Secure communication by encryption/decryption of vector at PSK m

Details Secure communication by encryption/decryption of vector at PSK m Secure communication by encryption/decryption of vector at PSK m

1995-12-26

1998-11-17

Barron, Jr., Gilberto

Cryptography

Key management

Having particular key generator

380 12, 380 46, 380 48, 375280, 375308, 375331, H04L 2718

Patent

active

058387978

ABSTRACT:
At the transmit end of a secure communication system, an input data symbol is mapped to a corresponding vector in a two-dimensional phase plane. The vector is pseudorandomly phase-rotated in a first direction according to a unique pseudorandom number and quadrature-modulated on a carrier for transmission. At the receive end, a quadrature detector quasi-synchronously quadrature-detects the transmitted carrier with a local carrier to recover a vector, which is pseudorandomly phase-rotated according to a pseudorandom number identical to the unique pseudorandom number in a second direction opposite to the first direction. A quadrature demodulator detects a phase error of the local carrier with respect to the received carrier and provides quadrature-demodulation on the oppositely phase-rotated vector using the detected phase error.

REFERENCES:
patent: 3748385 (1973-07-01), Okano
patent: 4652838 (1987-03-01), Nossen
patent: 4924516 (1990-05-01), Bremer et al.

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