JP2007318699A - Encryption transmission system, transmitter, receiver, transmission method, receiving method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit transmission data by enciphering information with a public key generated by a public key formation portion. <P>SOLUTION: A transmitter 101 receives a two-dimensional bar code in a two-dimensional bar code receptionist portion 102, and generates a public key from the two-dimensional bar code with a public key formation portion 103. The transmitter 101 enciphers transmission data in an encryption portion 104 with the public key formed by the public key formation portion 103, and transmits them as enciphered data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an encryption transmission system suitable for encrypting and decrypting information, a transmission device, a reception device, a transmission method, a reception method, and a program for realizing these on a computer.

Conventional technology

  Conventionally, in the field of cryptographic technology, various technologies have been proposed to prevent information leakage. For example, a technology that encrypts information leakage prevention data in a shared file server using a hybrid encryption method that allows only a specific person to decrypt information using public key cryptography and common key cryptography. is there.

  In addition, there is a so-called electronic settlement system that manages decision information for encryption / decryption operations on the client side in a server / client system.

  However, it is needless to say that new techniques are always required for preventing information leakage. Further, when transmitting highly confidential data of a business trip destination such as a digital camera image taken by a mobile phone at a business trip destination, it is desirable that the data is encrypted.

  By the way, among the known technologies, in the case of different types of transmission / reception devices such as a transmission device such as a mobile phone and a reception device realized by a PC or the like, it is difficult to share a secret key and perform encrypted communication. .

  The present invention solves the above-described problems, and is an encrypted transmission system, a transmission device, a reception device, a transmission method, a reception method, and a method suitable for encrypting and transmitting information. The purpose is to provide a program realized by

  In order to achieve the above object, the following invention is disclosed in accordance with the principle of the present invention.

  An encrypted transmission system according to a first aspect of the present invention includes a transmission device and a reception device, and is configured as follows.

  That is, the transmission device includes a two-dimensional barcode reception unit, a public key generation unit, and an encryption unit.

  Here, the two-dimensional barcode accepting unit accepts the two-dimensional barcode to the transmission device.

  The public key generation unit generates a public key necessary for encryption by converting the two-dimensional barcode received by the two-dimensional barcode reception unit into one-to-one.

  Meanwhile, the encryption unit encrypts transmission data with the public key generated by the public key generation unit.

  The receiving device includes a two-dimensional barcode generation unit and a decoding unit.

  Here, the two-dimensional barcode generation unit generates a two-dimensional barcode by one-to-one conversion from the public key paired with the reception private key.

  The decryption unit decrypts the received data with the reception private key.

  In the encrypted transmission system of the present invention, the two-dimensional barcode acquired by the transmission device is equal to the two-dimensional barcode generated by the two-dimensional barcode generation unit of the reception device. It can be.

  A transmission device according to another aspect of the present invention is a transmission device in the encrypted transmission system.

  A receiving apparatus according to another aspect of the present invention is a receiving apparatus in the encrypted transmission system.

  A transmission method according to another aspect of the present invention is a method executed in the transmission device.

  A receiving method according to another aspect of the present invention is a method executed in the above receiving apparatus.

  A program according to another aspect of the present invention causes a computer to function as the above-described transmission device or reception device, and causes the computer to execute the above-described transmission method or reception method.

  The program can be recorded on a computer-readable information recording medium (including a compact disk, flexible disk, hard disk, magneto-optical disk, digital video disk, magnetic tape, or semiconductor memory).

  The information recording medium can be distributed and sold independently of the computer, and the program itself can be distributed and sold via a computer communication network such as the Internet.

  According to the present invention, it is possible to provide an encrypted transmission system, a transmission device, a reception device, a transmission method, a reception method, and a program for realizing these on a computer, which are suitable for encrypting and transmitting information. it can.

  Embodiments of the present invention will be described below. The embodiments described below are for illustrative purposes and do not limit the scope of the present invention. Accordingly, those skilled in the art can employ embodiments in which each or all of these elements are replaced with equivalent ones, and these embodiments are also included in the scope of the present invention. .

  FIG. 1 is an explanatory diagram showing a schematic configuration of an embodiment of a transmission device of an encrypted transmission system of the present invention. Hereinafter, a description will be given with reference to FIG.

  As shown in the figure, the transmission apparatus 101 receives a two-dimensional barcode by the two-dimensional barcode reception unit 102, and uses the public key generation unit 103 from the two-dimensional barcode received by the two-dimensional barcode reception unit 102. Generate a public key. The transmission data is encrypted by the encryption unit 104 using the public key generated by the public key generation unit 103 and transmitted as encrypted data.

  For example, the transmission apparatus 101 can accept a two-dimensional barcode by regarding the two-dimensional barcode as a public key that is paired with the public key of the reception apparatus and the public key of the transmission apparatus. The public key generated by the public key generation unit 103 by performing one-to-one conversion from the two-dimensional barcode is a two-dimensional barcode generated by the receiving device and the two-dimensional barcode received by the transmitting device. , Encryption communication can be performed without distributing the secret key according to the principle of public key cryptography.

  In addition, since the public key is a public key, it is possible to print and distribute a two-dimensional barcode corresponding to the public key on paper such as a business card. It is possible to carry out the delivery of the public key that did not exist by a primitive and intuitive method such as exchange of business cards.

  In addition, when the transmission data is encrypted by the encryption unit 104, the original data can be completely erased on the memory. In this case, safety is enhanced in that unnecessary data is eliminated from the viewpoint of information protection.

  FIG. 2 is an explanatory diagram showing a schematic configuration of an embodiment of the receiving apparatus of the encrypted transmission system of the present invention. Hereinafter, a description will be given with reference to FIG.

As shown in the figure, the receiving apparatus 201 is composed of a two-dimensional barcode generation unit 202 and a decryption unit 203, and the two-dimensional barcode generation unit 202 has a one-to-one relationship from a public key corresponding to a reception private key. A two-dimensional barcode is generated and output by conversion, and the decryption unit 203 decrypts the received data with the reception private key.

  In this case, the reception private key can be generated using a unique number of the transmission apparatus 101 registered in advance in the reception apparatus 102. For example, when the transmission device is a mobile phone terminal, the terminal number of the mobile phone terminal can be used as a unique number.

    Further, the reception private key can be made different every time the receiving apparatus is activated. In this case, the two-dimensional barcode generated by the two-dimensional barcode generation unit 202 becomes different each time, and the security of key management is increased.

  When the transmission device 101 is a mobile phone terminal with a camera, there are models that can read a two-dimensional bar code. A two-dimensional bar code printed on a paper medium or the like can be read with a camera on the mobile phone terminal, and a public key Can be obtained. In this case, the transmission data captured by the camera of the mobile phone terminal is directly encrypted on the memory buffer of the mobile phone, so that the raw photo data is not stored and is completely lost.

  As described above, according to the present invention, an encrypted transmission system, a transmission device, a reception device, a transmission method, a reception method suitable for encrypting and transmitting information, and these are realized on a computer. A program can be provided and applied to the field of cryptographic communication.

  It is a schematic diagram which shows schematic structure of the transmitter of the encryption transmission system which concerns on embodiment of this invention.   It is a schematic diagram which shows schematic structure of the receiver of an encryption transmission system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Transmission apparatus 102 Two-dimensional barcode reception part 103 Public key generation part 104 Encryption part 201 Reception apparatus 202 Two-dimensional barcode generation part 203 Decryption part

Claims (14)

An encryption transmission system comprising a transmission device and a reception device,
(A) The transmission device includes:
A two-dimensional barcode receiving unit for acquiring a two-dimensional barcode, a public key generating unit for generating a public key from the acquired two-dimensional barcode,
An encryption unit for encrypting transmission data from the public key generated by the public key generation unit;
(B) The receiving device
A two-dimensional barcode generation unit that generates a two-dimensional barcode from a public key that is paired with a reception private key;
An object comprising a decryption unit for decrypting received data from the reception private key. The cryptographic transmission system according to claim 1,
The two-dimensional barcode acquired by the transmitter is equal to the two-dimensional barcode generated by the two-dimensional barcode generator of the receiver. The cryptographic transmission system according to claim 1,
The reception private key used for decryption in the reception device is:
It is generated using a unique number of the transmitting device registered in advance in the receiving device in the previous period. The cryptographic transmission system according to claim 1,
The reception private key used for decryption in the reception device is:
What is different every time the receiving device is activated. The cryptographic transmission system according to claim 1,
The transmission device encrypts the transmission data and then deletes the transmission data from the memory.   The transmission apparatus in the encryption transmission system of any one of Claim 1 to 5.   The receiving apparatus in the encryption transmission system of any one of Claim 1 to 5. A transmission method executed by a transmission device communicating with a reception device,
A two-dimensional barcode receiving process for obtaining a two-dimensional barcode;
A public key generation step of generating a public key corresponding to the acquired two-dimensional barcode,
An encryption step of encrypting transmission data with the public key. The transmission method according to claim 8, comprising:
In the encryption step, after the transmission data is encrypted, the transmission data is erased from the memory. The transmission method according to claim 8, comprising:
In the transmission step, the transmission in the transmission step is performed by uploading the encrypted data to a server device accessible by a third party. A receiving method executed by a receiving device communicating with a transmitting device,
A method comprising: a two-dimensional barcode generation step for generating a two-dimensional barcode from a public key paired with a reception private key; and a decryption step for decoding received data using the reception private key. The receiving method according to claim 11, comprising:
The receiving step includes receiving data in the receiving step by downloading the transmission side encrypted data uploaded to the server device.   A program causing a computer to function as the transmission device according to claim 6.   A program causing a computer to function as the receiving device according to claim 7.

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