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. 24, 1988
Filed:
Oct. 21, 1986
James L Taaffe, Arlington, MA (US);
Other;
Abstract
Encrypted digital information in a data processing system is decrypted using a key which is a word sequence. The key is generated in a hardware module which is a single chip microprocessor. Individual words of the key word sequence generated by the module are generated as a function of a plurality of words of the input key word sequence. To that end, the microprocessor is programmed as a finite state machine. The hardware module may be combined with a storage medium in a software package. The decryption routines and a key sequence to be applied to the key generator are stored with the application software on the storage medium. To decrypt the application software, the stored key sequence is applied to the key generator to obtain an output key sequence. A computer system may include an encryption/decryption module and a key generator module to encrypt software and data prior to outputting the software or data from the system. Identical key generators may be utilized for encryption and decryption in a secure network.