Cryptography – Communication system using cryptography – Time segment interchange
Patent
1985-05-02
1989-05-02
Cangialosi, Salvatore
Cryptography
Communication system using cryptography
Time segment interchange
380 28, 380 42, H04K 104
Patent
active
048275131
ABSTRACT:
A communications scrambler operates on a digital basis in which digital or digitized incoming and outgoing signals are merged (60) into a single bit stream for application to a binary bit store (12) and retrieval therefrom for separation (62) of those signals. Multi-bit segments of each signal represent unintelligibly fragments of those signals and are stored and read-out under control of store addressing counters (36, 38, 76) whose outputs are selectively modified (48, 50) to achieve time-dispersion encryption/decryption for outgoing/incoming signals in multi-plexed writing and reading of the store (12). Digitization (52, 54) and reconstitution (64, 66) of analogue incoming and outgoing signals is provided using inherently digital on-chip circuitry and one-bit per sample at a high rate for easy interfacing in telephone/radio systems. The whole control system can be put onto a simple semiconductor chip of ULA type.
REFERENCES:
patent: 4221931 (1980-09-01), Seiler
patent: 4433211 (1984-02-01), McCalmont et al.
Advanced Electronic Products Limited
Cangialosi Salvatore
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