The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 04, 1993
Filed:
Sep. 09, 1991
Peter J Armbruster, Chandler, AZ (US);
Paul R Kennedy, Mesa, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A split key encryption system to crypto-seal a data file comprising a method for unique variable entry (e.g., terminal serial number), random number generation, key storage device, encryption function for combining the unique variable and the random number to generate an encryption variable in an exclusive-OR function using a variable tap linear feedback shift register, and storage function for receiving the encryption variable and the unencrypted data file. A split key decryption system to unseal the crypto-sealed data file comprises a key storage device, terminal, terminal input, and storage function, with decryption again using an exclusive-OR function using a variable tap linear feedback shift register. A comparator allows use of the unencrypted data file only if the decrypted unique variable matches the terminal serial number.