Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1984-11-09
1987-09-01
Cangialosi, Salvatore
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 25, H04L 900
Patent
active
046913556
ABSTRACT:
A security control system is provided for interactively identifying and authenticating the authorization of a user of a communications terminal, and optionally providing a means for decoding and encrypting communications signals transmitted to and from the terminal. The system utiizes a security unit that is associated with the terminal, and requires that an encryption device which has been assigned to the user be received in a port that is defined by the security unit in order that the security unit can respond properly to query signals which are sent along a communications link that couples the terminal to other communications equipment. Communications units at both ends of the communications link operate in synchronization such that each new authentication query signal that is sent from one of the units will be answered by an appropriate, newly calculated authenticating signal from the other, whereupon the unit that has sent the query signal checks the received response for correctness of calculation. A feature of the invention resides in requiring that each newly requested authenticating signal differ in a calculated manner from a previously sent authenticating signal, with the manner in which sequential authenticating signals differ being determined, at least in part, by the unique character of the user-assigned encryption device. Optional features that can be included in the encryption device include capabilities to select stored algorithms for use in encrypting, decoding and updating stored encryptions, and to effect control of system operation.
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"The 60 Second Password", by Security Dynamics, Jan. 1984.
Cytrol, Inc., "Cylock PC Access and Data Protection," 2 pages, has 1984 copyright date.
MicroFrame, Inc., "New Magnakey," 2 pages, date unknown.
Analytics Communications Systems, "Sherlock Information Security System," 6 pages, is believed to bear a date of 3/84.
Codercard, "Who's Out to Get Your Computer?," 4 pages, date unknown, but 3 of the 4 pages have 1984 printed at the top.
Codercard, "Who's Out to Get Your Computer?, " 7 pages, date unknown.
Codercard, "1984 Annual Report," 12 pages, date unknown.
Remote Systems, Inc., "Shut Down Electronic Piracy," 4 pages, date unknown.
Cork William H.
Wirstrom Peter
Burge David A.
Cangialosi Salvatore
Lewis Aaron J.
Pirmasafe, Inc.
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