Secure communication of information

Details Secure communication of information Secure communication of information

1994-12-29

1996-11-19

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

342357, 342358, 364449, 364459, 364452, H04K 100, H09B 7185, G01C 2100

Patent

active

055771220

ABSTRACT:
Methods for secure communication of location and other information by two spaced apart receivers in a location determination (LD) system, such as GPS, GLONASS and LORAN-C, that use pseudorange corrections to enhance the accuracy of the computed present location of an LD receiver. A pseudorange correction signal PRC(t;i;j), presenting a correction of a pseudorange measurement made at time t at an LD receiver number i from an LD signal issued by an LD signal source number j, is transmitted at a consecutive sequence of times t=t.sub.0, t.sub.1, t.sub.2, . . . , t.sub.n. The pseudorange correction signal PRC(t.sub.n ;i;j), or a message sent in a time interval t.sub.n-1 <t.ltoreq.t.sub.n, is encrypted, using an encryption key that is a function of and depends non-trivially upon one or more of the preceding pseudorange correction values PRC(t.sub.k ;i;j) (k.ltoreq.n-1). This encryption key varies from one time interval t.sub.n-1 <t.ltoreq.t.sub.n, to another as the collection of preceding pseudorange correction values changes. Several suitable encryption algorithms that depend upon one or more of the preceding pseudorange correction values are discussed.

REFERENCES:
patent: 5323322 (1994-06-01), Mueller et al.
patent: 5451964 (1995-09-01), Babu
patent: 5495257 (1996-02-01), Loomis

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