Franking machine with digital printer

Details Franking machine with digital printer Franking machine with digital printer

1992-07-07

1994-03-08

Evans, Arthur G.

Cryptography

Key management

Having particular key generator

380 51, G06F 1500

Patent

active

052934659

ABSTRACT:
A franking machine is disclosed in which a digital printing device such as a thermal printer or ink jet printer is connected to accounting circuits of the franking machine so as to be controlled thereby to print franking impressions. In order to prevent unauthorised control of the printing device by application of external print signals, print data signals output by the accounting circuit are encrypted by logically combining the signals with pseudo random strings of binary bits. At the printing device the encrypted print data signals are decrypted by logically combining the encrypted print data signals with a corresponding pseudo random string of binary bits to provide print signals to control the printing device. Connections between the decryption circuit and the print head are protected from unauthorised access.

REFERENCES:
patent: 4934846 (1990-06-01), Gilham
patent: 5121432 (1992-06-01), Gilham et al.

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