JP2007174216A - Information processing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processing apparatus capable of adding, to an electronic document, a signature of an image close to a handwritten one by an image that differs slightly each time, without having to prepare for it, beforehand. <P>SOLUTION: The information processing apparatus creates electronic documents added with electronic images and electronic signatures. The apparatus adds a signature image 109 to an electronic document 101 for create an electronic document 110 with the signature image, and encrypts this electronic document 110 with the signature image by using a secret key 103 of its signer. The apparatus adds a certificate 102 of the signer to the encrypted electronic document 110 with the signature image, and generates signature data 115 on the electronic document with the signature image. By adding this signature data 115 on the electronic document with the signature image to the electronic document 110 with the signature image, an electronic document 116 with the signature image and an electronic signature is generated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information processing apparatus, and more particularly to an information processing apparatus that generates a signature image.

In a conventional electronic signature system, it is necessary to associate a signature image with a certificate in advance and register it in a computer (for example, see Patent Document 1).
JP 2003-005639 A

  However, in the technique disclosed in Patent Document 1, it is necessary to prepare a signature image in advance.

  An object of the present invention is to provide an information processing apparatus that can add a signature of an image close to handwriting to an electronic document with a slightly different image each time without prior preparation.

  The information processing apparatus according to the present invention uses an input unit that inputs a character image input by handwriting and additional information when the character image is input by handwriting, and a character image and additional information input by the input unit. And generating means for generating an electronic signature.

  According to the present invention, a signature of an image close to handwriting can be added to an electronic document with a slightly different image each time without preparation in advance.

  FIG. 4 is a flowchart showing an electronic image generation method according to the present invention. Each process in this flowchart is executed by the central processing unit of the information processing apparatus.

  In step 1, a pointer is set to the first character of the character string.

  In step 2, the flexible font basic data of the character pointed to by the set pointer is acquired. FIG. 3 shows the relationship between the virtual pen tip coordinates and the virtual paper surface when the flexible font is rasterized.

  In step 3, the x coordinate is offset for horizontal writing, and the y coordinate is offset for vertical writing.

  In step 4, the time is offset and added to the end of the current nib locus.

  In step 5, a pen point locus between characters with the previous character is set.

  In step 6, the pointer is advanced by one.

  In step 7, it is determined whether or not it is the end of the character string.

  In step 8, the pen tip locus is changed according to the parameters.

  In step 9, the time is set to zero.

  In step 10, the pen tip is moved to the coordinates corresponding to time t.

  In step 11, the position of the ink adhering to the paper surface is calculated from the position of the pen tip.

  In step 12, the time is advanced by Δt.

  In step 13, it is determined whether or not it is the end of time.

  The signature image is generated by the above processing (FIG. 2).

  FIG. 1 is a diagram illustrating a generation method for generating an electronic document to which an electronic image and an electronic signature are added according to the present invention. Each process in this figure is executed by the central processing unit of the information processing apparatus.

  In step 1, a document 100 to be converted into a PDF file, a signer's certificate file 102, and a signer's private key file 103 are input by the user.

  In step 2, an electronic document 101 is generated from the input document 100.

  In step 3, a hash value 104 is generated from the electronic document 101.

  In step 4, a certificate hash value 105 is generated from the signer's certificate.

  In step 5, the signer name 106 added in advance to the signer's certificate is extracted.

  In step 6, the signature image 109 is generated by the method described in FIG. 4 (FIG. 2). At this time, the hash value 104, the certificate hash value 105, and the signer name 106 are used.

  In step 7, the signature image 109 generated in step 6 is added to the electronic document 101 to generate an electronic document 110 with a signature image.

  In step 8, the signature-added electronic document 110 is encrypted using the signer's private key 103.

  In step 9, the signer's certificate 102 is added to the encrypted electronic document with signature image 110, and signature data 115 of the electronic document with signature image is generated.

  In step 10, the signature data 115 of the electronic document with the signature image is added to the electronic document 110 with the signature image, thereby generating the signature image and the electronic document 116 with the electronic signature.

  According to the present embodiment described above, a signature of an image close to handwriting can be added to an electronic document with a slightly different image each time without prior preparation.

It is a figure which shows the production | generation method which produces | generates the electronic document to which the electronic image and the electronic signature in this invention were added. It is a figure which shows the signature image produced | generated by the process of FIG. It is a figure which shows the relationship between the nib coordinate of the virtual pen at the time of rasterizing a flexible font, and a virtual paper surface. It is a flowchart which shows the electronic image generation method in this invention.

Explanation of symbols

100 Original data of electronic document 101 Electronic document before signature (PDF format)
102 Signer's certificate 103 Signer's private key 109 Signature image 115 Electronic signature of electronic document with signature image 116 Signature image and electronic document with electronic signature (PDF format document)

Claims (8)

Input means for inputting a handwritten input character image and additional information when the character image is handwritten;
An information processing apparatus comprising: generating means for generating an electronic signature using the character image and additional information input by the input means. The generating means includes
The information processing apparatus according to claim 1, wherein an electronic signature is generated by further using a hash value of the electronic certificate. The generating means includes
The information processing apparatus according to claim 1, wherein an electronic signature is generated by further using a certifier name of the electronic certificate. The generating means includes
The information processing apparatus according to claim 1, wherein an electronic signature is generated by further using a hash value of the electronic certificate. An input step for inputting a handwritten character image and additional information when the character image is handwritten,
A control method for an information processing apparatus, comprising: a generation step of generating an electronic signature using the character image and additional information input in the input step. The generation step includes
The information processing apparatus control method according to claim 5, further comprising: generating an electronic signature by further using a hash value of the electronic certificate. The generation step includes
The information processing apparatus control method according to claim 5, further comprising: generating an electronic signature by further using a certifier name of the electronic certificate. The generation step includes
The information processing apparatus control method according to claim 5, further comprising: generating an electronic signature by further using a hash value of the electronic certificate.

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