JP2002359806A - Authentication method and information reproduction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of information reproduction by enabling limit information reproduction of storage media, even when use conditions of information reproducing equipment, for instance, use areas are changed. SOLUTION: An equipment identification code of the information reproducing equipment and a media identification code of a memory card 10 respectively consist of a fixed code and an area code, and the area code of the equipment identification code between them is updated, on the basis of position information acquired from a mobile communication network. In the case of performing mutual authentication control between the information reproducing equipment and the memory card 10, the equipment identification code including the area code to be updated and the media identification code are used, so as to conduct authentication processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reproducing apparatus such as a video player and an audio player and, when reproducing content information stored in a storage medium using the information reproducing apparatus, the information reproducing apparatus. The present invention relates to an authentication method for performing an authentication process between a storage medium and a storage medium.

[0002]

2. Description of the Related Art Generally, a DVD (Digital Versatile Diode) is used.
Content information stored in storage media such as sc) and memory cards has usage restrictions defined for each country or region.

Therefore, when reproducing the content information of the storage medium, authentication is performed between the storage medium and the information reproducing device prior to the reproduction. This authentication is performed based on an identification code including an area code registered in advance in the information reproducing device and an identification code registered in advance in the storage medium. Then, as a result of the authentication, if the use of the storage medium by the information reproducing apparatus in use is approved, the reproduction of the content information is permitted, and if not, the reproduction of the content information is invalidated.

[0004]

However, such a conventional authentication method is effective when a storage medium is brought into another country or region and information is to be reproduced by an information reproducing device in that country or region. It is. However, if you bring storage media with information playback equipment to another country or region,
The information reproduction of the storage medium cannot be invalidated. Recently, as information reproducing devices, mobile communication terminals such as mobile phones and personal digital assistants (PDAs), and various types of in-vehicle devices such as car stereos and car navigation systems have rapidly spread. Such a portable information reproducing apparatus generally moves together with the user, so that the above-described inconvenience is likely to occur.

The present invention has been made in view of the above circumstances. It is an object of the present invention to effectively limit information reproduction of a storage medium even when use conditions of an information reproduction device change. Accordingly, it is an object of the present invention to provide an authentication method and an information reproducing device that improve the reliability of information reproduction.

[0006]

In order to achieve the above object, an authentication method according to the present invention comprises a first identification code comprising a fixed part and a variable part for an information reproducing apparatus and a storage medium prior to use thereof. The second identification code is registered, and every time the usage condition of the information reproducing device changes, the variable part of the first identification code is changed to a code corresponding to the changed usage condition. Then, when a request for reproducing information stored in the storage medium is input to the information reproducing device, prior to reproduction of the information, the first identification code after the change is transmitted between the information reproducing device and the storage medium. A mutual authentication procedure is executed based on the second identification code in accordance with a predetermined algorithm, and it is determined whether or not to permit reproduction of information according to the execution result of the mutual authentication procedure. .

As a method of changing the first identification code in the information reproducing apparatus, for example, information indicating a place of use of the information reproducing apparatus is obtained, and the first identification code is obtained based on the acquired information indicating the place of use. If the information reproducing device has a function of connecting to a communication network via a communication channel, or based on the identification information of the network operator notified from the communication network, The one that changes the variable part of the first identification code, and the area transmitted from the mobile communication network for each area when the information reproducing device has a function of connecting to the mobile communication network via a wireless channel. Changing the variable portion of the first identification code based on the identification information. When the information reproducing device has a time-measuring means, the first identification code is changed for each time zone based on the time output of the time-measuring means. Change the variable part Those that can be considered.

Therefore, according to the present invention, when the use condition of the information reproducing device changes, the variable portion of the first identification code registered in the information reproducing device is automatically changed. For this reason, for example, a storage medium is brought into another region or country with an information reproducing device, an information reproducing device is connected to a communication network other than a predetermined communication network, and an attempt is made to use the information reproducing device, Even if information is to be reproduced during the time period, the information reproduction can be invalidated by an authentication procedure between the information reproducing device and the storage medium before the reproduction. In other words, even when a mobile communication terminal such as a mobile phone or a PDA, or various in-vehicle devices used for a car stereo or a car navigation system is used as an information reproducing device, a region or a country in which information on a storage medium can be reproduced is limited. can do.

Further, according to the present invention, when performing a mutual authentication procedure between the information reproducing apparatus and the storage medium, first, all bits of the first identification code registered in the information reproducing apparatus and the first identification code registered in the storage medium are read. Mutual authentication is performed based on all the bits of the second identification code. If the authentication result does not permit information reproduction, then mutual authentication is performed based on the fixed part of the first identification code and the fixed part of the second identification code. Also features.

According to such an authentication method, if reproduction permission is not obtained in the first authentication procedure using all bits including the variable portion, the variable portion of the first identification code is removed. A second authentication procedure using only the fixed part is performed. For this reason, even when attempting to reproduce an existing storage medium in which the second identification code having no variable portion is registered, it is possible to reproduce the stored information.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit block diagram showing a configuration of an information reproducing apparatus according to one embodiment of the present invention.

The information reproducing apparatus of this embodiment is an audio player having a network connection function, and includes a radio section 1, a baseband section 2, an input / output section 3, and a power supply section 4.

First, the input / output unit 3 has a liquid crystal display (LC)
D) 31, a speaker 32, a key input section 33, and a card slot (not shown) are provided. The key input unit 33 includes a key group for audio reproduction such as selection, reproduction, and stop of audio data, and a key group necessary for accessing a mobile communication network (not shown). The memory card 10 is detachably mounted in the card slot. The memory card 10 uses a flash EEPROM as a storage element, and stores various types of content information, for example, audio data such as music downloaded from a music site on the Internet, and image data captured by a camera.

The baseband unit 2 includes a main control unit 21 and L
CD control unit 22, audio decoder 23, memory card interface (memory card I / F) 24
And a memory card detection unit 25.

The LCD controller 22 supplies the display data output from the main controller 21 to the LCD 31 for display. The display data includes download data received from a network (not shown), image data read from a memory card, and information indicating an operation state of the device itself.

The audio decoder 23 includes a main control unit 21
The audio data such as music read out from the memory card 10 is decoded by the control of the above, and the audio signal reproduced by the decoding process is supplied to the speaker 32 to be loudspeaked and output. Although only one speaker 32 is shown in the figure, two speakers 32 are actually used to enable stereo reproduction.
Are provided.

The memory card I / F 24 includes a main controller 21
To read the stored data from the memory card 10 and write the data to the memory card 10. The memory card detection unit 25 detects insertion and removal of the memory card 10 in the card slot, and notifies the main control unit 21 of the detection signal.

The radio section 1 is for accessing a mobile communication network (not shown), and includes an antenna 11, an antenna duplexer (DUP) 12, a receiving circuit (RX) 13, a frequency synthesizer (SYN) 14, , Transmission circuit (TX)
15. That is, a radio frequency signal arriving via a radio channel from a base station of a mobile communication network is received by an antenna 11 and then input to a receiving circuit 13 via an antenna duplexer 12. The receiving circuit 13 includes a high-frequency amplifier, a frequency converter, and a demodulator. Then, after low-noise amplification of the radio signal with a low-noise amplifier, the frequency converter converts the frequency to a reception intermediate frequency signal or a reception baseband signal by mixing with a reception local oscillation signal generated from the frequency synthesizer 14. The output signal is digitally demodulated by a demodulator. As the demodulation method,
For example, a quadrature demodulation method corresponding to the QPSK method is used. The frequency of the reception local oscillation signal generated by the frequency synthesizer 14 is specified by the main control unit 21.

On the other hand, the transmission data output from the main control section 21 is input to the transmission circuit 15 of the radio section 1. The transmission circuit 15 includes a modulator, a frequency converter, and a transmission power amplifier. The transmission data is digitally modulated by a modulator, and then mixed with a transmission local oscillation signal generated by a frequency synthesizer 14 by a frequency converter and frequency-converted into a radio frequency signal. As a modulation method, a QPSK method is used. Then, the generated transmission radio frequency signal is amplified to a predetermined transmission level by a transmission power amplifier, supplied to an antenna 11 via an antenna duplexer 12, and transmitted from the antenna 11 to a base station. .

The power supply section 4 is provided with a battery 42 such as a lithium ion battery, a charging circuit 41 for charging the battery 42, and a voltage generation circuit (PS) 43. The voltage generation circuit 43 includes, for example, a DC / DC converter, and generates a predetermined power supply voltage Vcc based on the output voltage of the battery 42.

The main control section 21 has a microcomputer, and has an identification code update control function 21a, a mutual authentication control function 21b, and a content reproduction control function 21c as control functions according to the present invention. are doing.

First of all, the mutual authentication control function 21b
When the memory card 10 is inserted and the reproduction operation is performed, the device identification code (device ID) registered in the device and the media identification code (media ID) registered in the memory card 10 are changed. The memory card 10 is used to perform mutual authentication control in a predetermined procedure with the memory card 10 to determine whether the memory card 10 is a playable card.

The device identification code is composed of a fixed part and a variable part as shown in FIG. In the fixed part, a device ID fixed code unique to the device is written. The area code obtained from the mobile communication network is renewably written in the variable portion. On the other hand, the media identification code is composed of only a fixed part. In this fixed portion, a medium ID code and a region code unique to the medium having a predetermined relationship with the device identification code are fixedly written.

The identification code update control function 21a accesses the base station of the mobile communication network immediately after the device is turned on and at regular intervals thereafter, and obtains the position information of the base station. The position information includes a region code indicating a country or region, and the variable portion of the device identification code shown in FIG. 5 is updated based on the region code.

The content reproduction control function 21c reads the content information from the memory card 10 when the reproduction of the memory card is approved as a result of the mutual authentication by the mutual authentication control function 21b. If the content information is audio data, the audio data is supplied to the audio codec 23 and output from the speaker 32. If the content information is image data, this image data is supplied to the LCD
Display on CD21.

Next, the operation of the information reproducing apparatus configured as described above will be described. For example, a device identification code is recorded and set in the information reproducing device at the time of shipment. This device identification code is composed of a device ID fixed code unique to each device as shown in FIG. 5 and an area code for limiting the use area, and is stored in a dynamic memory (DRAM) in the main control unit 21. Written temporarily. On the other hand, a medium identification code is recorded and set in the memory card 10 at the time of manufacturing the medium, for example. The media identification code is composed of a code unique to the media and an area code for limiting the use area of the audio data, and both are fixed.

Now, it is assumed that the user has turned on the power to use the information reproducing device. Then, the information reproducing device controls the change of the identification code. FIG. 2 is a flowchart showing the procedure and contents.

That is, the main control section 21 first executes step 2
Initial setting of each part in the circuit is performed in a. At this time, the area code input at the time of recording the audio data is set in the variable portion of the device identification code. Next, the main control unit 21 activates the wireless unit 1 in step 2b to access a mobile communication network (not shown). Then, in step 2c, position information is acquired from the base station with which synchronization has been established. The location information includes the area code of the base station, and the main control unit 21 compares the newly acquired area code with the area code of the device identification code in step 2d. As a result of this comparison, if the area code has changed, the process proceeds to step 2e to change the variable portion of the device identification code to the newly acquired area code. If the result of the above comparison shows that the area code has not changed, the previously set area code is used as it is.

While the information reproducing apparatus is in use, the main control section 21 monitors the elapse of a predetermined time in step 2f while monitoring the power-off operation in step 2g. In this state, it is assumed that a certain time has elapsed from the time when the device identification code was set. Then, the main control unit 21 returns to step 2b, accesses the mobile communication network here, and acquires position information from the base station with which synchronization has been established (step 2c). Then, the area code of the base station included in the position information is compared with the area code of the device identification code (step 2d). As a result of the comparison, if the area code has changed, it is determined that the information reproducing apparatus has moved to the area, and the variable portion of the apparatus identification code is changed to the newly acquired area code in step 2e.

For example, as shown in FIG. 6, assume that the information reproducing apparatus MS has moved from the radio service area Ei formed by the base station BSi to the radio service area Ej of the base station BSj covering another area. At this time, after moving to the wireless service area Ej, the information reproducing device MS acquires the position information from the base station BSj of the synchronization establishment destination. Then, the variable part of the device identification code is updated using the area code included in the position information.

As a result of comparing the newly acquired area code with the area code of the apparatus identification code, if the area code has not changed, the area code set as the apparatus identification code is held as it is.

Thereafter, the main control unit 21 similarly accesses the mobile communication network every time a predetermined time elapses, acquires position information from the base station to which synchronization is established, and uses the area code included in the position information. To update the variable portion of the device identification code.

When the power is turned off, the main controller 21 proceeds from step 2g to step 2h, where the variable portion of the device identification code is reset to an initial value. The reason why the variable portion of the device identification code is reset to the initial value is to prevent a so-called hacking action in which the device identification code is taken out from the outside during the power-off period and is abused. In order to reset the variable portion, the device identification code is held in a volatile memory such as a DRAM during the power-on period, and the DRAM is turned off when the power is turned off.
It is preferable that the device identification code stored in the device is erased.

Next, a case where audio data recorded on the memory card 10 is reproduced by using the above-described information reproducing apparatus will be described. In order to reproduce the audio data of the memory card 10, it is necessary to form an encrypted data communication path between the information reproducing device and the memory card 10. And to form this data communication path,
Mutual authentication control must be performed between the information reproducing device and the memory card 10 to confirm the establishment of the authentication. FIG.
Is a flowchart showing the procedure and contents of the mutual authentication control.

That is, the main controller 21 monitors the mounting of the memory card 10 in step 3a. When the user inserts the memory card 10 into the card slot of the information reproducing device in this state, the main control unit 21 first proceeds to step 3
At b, it is determined whether or not the inserted memory card 10 is to be authenticated. If it is not the object to be authenticated, it is determined that the memory card 10 cannot be used, and the memory card 10 is disconnected.

On the other hand, if it is an object to be authenticated, the flow shifts to step 3c, where a first mutual authentication process is first executed. The first mutual authentication process is an authentication process in which all bits of the device identification code and the media identification code, that is, not only the fixed code but also the area code are considered.

In the mutual authentication process, both the information reproducing apparatus and the memory card 10 execute the authentication process according to a predetermined procedure, and collate the respective authentication results to determine whether the authentication is established. FIG. 4 is a flowchart showing the procedure of the authentication process in the memory card 10 among them.

That is, in the memory card 10, one of the key blocks stored in advance is selected in step 5a, and the selected key (special value) is made to act on the media identification code (media ID). , Generate a temporary common key (step 5b). Next, in step 5c, the temporary common key is encrypted with the random value generated in step 5d, and in step 5e, the encrypted key is
The collation data is generated by encrypting using the temporary common key generated in (1).

On the other hand, in the information reproducing apparatus, step 4
The device identification code (device ID) being set is read out in step a, and a key provided from the memory card 10 is applied to the device ID to generate a temporary common key (step 4b). Then, in step 4c, collation data is generated by applying the encryption key given from the memory card 10 to the temporary common key.

The memory card 10 collates the collation data generated by itself with the collation data generated by the information reproducing device in step 5f. If the two match, it is determined that the authentication has been established. If the two do not match, it is determined that the authentication has not been established.

In the information reproducing apparatus, the authentication process is executed according to the same procedure, and the establishment / non-establishment of the authentication is mutually determined.

The information reproducing apparatus and the memory card 1
If the authentication result is obtained at 0, respectively, the main control unit 21 of the information reproducing device determines whether mutual authentication has been established at step 3d. Then, upon confirming that the mutual authentication has been established, the main control unit 21 thereafter executes the reproduction control of the memory card 10 corresponding to the area code.

On the other hand, it is assumed that mutual authentication has not been established in the first mutual authentication processing in consideration of the area code. This is mainly because the area code of the device identification code is changed by the movement of the information reproducing device, and the information reproducing device is out of the usable area of the memory card 10.

However, as described above, the memory card 10 includes a new type in which the media ID includes the area information and an existing type card which does not include the area code. When attempting to reproduce the existing type of memory card with the information reproducing device, mutual authentication is not established because the area ID is not included in the media ID of the memory card, and the recorded information cannot be reproduced.

Therefore, the main control unit 21 of the information reproducing device,
If mutual authentication is not established in the first mutual authentication process, the process proceeds to step 3e, where the second mutual authentication process is executed. In the second mutual authentication processing, mutual authentication is performed using only the fixed codes of the device identification code and the media identification code.

That is, in the memory card 10, first, only the fixed code portion of the media identification code (media ID) is separated, and a key (special value) is applied to the fixed code portion to generate a temporary common key. I do. Next, verification data is generated by encrypting the temporary common key using a random value and encrypting the encrypted key using the temporary common key.

On the other hand, also in the information reproducing apparatus, only the fixed code portion of its own apparatus identification code (device ID) being set is separated. Then, a key provided from the memory card 10 is made to act on the device ID with respect to the fixed code portion, thereby generating a temporary common key. Then, the verification data is generated by applying the encryption key provided from the memory card 10 to the temporary common key.

The memory card 10 collates the collation data generated by itself with the collation data generated by the information reproducing device. If the two match, it is determined that the authentication is established. Determines that authentication is not established.

The above-described authentication processing is performed in the same procedure in the information reproducing apparatus, and it is determined whether authentication has been established or not.

The information reproducing apparatus and the memory card 1
If an authentication result using only the fixed code portion is obtained at 0, the main control unit 21 of the information reproducing device determines whether mutual authentication has been established at step 3f. Then, upon confirming that the mutual authentication has been established, the main control unit 21 thereafter executes the reproduction control of the existing type memory card 10 without considering the area code.

If the mutual authentication fails even in the second mutual authentication process, the main controller 21 determines that the reproduction of the memory card 10 is impossible and disconnects the memory card 10.

As described above, in this embodiment, the device identification code of the information reproducing device and the media identification code of the memory card 10 are each composed of the fixed code and the region code, and the region code of the device identification code is set. The information is updated based on the position information obtained from the mobile communication network. When the mutual authentication control is performed between the information reproducing device and the memory card 10, the authentication process is performed using the device identification code including the updated area code and the media identification code.

Therefore, even if the user tries to reproduce the recorded information by bringing the memory card 10 together with the information reproducing device to another region or country, the device identification code of the information reproducing device is changed in the region code and the authentication is not established. The reproduction of the recorded information can be invalidated. That is, even when a user uses a device such as an audio player that can be carried and used together with the memory card, the reproduction of the recorded information on the memory card 10 can be restricted by region or country.

When mutual authentication is performed between the information reproducing device and the memory card 10, first, a first mutual authentication process is performed using a device identification code including a region code and a media identification code. When the authentication is not established due to the mutual authentication processing, the second mutual authentication processing is performed using only the individual code not including the area code. For this reason, even the existing type of memory card 10 that does not consider the area code can be reproduced without being unconditionally excluded.

In addition, since the device identification code and the media identification code have a configuration in which the local code is added to the individual code, when the second mutual authentication process is executed, only the individual code is easily separated to perform the authentication process. Can be used for

The present invention is not limited to the above embodiment. For example, in the embodiment, the location information is acquired from the mobile communication network, and the area code of the device identification code is updated. However, the present invention is not limited to this.
The area code may be searched and updated based on the location information and the area table stored in advance.

In the above embodiment, location information is acquired from the mobile communication network at regular time intervals to update the area code. However, the present invention is not limited to this, and the information reproducing device is provided with a so-called idle handover function for automatically switching the base station to which synchronization is established according to the movement of the terminal, such as a mobile communication terminal such as a mobile phone or a portable information terminal. . Then, movement between regions may be detected using this idle handover, and the region code of the device identification code may be updated based on the detected information. In this way, the device identification code can be updated quickly according to the movement of the device in the area.

Further, when the mutual authentication fails, the reason may be displayed, that is, a message indicating that the information reproducing apparatus is out of the usable area may be displayed. In this way, the user can clearly know the reason why the memory card cannot be reproduced.

Further, the information reproducing apparatus is provided with a function of connecting to the private communication network via the communication channel, and the variable part of the equipment identification code is changed based on the identification information of the private communication network notified from the communication network. It may be changed. In this way, the information reproducing device can be used only in the pre-registered premises, and can be made unusable when taken out of the premises. As a result, for example, it is possible to record important development information and the like that can be handled only in a research facility on a recording medium, and to make it impossible to take it out of the facility and play it back. Leakage of the used information can be reliably prevented.

Further, the information reproducing apparatus may be provided with a clock, and the variable portion of the apparatus identification code may be changed according to the time counted by the clock. In this way, the device identification code can be changed for each time zone, thereby preventing, for example, reproduction of the recording medium outside working hours.

In the above-described embodiment, an audio player having a network access function has been described as an example of the information reproducing apparatus. However, the present invention is not limited to this, and the present invention can be applied to mobile communication terminals such as mobile phones and PDAs, and in-vehicle devices used in car stereos and car navigation systems. In addition, the configuration of the information reproducing device, the type of the storage medium, the type of the mutual authentication method performed between the information reproducing device and the storage medium, the procedure and the contents thereof are variously modified without departing from the gist of the present invention. Can be implemented.

[0062]

As described above in detail, according to the present invention, a first identification code and a second identification code are registered in an information reproducing apparatus and a storage medium before use thereof, respectively.
Every time the use condition of the information reproducing device changes, at least a part of the first identification code is changed to a code corresponding to the use condition. Then, when a request to reproduce information stored in the storage medium is input in the information reproducing device,
Prior to the reproduction of the information, a mutual authentication procedure is executed between the information reproducing device and the storage medium according to a predetermined algorithm based on the changed first identification code and the second identification code. It is determined whether or not the reproduction of information is permitted according to the result of the execution of the mutual authentication procedure.

Therefore, according to the present invention, even when the use condition of the information reproducing apparatus changes, the information reproduction of the storage medium can be effectively restricted, and thereby the authentication for improving the reliability regarding the information reproduction can be achieved. A method and an information reproducing device can be provided.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing an embodiment of an information reproducing device that performs an authentication method according to the present invention.

FIG. 2 is an exemplary flowchart showing a procedure and contents of identification code change control by a main control unit of the information reproducing apparatus shown in FIG. 1;

FIG. 3 is an exemplary flowchart showing the procedure and contents of mutual authentication control by a main control unit of the information reproducing apparatus shown in FIG. 1;

FIG. 4 is a flowchart showing a procedure and contents of a mutual authentication process in the mutual authentication control shown in FIG. 3;

FIG. 5 is a view showing a format of an identification code (device ID).

FIG. 6 is an exemplary view for explaining identification code change control in the information reproducing apparatus shown in FIG. 1;

[Explanation of symbols]

 BSi, BSj: Base station of mobile communication network Ei, Ej: Wireless communication area MS: Information reproducing device 1: Wireless unit 2: Baseband unit 3: Input / output unit 4: Power supply unit 10: Memory card 11: Antenna 12: Antenna Duplexer 13 receiving circuit (RX) 14 frequency synthesizer (SYN) 15 transmitting circuit (TX) 21 main control unit 21a identification code update control function 21b mutual authentication control function 21c content reproduction control function 22 LCD Control unit 23 Audio decoder 24 Memory card interface (I / F) 25 Memory card detection unit 31 Liquid crystal display (LCD) 32 Speaker 33 Key input unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B017 AA07 BA05 CA09 CA14 5C053 FA30 HA40 JA21 KA01 KA24 LA20 5D044 DE49 GK12 HH15 5J104 AA07 AA16 EA06 EA18 KA02 NA02 NA03 NA35 NA37

Claims (12)

[Claims] 1. A storage medium for storing information,
An authentication method for performing mutual authentication between an information reproducing apparatus having a function of reading out information stored in the storage medium from the storage medium and reproducing the information, and prior to reproduction of the information, comprising: Registering a first identification code and a second identification code each composed of a fixed part and a variable part in a medium; each time the use condition of the information reproducing device changes, the first identification code Changing the variable portion of the code to a code corresponding to the changed use condition; and, when a request to reproduce the information stored in the storage medium is input in the information reproducing device, the information is reproduced prior to the reproduction of the information. Mutual authentication procedure between a playback device and a storage medium according to a predetermined algorithm based on the changed first identification code and the second identification code A process of executing the authentication method characterized by in response to the execution result of the mutual authentication procedure was and a process of determining whether or not to allow the reproduction of the information. 2. The method according to claim 1, wherein the change of the first identification code is performed based on information indicating a place of use of the information reproducing apparatus and acquiring the information indicating the place of use. The authentication method described. 3. When the information reproducing device has a function for connecting to a communication network via a communication channel, the change of the first identification code is performed by a network operation notified from the communication network. 3. The authentication method according to claim 2, wherein the authentication is performed based on identification information of a person. 4. When the information reproducing apparatus has a function for connecting to a mobile communication network via a wireless channel, the first identification code is changed from the mobile communication network to each area. 3. The authentication method according to claim 2, wherein the authentication is performed based on the transmitted area identification information. 5. The information reproducing apparatus according to claim 1, wherein the first identification code is changed for each time zone based on a clock output of the clock unit when the information reproducing device includes a clock unit. Item 1. The authentication method according to Item 1. 6. The mutual authentication procedure includes, between an information reproducing device and a storage medium, first, a fixed part and a variable part of the first identification code and a fixed part and a variable part of the second identification code. A first step of performing mutual authentication in accordance with a predetermined algorithm, and if the authentication result in the first step does not permit information reproduction, a fixed portion of the first identification code and the second step 2. The authentication method according to claim 1, further comprising a second step of performing mutual authentication according to a predetermined algorithm based on the fixed part of the identification code. 7. An information reproducing apparatus having a function of reading and reproducing information stored in a storage medium, comprising: an identification code storage unit storing an authentication first identification code including a fixed part and a variable part; Identification code changing means for changing a variable portion of the first identification code stored in the identification code storage means to a code corresponding to the changed use condition every time the use condition of the information reproducing device changes; When a request to reproduce information stored in the storage medium is input, prior to reproduction of the information, a second identification code for authentication registered in advance in the storage medium with the storage medium and Mutual authentication processing means for executing a mutual authentication procedure according to a predetermined algorithm based on the changed first identification code, and based on the authentication result by the mutual authentication processing means. Information reproducing apparatus, characterized by comprising a reproduction control means for determining whether to reproduce the information stored in the storage medium. 8. The identification code changing means has means for acquiring information indicating a place of use of the information reproducing device, and the first code changing means is based on the information indicating the place of use acquired by the means.
The information reproducing apparatus according to claim 7, wherein a variable portion of the identification code is changed. 9. When having a function for connecting to a communication network via a communication channel, said identification code changing means obtains identification information of a network operator from said communication network, and 9. The information reproducing apparatus according to claim 8, wherein a variable portion of the first identification code is changed based on identification information of a network operator. 10. When a timer is provided, the identification code changing unit changes a variable portion of the first identification code for each time zone based on a clock output of the timer. The information reproducing apparatus according to claim 8, wherein 11. An information reproducing apparatus having a function of reading and reproducing information stored in a storage medium and a function of connecting to a mobile communication network via a wireless channel, wherein the authentication includes a fixed part and a variable part. Identification code storage means for storing a first identification code for use in a mobile communication network, acquiring area identification information broadcasted for each area from a mobile communication network, and changing the first identification code stored in the identification code storage means Identification code changing means for changing a portion based on the acquired region identification information, and when a request to reproduce the information stored in the storage medium is input, prior to reproduction of the information, In accordance with a predetermined algorithm, based on a second identification code registered in advance in the storage medium and a first identification code stored in the identification code storage means, Mutual authentication processing means for executing a mutual authentication procedure, and reproduction control means for determining whether to reproduce information stored in the storage medium based on an authentication result by the mutual authentication processing means. An information reproducing device characterized by the above-mentioned. 12. The mutual authentication processing means, between the storage medium and a fixed part and a variable part of a second identification code registered in advance in the storage medium, and stored in the identification code storage means. First processing means for executing a mutual authentication procedure according to a predetermined algorithm based on the fixed part and the variable part of the first identification code, and the authentication result by the first processing means does not permit information reproduction. And a second processing unit for performing mutual authentication according to a predetermined algorithm based on the fixed part of the first identification code and the fixed part of the second identification code. The information reproducing apparatus according to claim 11, wherein