G - Physics – 07 – B
Patent
G - Physics
07
B
354/34, 340/70
G07B 17/04 (2006.01) G07B 17/00 (2006.01)
Patent
CA 1273109
ABSTRACT A system is disclosed for securing a device from invasive and noninvasive tampering, one such device being a printer assembly for use in a value printing system, such as a postal mailing system. The system is comprised of a Decryption microcomputer operable for decrypting the input data to be printed in accordance with a valid cipher key, the encrypted data and key being provided by another device, such as a postal meter. The cipher key is stored within a Tamper Latch readably coupled to the Microcomputer for providing the key to the Microcomputer. In addition, the Tamper Latch has a wire of small cross-sectional area connected thereto such that the presence of the wire is operable for defining a portion of the cipher key. To provide further security from tampering the Microcomputer, Latch and wire are embedded within a potting material. An attempt to remove the potting material in order to gain access to the components embedded therein will cause a breakage of the wire, thereby invalidating the cipher key and rendering the Microcomputer inoperable for decrypting the data to be printed.
545866
Chickneas Arthur A.
Talmadge Paul C.
Pitney Bowes Inc.
Sim & Mcburney
LandOfFree
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