Cryptography – Cryptanalysis
Patent
1983-07-21
1987-02-03
Boudreau, Leo H.
Cryptography
Cryptanalysis
101 71, 235101, 382 57, 382 1, 400104, 283 73, 380 23, 380 51, G06H 900, H04L 900
Patent
active
046413464
ABSTRACT:
A system for the metering of encrypted postage 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 generation signals with encryption signals. The interleaving is accomplished on a row-by-row basis by inserting 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 coding 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.
REFERENCES:
patent: 3990558 (1976-11-01), Ehrat
patent: 4105997 (1978-08-01), McGinn
patent: 4253158 (1981-02-01), McFiggans
patent: 4264396 (1981-04-01), Stewart
patent: 4376299 (1983-03-01), Rivest
patent: 4422376 (1983-12-01), Teraoka
patent: 4440248 (1984-04-01), Teraoka
patent: 4447890 (1984-05-01), Duwel et al.
patent: 4468141 (1984-08-01), Rosza
Clark John I.
Eckert Alton B.
Warren David M.
Boudreau Leo H.
Mancuso Joseph
Pitchenik David E.
Pitney Bowes Inc.
Scribner Albert W.
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