A method for printing a scanner readable code on a secure object

摘要

The present invention concerns a method for printing a scanner readable code on a secure object, for example a passport. The secure object comprises a chip and a photograph of it's owner is printed on the secure object. According to the invention, the method comprises the steps of:
i - generating a private key and a public key;
ii - extracting low-level information from the photograph;
iii - transforming this low-level information by executing a second pre-image resistant function;
iv - signing the result of the transformation with the private key;
v - transforming each block of data of the signed result in a corresponding color;
vi - printing the colors on the secure object for obtaining the scanner readable code.