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:
Jan. 02, 1996
Filed:
Feb. 28, 1994
Timothy J Doiron, Forest, VA (US);
Steven T Dreon, Forest, VA (US);
Mark D Priest, Rustburg, VA (US);
Ericsson Inc., Lynchburg, VA (US);
Abstract
A digital radio has standardized 'key' storage for several different cryptosystems (DES, VGE, VGS, etc.). Cryptographic keys are stored in a table in non-volatile memory such as EEPROM. The 'keys' are stored in an 'encrypted' form such that their identities are not readily revealed by a 'dump' of memory contents. Additional security is provided in accordance with the present invention by extracting the 'keys' from the stored table and re-'encrypting' the entire table each time a key loader device is attached to the radio. Multiple key banks are used to provide enhanced voice security by increasing the number of encryption keys available for use by a radio.