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

1997-02-11

1999-09-14

Gregory, Bernarr E.

Cryptography

Electric signal modification

Having production of printed copy

705401, 705405, 380 9, 380 21, 380 23, 380 25, 380 49, 380 55, H04L 900, H04L 906, G07B 1702

Patent

active

059534265

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. Manipulations 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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