System and method for remote authorization for unlocking electro

Details System and method for remote authorization for unlocking electro System and method for remote authorization for unlocking electro

1997-12-22

1999-11-09

Swann, Tod R.

Cryptography

Cryptanalysis

380 25, H04L 900

Patent

active

059828927

ABSTRACT:
A system and method for controlling unauthorized access to software distributed to a user by a vendor in which a verification key is generated by a product key generator and either embedded in the software prior to distribution or packaged with the software as a self-installing package. The verification key includes a private signing key and a public verification key. The combination of the software and the verification key create distributable software which is distributed to a user. The user installs the software on a user computer system as protected software. To obtain a user key, the user inputs user identifying information which is sent to a user key generator. The user key generator converts the user identifying information to a numeric representation and then generates, by signing the numeric representation with the private signing key, a user key, which is returned to the user. Using the verification key, a user key verifier verifies a relationship between the user key and the user identifying information to determine an access level to the protected software. The system verifies the relationship between the user key and the user identifying information every time the software is run to ensure continued protection of the software after installation.

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