G - Physics – 07 – B
Patent
G - Physics
07
B
354/34, 101/96.0
G07B 17/02 (2006.01) G06K 9/18 (2006.01)
Patent
CA 1240055
FOR: SYSTEM FOR THE PRINTING & READING OF ENCRYPTED MESSAGES ABSTRACT OF THE DISCLOSURE A system for the metering of encrypted post- age and similar indicia includes a device for printing such indicia and a device for reading such indicia. The printing is accomplished with a dot matrix printer driven by signals obtained by altering character gen- eration signals with encryption signals. The inter- leaving is accomplished on a row-by-row basis by in- serting delays from an encryption circuit into signals from a character generator circuit. The reading is accomplished by correlating received characters against a stored array of symbols to determine the presence of a symbol, the extraction of coded data from character data of the received and identified character, and the comparison of the separated coded data with a reference code to determine the accuracy of the printed material. Thereby, forgery and alteration is inhibited. The cod- ing is accomplished with the dot matrix format of the characters by displacing some of the dots slightly from the remainder so as to retain the general form of the character for recognition of the character while the displaced dots serve as the code for the encryption.
512960
Pitney Bowes Inc.
Sim & Mcburney
LandOfFree
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