Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1990-04-16
1991-06-04
Buczinski, Stephen C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 51, 34082534, H04K 100, H04K 900, H04L 900
Patent
active
050220802
ABSTRACT:
Method and apparatus for determining that a first unit of data associated with a first party has not been modified since a specified point in time. A method includes the steps of (a) providing the first unit of data and (b) generating a second unit of data from the first unit of data, the second unit of data being expressive of an information content of the first unit of data. The method further includes a step of (c) generating a time indication for specifying a point in time, the time indication being generated with time generation means having a time is settable by a second party other than the first party. That is, the time generation means is secured and cannot be altered or changed by the first party. The method further includes a step of (d) encrypting the second unit of data and the generated time indication to generate a third unit of data. The method includes as an additional step a step of (e) validating the first unit of data to ensure that the first unit of data has not been modified since the specified point in time.
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Durst Robert T.
Hunter Kevin D.
Buczinski Stephen C.
Pitchenik David E.
Scolnick Melvin J.
Whisker Robert H.
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