Method and device for protecting software delivered to a user by

Details Method and device for protecting software delivered to a user by Method and device for protecting software delivered to a user by

1986-02-05

1987-07-28

Shaw, Gareth D.

Cryptography

Cryptanalysis

235382, 235376, 364900, 380 25, H04L 900

Patent

active

046835539

ABSTRACT:
The invention relates to a method and a device for protecting software delivered to a user by a supplier. The method amounts to rendering the programs non-executable in the state in which they have been delivered to the users. With each program (P.sub.i) there is associated a validation key defined via a main validation key (V.sub.i) delivered by the supplier and recorded in a storage area (M) of the user's machine (1), and via a supplementary key (V'.sub.i) computed on the lever of a card (C) issued to the user via a secret code (S) and via arguments (b.sub.i) that identify each program (P.sub.i) and are recorded in a storage area (M1) of the card (C).

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IBM Technical Disclosure Bulletin, "Protection of Memories on a Word Basis", J. Evans et al.

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