Apparatus and method for securing communication information...

Cryptography – Communication system using cryptography – Time segment interchange

Reexamination Certificate

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Details

C380S236000, C380S283000, C380S257000, C380S270000, C704S270100, C370S479000, C713S171000

Reexamination Certificate

active

06990198

ABSTRACT:
An apparatus and a method for securing a communication information in a CDMA communication system are disclosed. The method of the invention comprises the steps of encoding a input analog signal as an information bit having a predetermined size and generating a vocoder packet information bit, and encrypting said encoded vocoder packet information bit using a block cipher and a security key, and adding a frame quality indicator and the encoder tail bits to the encrypted vocoder packet information bit and configuring it as a CDMA frame, and transmitting the CDMA frame which passes a convolutional encoder, interleaver, and modulator in sequence, to a base station through an assigned frequency band.Further, The method of the invention comprises the steps of receiving a signal from a base station, and reproducing it as a CDMA frame, and extracting an encrypted vocoder packet information bit from the reproduced CDMA frame, and decrypting the encrypted vocoder packet information bit by a block cipher and a security key, and decoding the decrypted vocoder packet information bit.

REFERENCES:
patent: 5659569 (1997-08-01), Padovani et al.
patent: 6266418 (2001-07-01), Carter et al.
patent: 6571212 (2003-05-01), Dent
patent: 2001/0038695 (2001-11-01), Kim
Leonard Schiff and A. Chockalingam, Signal design and system operation of Globalstar versus IS-95 CDMA, vol. 6, Issue 1 (Feb. 2000) pp. 47-57; Year of publication: 2000; ISSN: 1022-0038.

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