JP2006130895A - Composite visual effect cryptographic printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means which can be inserted in a notebook as a printed matter and conceal valuable information such as password, even in case it happens to be seen by some other person, and can easily allow its bearer peruse the information, whenever he wants to. <P>SOLUTION: In this composite visual effect cryptographic printer, two or more dummy characters are superposed over each other in addition to characters to be coded, and the lattice-like pattern of a decoding sheet is formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a visual composite code that can recognize a sign that is not visually meaningful printed on paper as a meaningful sentence by looking through a decryption pattern printed on a transparent sheet.

With the spread of the Internet, it is normal to have multiple passwords for accessing specific information.
However, there is a fact that the means for managing this password has become quiet.

  The present invention provides a means by which information such as an important password is not known even if it is sandwiched in a notebook as a printed matter and touched by another person, and can be easily viewed when the person wants to know it. This is the issue.

In order to solve the above problems, three fonts are prepared: a character to be encrypted (1), a dummy character 1 (2), and a dummy character 2 (3).
For the character (1) to be encrypted, an image of the encryption result (7) of the character to be encrypted is obtained by AND operation processing for extracting only the black part of the encryption mask pattern (4) of the character to be encrypted.
The dummy character 1 (2) is ANDed with the encryption mask pattern (5) of the dummy character 1 to obtain an image of the encryption result (8) of the dummy character 1.
The dummy character 2 (3) is ANDed with the encryption mask pattern (6) of the dummy character 2 to obtain an image of the encryption result (9) of the dummy character 2.
The encrypted print image (10) is obtained by OR operation processing for writing out all black portions of the encrypted result (7) of the character to be encrypted, the encrypted result (8) of the dummy character 1, and the encrypted result (9) of the dummy character 2. On the document.
The white and black portions of the encryption mask pattern (4) of the character to be encrypted are reversed, and the decryption pattern (11) is printed on the transparent sheet.
The decrypted image (12) is obtained by superimposing the decrypted pattern (11) printed on the transparent sheet on the encrypted print image (10) printed on the document.

The invention according to claim 2 is the encryption mask pattern (4) of the character to be encrypted according to claim 1, the encryption mask pattern (5) of the dummy character 1, and the encryption mask pattern of the dummy character 2 (6) is subjected to coordinate conversion processing.
By setting an appropriate numerical value to the rotation coordinate conversion function (13), a rotated mask pattern (15) is obtained.
By setting an appropriate numerical value in the helical coordinate conversion function (14), a mask pattern (16) deformed in a spiral is obtained.

According to the first aspect of the present invention, a document on which the encrypted print image (10) is printed is sandwiched between notebooks or the like.
When it is desired to know information such as a password, a transparent sheet on which the decryption pattern (11) is printed may be superimposed on a document on which the encrypted print image (10) is printed.
The lattice pattern has good visibility because it tends not to get in the way of the illusion of the human brain, and it is practical as a cipher because two or more dummy characters are superimposed regardless of its simple pattern. It can be given a strong strength.
In order to further enhance the degree of encryption, it is also possible to change the width of the lattice or change the appearance order of the lattice of the mask pattern.

  According to the second aspect of the present invention, the encryption degree can be strengthened by performing the coordinate conversion process on the mask pattern.

Realized as a personal computer application.
First, when information to be kept secret such as a password is input, dummy characters are automatically generated at random, and the encrypted print image (10) is printed on the document.
The decryption pattern (11) is convenient to carry if it is printed on a transparent material such as an OHP sheet and is made a size such as a business card.
Then, the encrypted print image (10) printed on the document can be sandwiched in a notebook or the like, and the decryption pattern (11) printed on the transparent sheet can be carried in a card or wallet. It is safe to prevent two things from crossing at the same time.

    It is a schematic diagram which shows the encryption method of this invention.     It is a schematic diagram which shows the decoding method of this invention.     This is a source program for coordinate transformation processing.     It is a figure which shows the mask pattern which performed the coordinate transformation process.

Explanation of symbols

1 Character to be encrypted 2 Dummy character 1
3 Dummy character 2
4 Encryption mask pattern of character to be encrypted 5 Encryption mask pattern of dummy character 1 6 Encryption mask pattern of dummy character 2 7 Encryption result of character to be encrypted 8 Encryption result of dummy character 1 9 Dummy character Encryption result of 2 10 Encryption print image 11 Decryption pattern 12 Decryption image 13 Rotating coordinate transformation function 14 Spiral coordinate transformation function 15 Rotated mask pattern 16 Spiral deformed mask pattern

Claims (2)

In addition to the characters to be encrypted, two or more dummy characters are overlapped to form a decryption sheet pattern in a lattice pattern. The visual composite type encryption printing machine according to claim 1, wherein the pattern of the decryption sheet is subjected to coordinate conversion processing such as rotation and spiral.

Images