Method and arrangement for generating and checking a security im

Details Method and arrangement for generating and checking a security im Method and arrangement for generating and checking a security im

1997-07-22

1999-10-19

Barron, Jr., Gilberto

Cryptography

Electric signal modification

Having production of printed copy

380 23, 705408, H04L 902

Patent

active

059701510

ABSTRACT:
A method for checking a security imprint in a postage meter machine having a microprocessor includes the steps of encoding data for a security mark pixel image and inserts the encoded data into the remaining, fixed and variable pixel image data during printing. The method includes steps for forming a mark symbol sequence from an encoded combination number which is composed of at least a first number (sum of all postage values since the last reloading date), an optional second number added to said first number, a third number (postage value) and a fourth number (of the serial number), and for enabling a check of the security imprint by a postal authority. Manipulatons can be recognized using further data stored and/or calculated in a remote data center. An arrangement conducting a for check includes a mark reader composed of a CCD line camera, a D/A converter, a comparator and an encoder which are connected via an input/output unit to an input unit. A communication link can be established between the meter and the data center to evaluate mark data in a computerized manner.

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