Image forming apparatus, computer readable medium and medium

Abstract

The image forming apparatus includes: a random number information generation part that generates random number information; a first encryption part that encrypts the random number information generated by the random number information generation part with using a first encryption key; a second encryption key generation part that newly generates a second encryption key from the random number information generated by the random number information generation part; a second encryption part that encrypts specific information for identifying the apparatus with using the second encryption key generated by the second encryption key generation part; a code data creation part that creates code data based on encrypted random number information encrypted by the first encryption part and encrypted specific information encrypted by the second encryption part; and an image forming part that forms a code image based on the code data created by the code data creation part on a recording medium.

1 . An image forming apparatus comprising:
 a random number information generation part that generates random number information;   a first encryption part that encrypts the random number information generated by the random number information generation part with using a first encryption key;   a second encryption key generation part that newly generates a second encryption key from the random number information generated by the random number information generation part;   a second encryption part that encrypts specific information for identifying the apparatus with using the second encryption key generated by the second encryption key generation part;   a code data creation part that creates code data based on encrypted random number information encrypted by the first encryption part and encrypted specific information encrypted by the second encryption part; and   an image forming part that forms a code image based on the code data created by the code data creation part on a recording medium.   
     
     
         2 . The image forming apparatus according to  claim 1 , wherein the random number information generation part generates any one of new random number information per predetermined time and new random number information when the image forming part forms the code image on a new recording medium. 
     
     
         3 . The image forming apparatus according to  claim 1 , wherein the image forming part forms the code image on the recording medium with a color material in a color that is difficult to be recognized by human eyes. 
     
     
         4 . An image forming apparatus comprising:
 a random number information generation part that generates random number information;   a first pattern data creation part that creates pattern data from the random number information generated by the random number information generation part;   a second pattern data creation part that creates a plurality of pattern data from specific information for identifying the apparatus and rearranges the plurality of pattern data based on the random number information generated by the random number information generation part;   a code data creation part that creates code data based on the pattern data created by the first pattern data creation part and a plurality of rearranged pattern data rearranged by the second pattern data creation part; and   an image forming part that forms a code image based on the code data created by the code data creation part on a recording medium.   
     
     
         5 . The image forming apparatus according to  claim 4 , wherein the second pattern data creation part rearranges the plurality of pattern data by sequentially moving the plurality of pattern data based on the random number information. 
     
     
         6 . The image forming apparatus according to  claim 5 , wherein the second pattern data creation part determines a moving amount of the plurality of pattern data based on information on a digit in the random number information and sequentially moves the plurality of pattern data by the moving amount. 
     
     
         7 . A computer readable medium storing a program causing a computer to execute a process for creating code data, the process comprising:
 generating random number information;   encrypting the random number information with using a first encryption key read out from a memory;   generating a second encryption key from the random number information;   encrypting specific information for identifying an image forming apparatus with using the second encryption key; and   creating code data based on encrypted random number information encrypted by the first encryption key and encrypted specific information encrypted by the second encryption key.   
     
     
         8 . The computer readable medium according to  claim 7 , wherein the process of generating the random number information generates any one of new random number information per predetermined time and new random number information when an image forming part forming the code data on a recording medium forms the code data on a new recording medium. 
     
     
         9 . A computer readable medium storing a program causing a computer to execute a process for creating code data, the process comprising:
 generating random number information;   creating pattern data from the random number information as a first pattern data creation process;   creating a plurality of pattern data from specific information for identifying an image forming apparatus and rearranging the plurality of pattern data based on the random number information as a second pattern data creation process; and   creating code data based on the pattern data created in the first pattern data creation process and a plurality of rearranged pattern data rearranged in the second pattern data creation process.   
     
     
         10 . The computer readable medium according to  claim 9 , wherein the process of rearranging the plurality of pattern data in the second pattern data creation process rearranges the plurality of pattern data by sequentially moving the plurality of pattern data based on the random number information. 
     
     
         11 . The computer readable medium according to  claim 10 , wherein the process of rearranging the plurality of pattern data in the second pattern data creation process determines a moving amount of the plurality of pattern data based on information on a digit in the random number information and sequentially moves the plurality of pattern data by the moving amount. 
     
     
         12 . A medium on which an image is printed by an image forming apparatus comprising:
 a certain image that is printed upon a print instruction; and   a code image that is created from specific information for identifying the image forming apparatus and is printed with a color material in a color that is difficult to be recognized by human eyes,   the code image being created from encrypted random number information acquired by encrypting random number information generated in the image forming apparatus with using a first encryption key, and encrypted specific information acquired by encrypting the specific information with using a second encryption key newly generated from the random number information.   
     
     
         13 . A medium on which an image is printed by an image forming apparatus comprising:
 a certain image that is printed upon a print instruction; and   a code image that is created from specific information for identifying the image forming apparatus and is printed with a color material in a color that is difficult to be recognized by human eyes,   the code image being created from pattern data created from random number information generated in the image forming apparatus and a plurality of rearranged pattern data created from the specific information and rearranged based on the random number information.