Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1995-03-07
1996-09-03
Gregory, Bernarr E.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 4, 380 23, 380 49, 380 50, 34082531, 34082534, H04L 900, H04L 932
Patent
active
055531440
ABSTRACT:
A method and system are disclosed for selectively altering the functional characteristics of a data processing system without physical or mechanical manipulation. A data processing system is first manufactured having a predetermined set of functional characteristics. A multibit alterable code which includes a functional characteristic definition is then initially loaded into physically secure, nonvolatile memory within the data processing system, utilizing an existing bus, or a fusible link which may be opened after loading is complete. The functional characteristic definition is loaded from nonvolatile memory into a nonscannable register within a secure portion of a control logic circuit each time power is applied to the data processing system and the definition is then utilized to enable only selected functional characteristics. Alternate functional characteristics may thereafter be selectively enabled by entering a security code which matches one of a number of preloaded codes and an encoded alternate functional characteristic definition. The alternate functional characteristic definition may be enabled on a one-time, metered, or regularly scheduled basis and variable capability data processing systems may be implemented in this manner utilizing a single manufactured system, without the necessity of manufacturing and storing multiple data processing system models.
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Almquist Frank A.
Anderson David F.
Campbell John E.
Chan Michael J.
Flaherty Stephen W.
Augspurger Lynn L.
Gregory Bernarr E.
International Business Machines - Corporation
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