JP2000286832A - Information recording system, information recording method and computer-readable recording medium storing program to allow computer to execute the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording system that can efficiently secure security of electronic data while relieving a load of a user in the case of sending/receiving the electronic data via removable media and to provide an information recording method and a recording medium. SOLUTION: In the case of writing data to a disk under the control of a processor 110, an encryption processing processor 113 encrypts a random number (encryption key) used for encrypting data by using a public key to record the result to a sub code of a head sector, and in the case of reading data, the processor 113 extracts a private key corresponding to the public key from a key list 112a, decodes the encrypted random number by using this private key to acquire the random number (encryption key) and decodes the encrypted data by using the acquired random number.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording system, an information recording method, and a recording medium comprising a portable information recording medium and an information recording apparatus for encrypting and recording desired electronic data on the information recording medium. In particular, the present invention relates to an information recording system, an information recording method, and a recording medium capable of efficiently securing confidentiality of electronic data while reducing the burden on a user when electronic data is transmitted and received via the information recording medium.

[0002]

2. Description of the Related Art With the recent development of networks such as the World Wide Web (WWW), online data communication is frequently performed. However, large-capacity electronic data is transmitted online. Then, an enormous transmission time and communication cost will be generated. Also, if you transmit electronic data that you want to keep secret online, even if you encrypt the electronic data,
It is not preferable because it gives a third party an opportunity to steal electronic data.

[0003] For these reasons, large-capacity electronic data and highly confidential electronic data are often stored in portable removable media such as floppy disks and optical disks, and are often sent and received by mail or by hand.

[0004] In addition, while enterprises are increasingly using a network such as an in-house LAN, electronic data is still exchanged via removable media in the same department.

As described above, data has been frequently exchanged via a removable medium. However, if raw electronic data is simply recorded on the removable medium, the confidentiality of the electronic data recorded on the removable medium is not considered. Cannot be secured.

Therefore, when exchanging highly confidential electronic data via such a removable medium, before recording the electronic data on the removable medium, an encryption algorithm of a public key cryptosystem or a conventional cryptosystem is used. A technique of encrypting electronic data and decrypting the electronic data extracted from the removable medium using an encryption algorithm is used.

[0007]

However, in order to encrypt or decrypt electronic data, in addition to the cumbersome operation of inputting the encryption key and encrypting or decrypting it, it is necessary to properly manage the encryption key. This causes a problem in encryption management. Originally, it is generally recognized that there is a trade-off between the confidentiality of electronic data and the operability of the user, so the higher the confidentiality, the greater the burden on the user.

For this reason, when transmitting and receiving electronic data via a removable medium, it is extremely important to secure the confidentiality of the electronic data while reducing the burden on the user.

The present invention has been made in view of the above-mentioned problem (problem), and secures the confidentiality of electronic data efficiently while reducing the burden on the user when transmitting and receiving electronic data via a removable medium. An object of the present invention is to provide an information recording system, an information recording method, and a computer-readable recording medium recording a program for causing a computer to execute the method.

[0010]

In order to achieve the above object, an information recording system according to the first aspect of the present invention comprises a portable information recording medium, and desired electronic data encrypted on the information recording medium. In an information recording system comprising an information recording device for recording, the information recording medium records at least a public key, and the information recording device records the electronic data when recording the electronic data on the information recording medium. Encrypting means for encrypting with a predetermined encryption key, encrypting the encryption key used for the encryption with a public key recorded on the information recording medium, and encrypting the encrypted electronic data from the information recording medium; When reading, decryption means for decrypting the encryption key encrypted with the public key and decrypting the encrypted electronic data read from the information recording medium with the decrypted encryption key. And it said that there were pictures.

According to the first aspect of the invention, when electronic data is recorded on the information recording medium, the electronic data is encrypted with a predetermined encryption key, and the encryption key used for the encryption is recorded on the information recording medium. Automatically encrypt with the public key recorded on the medium,
When reading the encrypted electronic data from the information recording medium, the encryption key encrypted with the public key is decrypted, and the encrypted electronic data read from the information recording medium is automatically decrypted with the decrypted encryption key. Since decryption is performed, the encryption processing and the decryption processing can be made transparent (transparent) to the user, and the confidentiality of the electronic data can be secured.

Also, in the information recording system according to the present invention, the encrypting means may include a first encrypting means for encrypting the electronic data using a predetermined encryption key, A second encryption unit for encrypting with the public key recorded on the information recording medium, the encrypted data encrypted by the first encryption unit and the encryption key encrypted by the second encryption unit; Data recording means for recording on an information recording medium, wherein the decryption means reads out the encrypted data and the encrypted encryption key recorded on the information recording medium, and the data reading means reads out the data. First decryption means for decrypting the encrypted encryption key using a secret key corresponding to the public key, and the data reading means using the encryption key decrypted by the first decryption means. Read encrypted data Characterized in that a second decoding means for decoding.

According to the second aspect of the present invention, when performing the encryption process, the electronic data is encrypted using a predetermined encryption key, and the encryption key is encrypted using a public key recorded on an information recording medium. The encrypted data and the encryption key are recorded on the information recording medium. Also, when performing the decryption process,
Reads the encrypted data and the encrypted encryption key recorded on the information recording medium, decrypts the read encrypted encryption key using a secret key corresponding to a public key, and reads using the decrypted encryption key. Since the encrypted data is decrypted, the encrypted encryption key can be exchanged via the information recording medium, and the decryption process can be performed efficiently.

Further, in the information recording system according to the present invention, the first decryption means may include a key list including a pair of the public key and a secret key corresponding to the public key; Secret key acquisition means for acquiring a secret key corresponding to the public key based on the secret key acquisition means for decrypting the encrypted encryption key read by the data reading means using the secret key obtained by the secret key acquisition means. It is characterized in that

According to the third aspect of the present invention, the secret key corresponding to the public key is obtained based on the key list including the pair of the public key and the secret key corresponding to the public key, and the encrypted encryption key is obtained. Since the key is decrypted using the obtained private key, the private key can be obtained efficiently. Also,
The information recording system according to claim 4, wherein the encrypting means further includes a random number generating means for generating a predetermined random number, and wherein the first encrypting means outputs the random number generated by the random number generating means. The electronic data is encrypted as an encryption key.

According to the fourth aspect of the present invention, a predetermined random number is generated, and the electronic data is encrypted using the generated random number as an encryption key. Therefore, the random number can be used as an initial value of an encryption algorithm. it can.

The information recording system according to a fifth aspect of the present invention is characterized in that the information recording medium records the public key in a non-rewritable storage area. According to the fifth aspect of the present invention, since the public key is recorded in the non-rewritable storage area, the encryption key can be efficiently encrypted using the public key.

According to a sixth aspect of the present invention, there is provided an information recording system comprising: a portable information recording medium; and an information recording apparatus for encrypting and recording desired electronic data on the information recording medium. In the information recording method, when the electronic data is recorded on the information recording medium, the electronic data is encrypted with a predetermined encryption key, and the encryption key used for the encryption is recorded on the information recording medium. An encryption step of encrypting with the key, and, when reading out the encrypted electronic data recorded on the information recording medium by the encryption step, decrypting the encryption key encrypted with the public key. A decryption step of decrypting the encrypted electronic data read from the information recording medium using the encrypted key thus obtained.

According to this invention, when electronic data is recorded on the information recording medium, the electronic data is encrypted with a predetermined encryption key, and the encryption key used for the encryption is recorded on the information recording medium. Automatically encrypt with the public key recorded on the medium,
When reading the encrypted electronic data from the information recording medium, the encryption key encrypted with the public key is decrypted, and the encrypted electronic data read from the information recording medium is automatically decrypted with the decrypted encryption key. Since decryption is performed, the encryption processing and the decryption processing can be made transparent (transparent) to the user, and the confidentiality of the electronic data can be secured.

Further, in the information recording method according to the present invention, the encrypting step may include a first encrypting step of encrypting the electronic data using a predetermined encryption key, and A second encryption step of encrypting with the public key recorded on the information recording medium, and the encrypted data encrypted in the first encryption step and the encryption key encrypted in the second encryption step. A data recording step of recording the data on an information recording medium, wherein the decryption step comprises: a data reading step of reading encrypted data and an encrypted encryption key recorded by the information recording medium; A first decryption step of decrypting the encrypted encryption key using a secret key corresponding to the public key, and a data reading step using the encryption key decrypted in the first decryption step. Read the encrypted data Characterized in that it includes a second decoding step of No. of.

According to the seventh aspect of the invention, when performing the encryption process, the electronic data is encrypted using a predetermined encryption key, and the encryption key is encrypted using a public key recorded on an information recording medium. The encrypted data and the encryption key are recorded on the information recording medium. Also, when performing the decryption process,
Reads the encrypted data and the encrypted encryption key recorded on the information recording medium, decrypts the read encrypted encryption key using a secret key corresponding to a public key, and reads using the decrypted encryption key. Since the encrypted data is decrypted, the encrypted encryption key can be exchanged via the information recording medium, and the decryption process can be performed efficiently.

Further, in the information recording method according to the invention of the eighth aspect, the first decryption step is characterized in that the first decryption step is performed based on a key list including a pair of the public key and a secret key corresponding to the public key. A secret key corresponding to the key is obtained, and the encrypted encryption key read in the data reading step is decrypted using the obtained secret key.

According to the eighth aspect of the present invention, a secret key corresponding to a public key is obtained based on a key list including a pair of a public key and a secret key corresponding to the public key. Since the key is decrypted using the obtained private key, the private key can be obtained efficiently.

According to a ninth aspect of the present invention, in the information recording method, the encrypting step includes generating a predetermined random number and encrypting the electronic data using the generated random number as the encryption key. .

According to the ninth aspect of the present invention, since a predetermined random number is generated and the electronic data is encrypted using the generated random number as an encryption key, the random number can be used as an initial value of an encryption algorithm. it can.

According to a tenth aspect of the present invention, there is provided a recording medium on which a program for causing a computer to execute the method according to any one of the sixth to ninth aspects is recorded. Accordingly, the operations of claims 6 to 9 can be realized by a computer.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an information recording system, an information recording method, and a computer-readable recording medium on which a program for causing a computer to execute the method according to the present invention will be described with reference to the accompanying drawings. The form will be described in detail. In this embodiment, a case is shown in which the present invention is applied to an optical disk drive embodying a re-recordable optical disk recording device.

FIG. 2 is a block diagram showing the overall configuration of the optical disk drive 100 used in the present embodiment. As shown in FIG. 1, the optical disk drive 100 includes a disk 101, a motor 102, and a rotation control system 103.
, An optical pickup 104, a coarse movement motor 105, a coarse movement motor control system 106, and a pickup control system 107
, A signal processing system 108, and a controller 109.

As shown in FIG. 3, the disk 101 has a partial ROM comprising a read-only ROM section 101a and a readable / writable RAM section 101b.
The motor 102 is a disk.
Is a driving unit that rotationally drives the motor 102. The rotation driving system 103 is a control unit that controls the motor 102.

The optical pickup 104 is a light irradiating / receiving unit that irradiates the disk 101 with laser light and receives the reflected light. The coarse movement motor 105 moves the optical pickup 104 in the radial direction of the disk 101. The coarse movement motor control system 106 is a control section that drives and controls the coarse movement motor 105.

The pickup control system 107 is a control unit for controlling the pickup by the optical pickup 104, the signal processing system 108 is a processing unit for performing signal processing of a signal received by the optical pickup, and the controller 109 is Rotation control system 103, coarse motor control system 10
6. Pickup control system 107 and signal processing system 108
Is a control unit that controls

Then, the optical disk drive 100
Then, at the time of data reproduction, a laser beam is emitted from the optical pickup 104 at the reproduction power, and data is reproduced based on the reflected light. At the time of data recording, the laser beam is emitted from the optical pickup 104 at the recording power, and the signal Record

Next, a specific configuration of the controller 109 shown in FIG. 2 will be described. FIG. 1 is a block diagram showing a specific configuration of the controller 109 shown in FIG. As shown in the figure, the controller 109 includes a processor 110, a program storage medium 111, an internal storage medium 112, a cryptographic processor 113, and a communication port 114.

The processor 110 includes a controller 109
, The rotation control system 103, the coarse motor control system 10
6. Signal processing system 108 and pickup control system 107
And a processor that controls More specifically, the processor 110 stores a program for performing data write control and data read control in the program storage medium 1.
11 to control the cryptographic processor 113 and the control systems 103, 106, 107 and 108.

The program storage medium 111 is the disk 1
01 and the disk 101
This is a memory formed by a ROM (Read Only Memory) or the like in which a program for performing data read control from the ROM is stored. The program also controls the encryption processing using the encryption processor 113.

The internal storage medium 112 has an EEPROM (Electrically Erasable and Progable) storing a key list 112a in which a pair of a secret key and a public key as shown in FIG.
This is a memory formed by a rammable ROM). In addition,
The key list 112a shown in the figure is used when the cryptographic processor 113 decrypts a random number encrypted using a public key cryptosystem encryption algorithm.

The cryptographic processor 113 stores the data in the disk 1
01 is encrypted by using a random number, and a random number itself is encrypted using a random number.
This is a processor that performs an encryption process based on a program having a public key cryptosystem encryption algorithm (including a decryption algorithm) for encrypting using the public key stored in 1a.

For example, a DES encryption (Data Encryption Standard) promulgated by the United States Department of Commerce Standard Bureau can be used as the encryption algorithm of the conventional encryption system, and an RSA encryption (Rivest- Shamir-Adleman) can be used.

Next, the contents of the data write processing by the controller 109 shown in FIG. 1 will be specifically described. FIG. 5 is a diagram showing the concept of the data writing process by the controller 109 shown in FIG. As shown in the figure, the controller 109 first encrypts the data 501 with the random number 502 using the encryption processor 113 to create encrypted data 503.

Here, the encryption algorithm for creating the encrypted data is not a public key encryption system for encrypting a random number, but an encryption algorithm for encrypting the data 501 itself.

For example, as this encryption algorithm, D
In the case of using the ES encryption, the DES encryption itself combines the substitution and transposition to stir the plaintext bit pattern based on the 56-bit key, and thus the random number can be used as the 56-bit key. . Also,
When a pseudo-random number sequence called Vernam cipher is used, such a random number can be used as an initial value of the pseudo-random number sequence.

Thereafter, the encryption key used for encrypting the data 501, that is, the random number is stored in the ROM 101a of the disk 101.
, And an encrypted random number (encrypted random number) 505 is calculated.

The sub-code 507 of the head sector 506 for recording the data of the disk 101 is added to the encrypted random number 5.
05, and one sector of the encrypted data 503 is recorded in the leading sector 506. Thereafter, the encrypted data 503 is sequentially transferred to the disk 1 for each sector in the same procedure.
Record at 01.

As described above, when data is written to the disk 101, the data 501 is not simply encrypted and written to the disk 101, but the random number (encryption key) 504 used for encrypting the data 501 is stored in the public key. The data is encrypted at 504 and recorded in the subcode 507 of the first sector 506.

Next, a data write processing procedure by the controller 109 shown in FIG. 1 will be described. FIG.
5 is a flowchart showing a data write processing procedure by the controller 109 shown in FIG. As shown in FIG.
The public key 504 stored in the OM unit 101a is read (step S601), a random number (encryption key) 502 used for encrypting the data 501 is generated (step S602), and the generated random number is encrypted with the public key to generate an encrypted random number. 505 (step S603).

Thereafter, the cryptographic processor 109
Creates encrypted data 503 by encrypting data 501 using random number (encryption key) 502 (step S6).
04), the encrypted random number 505 is stored in the subcode 507 of the head sector 506 (step S605).

Then, one sector of encrypted data is extracted from the encrypted data 503 (step S606), and a subcode is concatenated to the encrypted data to form sector data (step S607). Write (step S608). If there is any remaining encrypted data 503 (step S60)
(9 Affirmative) The process proceeds to step S606, and when the writing of all the encrypted data 503 is completed (step S609), the writing process ends.

Next, a procedure for reading data by the controller 109 shown in FIG. 1 will be described. FIG.
6 is a flowchart showing a data read processing procedure by the controller 109 shown in FIG. As shown in FIG.
The public key 504 is read from the OM unit 101a (step S701), and the key list 112a stored in the internal storage medium 112 is extracted (step S702).
The secret key corresponding to the read public key 504 is extracted from the key list 112a (step S703).

Then, the subcode 5 of the head sector 506
07, an encryption random number 505 is extracted (step S70).
4) The encrypted random number 505 is decrypted with a secret key to calculate a random number (encryption key) 502.

Thereafter, the process of extracting the encrypted data for one sector (step S706) and repeating the process of sequentially connecting the extracted encrypted data (step S707) is repeated (step S708: YES). If it is (No at Step S708), the connected encrypted data 503 is decrypted with the random number (encryption key) 502 to obtain the data 501 (Step S709).

As described above, in the present embodiment,
When writing the data 501 to the disk 101, the random number (encryption key) 504 used for encrypting the data 501
Is encrypted with the public key 504 and recorded in the subcode 507 of the first sector 506. When data is read from the disk 101, the public key 50
4, the encrypted random number is decrypted with the secret key to obtain a random number (encryption key) 502, and the encrypted data 503 is decrypted with the obtained random number 502. The processing and decryption processing can be made transparent to the user, and the confidentiality of the electronic data can be ensured.

In the above-described embodiment, the case where the present invention is applied to an optical disk drive embodying a rewritable optical disk recording apparatus has been described. However, the present invention is not limited to this. It can be applied to removable media drives.

[0053]

As described above, according to the first aspect of the present invention, when electronic data is recorded on an information recording medium, the electronic data is encrypted with a predetermined encryption key, and The used encryption key is automatically encrypted with the public key recorded on the information recording medium, and when reading the encrypted electronic data from the information recording medium, the encryption key encrypted with the public key is decrypted and decrypted. Since the encrypted electronic data read from the information recording medium is automatically decrypted with the encrypted encryption key, the encryption processing and the decryption processing can be made transparent to the user. Also, an information recording system capable of securing the confidentiality of electronic data can be obtained.

According to the second aspect of the present invention, when performing the encryption process, the electronic data is encrypted using a predetermined encryption key, and the encryption key is encrypted using a public key recorded on an information recording medium. When the encrypted data and the encryption key are recorded on the information recording medium and the decryption process is performed, the encrypted data and the encrypted encryption key recorded on the information recording medium are read, and the read encryption is performed. Decrypting the encrypted encryption key using a secret key corresponding to the public key, and decrypting the encrypted data read using the decrypted encryption key. And an information recording system capable of efficiently performing the decoding process.

According to the third aspect of the present invention, a secret key corresponding to a public key is obtained based on a key list including a pair of a public key and a secret key corresponding to the public key, and the encrypted secret key is obtained. Since the configuration is such that the encryption key is decrypted using the obtained private key, an information recording system capable of efficiently obtaining the private key is obtained.

According to the fourth aspect of the present invention, since a predetermined random number is generated, and the generated random number is used as an encryption key to encrypt electronic data, the random number can be used as an initial value of an encryption algorithm. This provides an effect that an information recording system capable of performing the above-described operations can be obtained.

According to the fifth aspect of the present invention, since the public key is recorded in the non-rewritable storage area, the information recording system can efficiently encrypt the encryption key using the public key. Is obtained.

According to the present invention, when electronic data is recorded on an information recording medium, the electronic data is encrypted with a predetermined encryption key, and the encryption key used for the encryption is stored in the information storage medium. When automatically encrypting with the public key recorded on the recording medium and reading the encrypted electronic data from the information recording medium, the encryption key encrypted with the public key is decrypted, and the information is recorded with the decrypted encryption key. Because it was configured to automatically decrypt the encrypted electronic data read from the medium,
An effect is obtained that the encryption processing and the decryption processing can be made transparent (transparent) to the user, and that an information recording method that can secure the confidentiality of the electronic data can be obtained.

According to the seventh aspect of the present invention, when performing the encryption processing, the electronic data is encrypted using a predetermined encryption key, and the encryption key is encrypted using a public key recorded on an information recording medium. When the encrypted data and the encryption key are recorded on the information recording medium and the decryption process is performed, the encrypted data and the encrypted encryption key recorded on the information recording medium are read, and the read encryption is performed. Decrypting the encrypted encryption key using a secret key corresponding to the public key, and decrypting the encrypted data read using the decrypted encryption key. And an information recording method capable of efficiently performing a decoding process.

According to the invention of claim 8, the secret key corresponding to the public key is obtained based on the key list including the pair of the public key and the secret key corresponding to the public key, and the encrypted secret key is obtained. Since the encryption key is configured to be decrypted using the obtained private key, an information recording method capable of efficiently obtaining the private key is obtained.

According to the ninth aspect of the present invention, since a predetermined random number is generated and the generated random number is used as an encryption key to encrypt electronic data, the random number is used as an initial value of an encryption algorithm. This leads to an effect that an information recording method capable of performing the above-described operation is obtained.

According to a tenth aspect of the present invention, there is provided a recording medium on which a program for causing a computer to execute the method according to any one of the sixth to ninth aspects is recorded. Accordingly, the operations of claims 6 to 9 can be realized by a computer.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a controller of an optical disk drive according to an embodiment.

FIG. 2 is a block diagram showing an overall configuration of an optical disk drive used in the present embodiment.

FIG. 3 is a block diagram illustrating a configuration of the disc illustrated in FIG. 2;

FIG. 4 is a diagram showing an example of a key list stored in an internal storage medium shown in FIG.

FIG. 5 is a diagram showing the concept of a data write process by the controller shown in FIG. 1;

FIG. 6 is a flowchart showing a data write processing procedure by the controller shown in FIG. 1;

FIG. 7 is a flowchart showing a data read processing procedure by the controller shown in FIG. 1;

[Explanation of symbols]

 Reference Signs List 100 optical disk drive 101 disk 101a ROM unit 101b RAM unit 102 motor 103 rotation control unit 104 optical pickup 105 coarse motor 106 coarse motor control system 107 pickup control system 108 signal processing system 109 controller 110 processor 111 program storage medium 112 internal storage medium 112a Key list 113 Cryptographic processor 114 Communication port 501 Data 502 Random number (encryption key) 503 Encrypted data 504 Public key 505 Encrypted random number 506 Sector 507 Subcode

Claims (10)

[Claims] 1. An information recording system comprising a portable information recording medium and an information recording device for encrypting and recording desired electronic data on the information recording medium, wherein the information recording medium records at least a public key. The information recording apparatus, when recording the electronic data on the information recording medium, encrypts the electronic data with a predetermined encryption key, and stores the encryption key used for the encryption on the information recording medium. Encrypting means for encrypting with the recorded public key, and when reading out the encrypted electronic data from the information recording medium, decrypting the encryption key encrypted with the public key and using the decrypted encryption key. An information recording system, comprising: decryption means for decrypting the encrypted electronic data read from the information recording medium. 2. The encryption device according to claim 1, wherein the encryption unit encrypts the electronic data with a predetermined encryption key, and encrypts the encryption key with a public key recorded on the information recording medium. A second encryption unit; and a data recording unit that records the encrypted data encrypted by the first encryption unit and the encryption key encrypted by the second encryption unit on the information recording medium. The decrypting means includes: data reading means for reading encrypted data and an encrypted encryption key recorded on the information recording medium; and an encrypted encryption key read by the data reading means as the public key. First decryption means for decrypting using the corresponding secret key, and second decryption means for decrypting the encrypted data read by the data reading means using the encryption key decrypted by the first decryption means. That decryption means is provided. The information recording system according to claim 1, wherein: 3. The method according to claim 1, wherein the first decryption unit includes a key list including a pair of the public key and a secret key corresponding to the public key, and a secret key corresponding to the public key based on the key list. 3. The apparatus according to claim 2, further comprising: a secret key acquiring unit for acquiring, wherein the encrypted encryption key read by the data reading unit is decrypted by using the secret key obtained by the secret key acquiring unit. Information recording system. 4. The encryption means further comprises a random number generation means for generating a predetermined random number, and the first encryption means uses the random number generated by the random number generation means as the encryption key to generate the electronic data. 4. The information recording system according to claim 2, wherein the information is encrypted. 5. The information recording system according to claim 1, wherein the information recording medium records the public key in a non-rewritable storage area. 6. An information recording method for an information recording system, comprising: a portable information recording medium; and an information recording device for encrypting and recording desired electronic data on the information recording medium. An encryption step of encrypting the electronic data with a predetermined encryption key when recording the electronic data with a predetermined encryption key and encrypting the encryption key used for the encryption with a public key recorded on the information recording medium; When reading the encrypted electronic data recorded on the information recording medium by the encryption step, the encryption key encrypted with the public key is decrypted, and the encryption key read from the information recording medium with the decrypted encryption key. A decoding step of decoding the converted electronic data. 7. The encryption step includes a first encryption step of encrypting the electronic data using a predetermined encryption key, and encrypting the encryption key with a public key recorded on the information recording medium. A second encryption step, and a data recording step of recording the encrypted data encrypted in the first encryption step and the encryption key encrypted in the second encryption step on the information recording medium. The decrypting step includes a step of reading encrypted data recorded on the information recording medium and an encrypted encryption key; and a step of setting the encrypted encryption key read in the data reading step to the public key. A first decryption step of decrypting using the corresponding secret key, and a second decryption of the encrypted data read in the data reading step using the encryption key decrypted in the first decryption step. Including the decryption step 7. The information recording method according to claim 6, wherein: 8. The first decrypting step includes: obtaining a secret key corresponding to the public key based on a key list including a pair of the public key and a secret key corresponding to the public key; 8. The method according to claim 7, wherein the encrypted encryption key read in the reading step is decrypted using the obtained secret key.
Information recording method described in. 9. The information recording method according to claim 7, wherein in the encrypting step, a predetermined random number is generated, and the generated random number is used as the encryption key to encrypt the electronic data. 10. A computer-readable recording medium on which a program for causing a computer to execute the method according to claim 6 is recorded.