Digital authentication over acoustic channel

Details Digital authentication over acoustic channel Digital authentication over acoustic channel

2004-02-23

2009-02-03

Parthasarathy, Pramila (Department: 2136)

Electrical computers and digital processing systems: support

System access control based on user identification by...

Using record or token

C713S182000, C713S184000

Reexamination Certificate

active

07487362

ABSTRACT:
Apparatus and method are disclosed for digital authentication and verification. In one embodiment, authentication involves storing a cryptographic key and a look up table (LUT), generating an access code using the cryptographic key; generating multiple parallel BPSK symbols based upon the access code; converting the BPSK symbols into multiple tones encoded with the access code using the LUT; and outputting the multiple tones encoded with the access code for authentication. In another embodiment, verification involves receiving multiple tones encoded with an access code; generating multiple parallel BPSK symbols from the multiple tones; converting the BPSK symbols into an encoded interleaved bit stream of the access code; de-interleaving the encoded interleaved bit stream; and recovering the access code from the encoded de-interleaved bit stream.

REFERENCES:
patent: 5481611 (1996-01-01), Owens et al.
patent: 6188717 (2001-02-01), Kaiser et al.

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