System for decrypting encrypted software

Details System for decrypting encrypted software System for decrypting encrypted software

1995-08-01

1999-02-23

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 21, 380 23, 380 25, 380 44, 380 46, 380 49, 380 50, H04L 900

Patent

active

058752471

ABSTRACT:
A CD-ROM stores encrypted software. When a user desires to decrypt and install this software, an approval preparatory key is generated by an installer. This approval preparatory key is generated based on time data. When the user informs a center of this approval preparatory key, the center calculates a difference between this approval preparatory key and a decrypting key and vends this calculated result to a user in the form of an approval key. When the user inputs this approval key to an installer, the installer generates a decrypting key by adding the approval preparatory key to the approval key. The installer decrypts the software by this decrypting key and installs the encrypted software into a personal computer system.

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