An image forming apparatus has a micropattern reading unit, an encoded image generating unit and a code printing control unit. The micropattern reading unit reads a micropattern of a sheet. The encoded image generating unit generates an encoded image. The encoded image has the micropattern and a private key of a user. The code printing control unit prints the encoded image on the sheet to produce a certificate sheet.

 
Web www.patentalert.com

< Method and apparatus for using an external security device to secure data in a database

> Personalized markup for protecting numerical audiovisual streams

> System and methods for quantum key distribution over WDM links

~ 00571