CD (CD-R / RW disc), and more particularly to a CD security system that enables security management of data using a password.
[0002]
[Prior art]
Conventionally, in order to provide security for data on a CD, a unique CD format or unique hardware has been required (for example, JP-A-8-7340).
As another security measure, a method of scrambling data to be written itself has been performed.
[0003]
[Problems to be solved by the invention]
As described in the prior art, in order to realize a CD security system, a dedicated system having a unique CD format or unique hardware is required.
However, the conventional method requires a dedicated system equipped with a unique CD format, unique hardware, etc. in order to realize a CD security system, and it cannot be configured for general use. There was a problem.
Further, when encryption such as scramble is performed on the data itself, there is a problem that high technology and knowledge about encryption and the like are required, so that it cannot be easily realized.
In addition, normally, a single CD can only be given one type of security, and a plurality of types of security cannot be applied.
[0004]
The first object of the present invention is to solve these problems and realize a CD security system that can manage a plurality of useful data on one CD with a plurality of passwords (claims). Claims 1 and 5).
Another object of the present invention is to realize a CD security system capable of easily creating a CD subjected to security management with a password without departing from a general-purpose CD format. ).
Furthermore, a third problem is to realize a CD security system that can easily create a CD that can make useful information invisible with a general-purpose CD-ROM reader or the like without departing from a general-purpose CD format. (Invention of claim 4)
[0005]
[Means for Solving the Problems]
The invention of claim 1A first step of selecting data to be written to the CD-R or CD-RW, allocating the data to a plurality of tracks, and setting a password, and a second step of starting writing when the password setting is completed As the first track, CD format information including a volume descriptor and data structure information indicating that “data does not exist” is created, and is converted into a CD image to form the CD-R or CD as one track. -For the third step of writing to the RW and one of the tracks allocated in the first step, the volume descriptor, the structure information of the write data allocated to the track, and the setting in the track To create CD format information consisting of password sectors that hold the passwords A fourth step of creating a CD image comprising the D format information and the selected data, and a fifth step of adding the CD image of the track created in the fourth step to the CD-R or CD-RW A sixth step of repeatedly executing the steps, the fourth step and the fifth step until all tracks allocated in the first step are written, and the first to sixth steps. And a seventh step of closing a session composed of tracks recorded on the CD-R or CD-RW.
[0006]
  The invention of claim 2 is a CD-R.Or CD-RWMeans for selecting a plurality of devices storing data to be written to, means for selecting data to be written from the selected devices, and a CD-R based on the selected informationOr CD-RWFor creating format information of CD-ROM and CD-R based on the format informationOr CD-RWAnd a formatted CD-ROr CD-RWA CD creating system comprising means for writing the selected data inA first means for enabling selection of data to be written to the CD-R or CD-RW, allocation of the data to a plurality of tracks, and setting of a password; The second means for starting, and the first track, CD format information consisting of volume descriptor and data structure information indicating that “data does not exist” is created and converted into a CD image as one track. The third means for writing to the CD-R or CD-RW and the volume descriptor and the structure information of the write data assigned to the track for one of the tracks assigned by the first means And CD format information consisting of a password sector that holds the password set for the track A fourth means for creating a CD image comprising the CD format information and the selected data, and a CD image of the track created by the fourth means on the CD-R or CD-RW. Fifth means for appending, sixth means for repeatedly executing the fourth means and the fifth means until all tracks allocated by the first means are written, and the first to second means And a seventh means for closing a session composed of tracks recorded on the CD-R or CD-RW by means of 6.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the CD security system of the present invention will be described in detail with reference to the drawings.
Since the CD security system according to the present invention can be broadly divided into creation of a security CD and reading of a security CD, in the first embodiment, creation of a CD will be described below, and second implementation will be described. In this embodiment, securing of security at the time of reading the created CD will be described.
Usually, when a CD is mounted on a general-purpose CD-ROM reader constituted by a general-purpose CD-ROM drive, a general-purpose reading driver, and a general-purpose computer, the first track information always present on the CD is in accordance with the CD-ROM standard. Is mounted on the OS.
In the present invention, paying attention to this point, when a CD created by a security CD creation program is inserted into a general-purpose CD-ROM reader, it is mounted on the OS as an empty disk in which no data is stored. Yes.
That is, since the general-purpose CD-ROM reader cannot access useful data held in other tracks in the security CD, the security of the CD can be guaranteed.
[0011]
First embodiment
ThisThe CD security system of the present invention makes it possible to manage a plurality of useful data on one CD with a plurality of passwords.point,And password security management without departing from the general-purpose CD formatCD andCan make useful information invisible with general-purpose CD-ROM reader etc. CDIt is characterized in that it can be created easily. First, the security CD creation system will be described.
[0012]
FIG. 2 is an external view showing an example of the configuration of the main part of the security CD creation system in the CD security system of the present invention. In the figure, PC indicates a general-purpose computer, Dr indicates a general-purpose CD-R drive, and SCSI indicates a SCSI (interface) device.
[0013]
The security CD creation system shown in FIG. 2 includes a general-purpose computer PC and a general-purpose CD-R drive Dr.
The general-purpose computer PC and the general-purpose CD-R drive Dr are connected by a SCSI device or the like.
The general-purpose computer PC is equipped with a security CD creation program.
The operator performs selection of write data, setting of an arbitrary password, execution of writing, and the like by operating the security CD creation program.
[0014]
FIG. 3 is a functional block diagram showing an example of an embodiment of the main configuration of the security CD creation system shown in FIG. In the figure, 1 is a CPU, 2 is a CD-R / RW disc writing device, 3 is a RAM, 4a to 4c are write data storage devices, 5 is a program storage unit, 6 is an intermediate data storage unit, and 7 is CD image data storage. , 8 is a keyboard, 9 is a mouse, 10 is a display control device, 11 is a display, and 12 is a system bus.
[0015]
The function of each part is roughly as follows.
The CPU 1 uses the program stored in the program storage unit 5 corresponding to the command input from the keyboard 8 or mouse 9, via the system bus 12, the keyboard 8, the RAM 3, the display control device 10, the CD-R / RW disk writing device 2, etc. The central processing means has a function of controlling the entire system as a whole and executing a predetermined calculation, processing, and the like.
The CD-R / RW disc writing device 2 itself includes a CPU and a RAM (not shown), and temporarily holds write data transferred in accordance with an instruction from the CPU 1 of the system shown in FIG. A write data buffer is provided, and a CD disc is created.
[0016]
The RAM 3 is storage means for storing information necessary for CD creation, for example, information on one of the selected write data storage devices 4a to 4c, information on selected write data in the device, and the like. is there.
Further, it is also used as a storage means when converting various information or when a program instructs the CD-R / RW disc writing device 2 to write data, and partially creates CD image data. .
The write data storage devices 4a to 4c are devices for storing data to be written, and FIG. 3 shows a case where three write data storage devices 4a to 4c are provided. Each of the storage devices 4a to 4c stores actual write data used for CD disc creation. These write data storage devices 4a-4c may be four or more, or may be two.
[0017]
Each of the write data storage devices 4 a to 4 c can be selected in accordance with an instruction from the keyboard 8 or the mouse 9.
The program storage unit 5 is a storage means for storing a program for controlling the system shown in FIG. 3, and stores a program for creating a CD disc mounted in the CD security system of the present invention.
The intermediate data storage unit 6 is storage means for holding data to be written on the CD disc and table of contents information in a state converted into intermediate data.
The CD image data storage unit 7 is a device that is used when a CD image is actually created once and then written to the CD-R / RW disc writing device 2.
[0018]
  The keyboard 8 and mouse 9 are input means for selecting or inputting a write data device necessary for an operator's CD disc creation operation and system control, and further selecting or inputting write data from the selected device. It has a function. The display control device 10 has a function for controlling display of the display 11 such as a CRT or LCD, and displays information stored in the RAM 3 and information such as window and icon patterns corresponding to various functions. 11 is visibly displayed on the screen. The above is the outline of the function of each part of the security CD creation system of the present invention.3This is a hardware configuration common to the present invention.
[0019]
next,FIG.Regarding the security CD creation system shown in FIG. 2, the operation of the security CD creation program installed in the system will be described.
1) When the security CD creation program installed in the system starts, the operator selects data to be written to the CD, allocates the data to multiple tracks, and sets a password for each track.Do.When password setting is completed, writing is started.
2) As the first track, this program creates CD format information by creating CD format information consisting of a volume descriptor and data structure information indicating that “data does not exist”.To do.
3) Write the CD image created in step 2) onto a CD as one track.
4) Next, the program, for each of the tracks allocated in the previous 1), the volume descriptor, the structure information of the write data allocated to the track, and the password set in the track CD format information consisting of the password sector that holds the CD format information, and a CD image consisting of the CD format information and the selected data.
5) Add the CD image of the track created in the previous 4) to the previous CD.Go.
6) Repeat operations 4) to 5) until all tracks allocated in 1) are written.The
7) After the operation in 6) is completed, the session is closed. The operation of the security CD creation program installed in the security CD creation system of FIG. 3 described above is shown in the flowchart.
[0020]
FIG. 1 is a flowchart showing the main processing flow of a security CD creation program installed in the CD security system of the present invention. In the figure, # 1 to # 10 indicate steps.
[0021]
In the flow of FIG. 1, writing of track 1 (meaning track number 1) by the system of the present invention is executed by the processing of steps # 3 to # 5, and track N is executed by the processing of steps # 6 to # 8. Writing of (≠ 1) is executed.
In step # 1, the operator selects data to be written on the CD, assigns the data to a plurality of tracks, and sets a password.
In step # 2, writing is started.
[0022]
In step # 3, a CD image (track 1) having CD format information indicating that “data does not exist” is created.
In step # 4, the created CD image (track 1) is written on the CD.
In step # 5, the writing of the track (track 1) is completed.
With the above steps # 3 to # 5, the writing operation for the track 1 is completed, and then the writing operation for the track N (≠ 1) other than the track 1 is performed.
[0023]
In step # 6, a CD image (track N) having data to be written on the CD and CD format information including a password sector is created.
In step # 7, the created CD image (track N) is written on the CD.
In step # 8, writing of the track (track N) is completed.
The write operation on track N is completed by the above steps # 6 to # 8.
In step # 9, it is checked whether or not writing to all tracks has been completed. If it has not yet been completed, the process returns to the previous step # 6 and the same processing is performed.
If it is detected in step # 9 that writing to all tracks has been completed, the process proceeds to step # 10, the session is closed, and the flow of FIG.
[0024]
Next, an example of the data arrangement of a CD created by the CD security system of the present invention will be described.
[0025]
FIG. 4 is a diagram showing an example of data arrangement of a CD created by writing a security CD creation program in the CD security system of the present invention.
[0026]
thisFIG.Shows the data arrangement of track 1 to track 3. In general-purpose CD-ROM reading system, it is always the latesttruckData structures are mounted. thisFIG.In the case of the data arrangement, since the information that “no data (file and directory) exists” is held in the path table of sector X of track 1, there is no file and directory on the OS. It seems to not do. The details are listed below.
[0027]
11) A volume descriptor group holding volume information is allocated from the sector 16 of each track. Some volume descriptors have theirtruckThere is an area that holds start position information of a path table that stores data structure information indicating the structure of files and directories that exist.
12) Of the tracks of the previous 11), the track N (≠ 1) other than the track 1 is set by the operator in the sector next to the volume descriptor group of the previous 11) according to the security CD creation program. Password is keptThe
[0028]
13) Of the tracks of the previous 11), the tracks other than the track 1 hold the path table group from the sector next to the password sector holding the password of the previous 12).Yes.
14) The data written by the selection of the operator is held in the path table group in the previous 13) and the sector group after the other additional information holding unit.
15) There is no password on track 1, and the path table of track 1 holds information indicating that no data exists.Yes.
[0029]
In general, when a CD is mounted on a general-purpose CD-ROM reader constituted by a general-purpose CD-ROM drive, a general-purpose reading driver, and a general-purpose computer, the first track information always present on the CD is in accordance with the CD-ROM standard. Is mounted on the OS. In the first embodiment, when the first track is accessed,The track 1 path table holds information indicating that no data exists.Information indicating that no data exists is displayed.Details of the data reading will be described in the second embodiment.
[0030]
Second embodiment
AheadIn the first embodiment, a plurality of useful data on one CD is managed by a plurality of passwords, and the operation of creating a CD by the CD security system of the present invention has been described. The second embodiment has a feature in the control when reading the CD created by the processing described in the first embodiment, and inputs the password and matches the input password. Including passwordtruckThe data of can be mounted. First, a security CD reading system will be briefly described.
[0031]
FIG. 5 is an external view showing an example of the configuration of the main part of the security CD reading system in the CD security system of the present invention. The reference numerals in the figure are the same as those in FIG. 2, and Dr2 indicates a general-purpose CD-ROM drive.
[0032]
thisFIG.The security CD reading system shown in FIG. 1 is composed of a general-purpose computer PC and a general-purpose CD-ROM drive Dr2. The hardware configuration of the general-purpose computer PC is basically the same as that shown in FIG. The general-purpose computer PC and the general-purpose CD-ROM drive Dr2 are connected by a SCSI device or the like. In the case of this security CD reading system, the general-purpose computer PC is loaded with a security CD reading program. This security CD reading program allows you to enter passwords,truckMount to the OS.
[0033]
As described in the first embodiment, when a CD is mounted on a general-purpose CD-ROM reader constituted by a general-purpose CD-ROM drive, a general-purpose reading driver, and a general-purpose computer, the CD-ROM standard is normally used. Thus, the first track information that always exists on the CD is mounted on the OS.
That is, the general-purpose CD-ROM reader cannot access useful data held in other tracks in the security CD, and as a result, it is possible to guarantee the security of the CD.
[0034]
FIG. 6 is a diagram for explaining the read operation of the created security CD in the CD security system of the present invention shown in FIG.
[0035]
21) After this security CD reading program is started, the operator inputs a password suitable for the track desired to be read.
22) This program reads the start sector position of the path table from the volume descriptor of the second track of the inserted CD.
Next, the password held in the sector (password sector) immediately before the path table start sector read earlier is read and compared with the password input by the operator.
[0036]
23) If both passwords match as a result of the comparison in 22) above,truckMount the contents of the program on the OSThe
24) If the passwords do not match, the password held in the password sector of the track next to the password read target is read and compared with the password input by the operator in the previous 21).
25) The above comparison operations 23) to 24) are repeated until the passwords match.
[0037]
26) If the password does not match the last track on the CD to be read, a message or the like indicating that fact is displayed, and the operating operator is notified.
An operation by the security CD reading program installed in the security CD creation system of FIG. 6 described above is shown in the flowchart.
[0038]
FIG. 7 is a flowchart showing the main processing flow of the security CD reading program installed in the CD security system of the present invention. In the figure, # 11 to # 16 indicate steps.
[0039]
FIG. 7 shows a case where data is written a plurality of times for each track unit on one CD as described in FIG.
In step # 11, the user inputs a password for a desired track.
In step # 12, the program compares the input password with the password n (= 2) of the track “No. n (= 2)”.
If the two passwords match, the track data is mounted on the OS in step # 13.
[0040]
If the passwords do not match, the process proceeds to step # 14 to check whether the next track exists.
When the next track exists, in step # 15, n is incremented by "+1", and the process returns to the previous step # 12. The entered password and the password n + 1 of the track "No.n + 1" are Compare.
The above processing is executed until the passwords match.
[0041]
If the passwords do not match as a result of the comparison in step # 12 and it is detected in step # 14 that the next track does not exist, the process proceeds to step # 16.
In step # 16, a message “no data (file and directory) exists” is displayed, and the flow of FIG. 7 ends.
As described above, in the second embodiment, when a CD created by the CD security system described in the first embodiment is read, the password is input and matches the input password. The track data including the password to be mounted can be mounted.
Therefore, it is possible to show different track data to different users with one CD.
[0042]
【The invention's effect】
Of this embodimentIn the CD security system, when writing selected data to a CD, different volume information, different logical file structure information, and different data can be written to each of a plurality of different tracks. Therefore, it is possible to write a plurality of file systems for a plurality of users on one CD.
[0043]
Also,When writing the selected data to the CD, for each of a plurality of different tracks, the user inputs a password, and the password is set in the sector next to the volume information holding area where the volume information on each track is written. Means for writing and means for writing the password in the next sector of the volume information holding area where the volume information on each track is written are provided. ThereforeMultipleSecurity management of multiple file systems with a number of passwords becomes possible.
[0044]
Also,When writing the selected data, for each of a plurality of different tracks, the logical file structure information of the data to be written, the means for writing the data to be written, and the volume information from the sector next to the sector where the password was written Means for writing the start sector position of the logical file structure information holding area in the logical file structure information starting sector holding unit in the area is provided. ThereforeCThe sector that holds the previous password information can be written on the CD in a format that does not deviate from the D format standard.
[0045]
Also,When the selected data is written, means for writing logical file structure information indicating that no data exists in the logical file structure information holding area in the first track on the CD among the plurality of tracks is provided. Therefore, on a general-purpose CD-ROM reading systemAnd CDData in the second and subsequent tracks written on the CD by the security system can be hidden.
[0046]
  CWhen reading a CD created by the D security system, there is provided means for inputting a password and mounting track data including a password that matches the entered password. ThereforeOneA single CD makes it possible to show different tracks of data to different users.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a main processing flow of a security CD creation program installed in a CD security system of the present invention.
FIG. 2 is an external view showing an example of a main configuration of a security CD creation system in the CD security system of the present invention.
FIG. 3 is a functional block diagram showing an example of an embodiment of the main configuration of the security CD creation system shown in FIG. 2;
FIG. 4 is a diagram showing an example of data arrangement of a CD created by writing a security CD creation program in the CD security system of the present invention.
FIG. 5 is an external view showing an example of a main configuration of a security CD reading system in the CD security system of the present invention.
6 is a diagram for explaining a read operation of a created security CD in the CD security system of the present invention shown in FIG. 5; FIG.
FIG. 7 is a flowchart showing the main processing flow of the security CD reading program installed in the CD security system of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... CPU, 2 ... CD-R / RW disc writing device, 3 ... RAM, 4a-4c ... Writing data storage device, 5 ... Program storage part, 6 ... Intermediate data storage part, 7 ... CD image data storage unit, 8 ... keyboard, 9 ... mouse, 10 ... display control device, 11 ... display

Claims (2)

A first step of selecting data to be written to the CD-R or CD-RW, allocating the data to a plurality of tracks, and setting a password;
When the setting of the password is completed, a second step of starting writing,
As the first track, CD format information consisting of a volume descriptor and data structure information indicating that “data does not exist” is created, and is converted into a CD image to form the CD-R or CD-RW as one track. A third step of writing to
For one of the tracks allocated in the first step, a volume descriptor, structure information of write data allocated to the track, and a password sector that holds a password set for the track A fourth step of creating CD format information and creating a CD image comprising the CD format information and selected data;
A fifth step of adding a CD image of the track created in the fourth step to the CD-R or CD-RW;
A sixth step of repeatedly executing the fourth step and the fifth step until all tracks allocated in the first step are written;
A seventh step of closing a session consisting of tracks recorded on the CD-R or CD-RW in the first to sixth steps;
A CD creation method characterized by comprising: Means for selecting a plurality of devices storing data to be written to CD-R or CD-RW; means for selecting data to be written from the selected devices; and CD-R or CD- based on the selected information Means for creating RW format information, means for formatting a CD-R or CD-RW based on the format information, and means for writing the selected data in the formatted CD-R or CD-RW In the CD creation system that
First means for enabling selection of data to be written to the CD-R or CD-RW, allocation of the data to a plurality of tracks, and setting of a password;
A second means for starting writing upon completion of the password setting;
As the first track, CD format information consisting of a volume descriptor and data structure information indicating that “data does not exist” is created, and is converted into a CD image to form the CD-R or CD-RW as one track. A third means of writing to
For one of the tracks allocated by the first means, it comprises a volume descriptor, structure information of write data allocated to the track, and a password sector that holds a password set for the track. A fourth means for creating CD format information and creating a CD image comprising the CD format information and selected data;
Fifth means for appending the CD image of the track created by the fourth means to the CD-R or CD-RW;
Sixth means for repeatedly executing the fourth means and the fifth means until all the tracks allocated by the first means are written;
Seventh means for closing a session comprising tracks recorded on the CD-R or CD-RW by the first to sixth means;
A CD creation system characterized by comprising:

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