PC-based voice cryptography via telephone lines

The main objective of this study was to design a PC-based voice encryption/decryption system using telephone lines.To accomplish this objective, a CODEC COMBO CHIP IC with an 8-bit resolution and a sampling rate of 8 kHz was used at the transmitting end to sample the analog voice data coming from th...

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Main Author:	Alarcon, Cirilo
Format:	text
Language:	English
Published:	Animo Repository 1995
Subjects:	Analog-to-digital converters Data transmission systems Voice Telephone lines Cryptography Computer software Electronic digital computers > Programming
Online Access:	https://animorepository.dlsu.edu.ph/etd_bachelors/1251
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Institution:	De La Salle University
Language:	English

id	oai:animorepository.dlsu.edu.ph:etd_bachelors-2251
record_format	eprints
spelling	oai:animorepository.dlsu.edu.ph:etd_bachelors-22512021-06-15T04:53:49Z PC-based voice cryptography via telephone lines Alarcon, Cirilo The main objective of this study was to design a PC-based voice encryption/decryption system using telephone lines.To accomplish this objective, a CODEC COMBO CHIP IC with an 8-bit resolution and a sampling rate of 8 kHz was used at the transmitting end to sample the analog voice data coming from the telephone handset. It sends its output into the IBM PC through port no. 300H. The encryption software designed employs bit transposition and substitution sequences, and is used in conjunction with Telix communications software. The software outputs the encrypted data to COM1, which is connected to a modem with a minimum speed of 2400 bps and has built-in MNP error detection and correction. At the transmitting end, the process is reversed to return the encrypted message to its original form.Although the two PCs can communicate at half-duplex mode, the encryption/decryption system's operation is one-way, i.e. Point A (Transmit) contains only an encryption module and Point B (Receive contains only a decryption module. 1995-01-01T08:00:00Z text https://animorepository.dlsu.edu.ph/etd_bachelors/1251 Bachelor's Theses English Animo Repository Analog-to-digital converters Data transmission systems Voice Telephone lines Cryptography Computer software Electronic digital computers--Programming
institution	De La Salle University
building	De La Salle University Library
continent	Asia
country	Philippines Philippines
content_provider	De La Salle University Library
collection	DLSU Institutional Repository
language	English
topic	Analog-to-digital converters Data transmission systems Voice Telephone lines Cryptography Computer software Electronic digital computers--Programming
spellingShingle	Analog-to-digital converters Data transmission systems Voice Telephone lines Cryptography Computer software Electronic digital computers--Programming Alarcon, Cirilo PC-based voice cryptography via telephone lines
description	The main objective of this study was to design a PC-based voice encryption/decryption system using telephone lines.To accomplish this objective, a CODEC COMBO CHIP IC with an 8-bit resolution and a sampling rate of 8 kHz was used at the transmitting end to sample the analog voice data coming from the telephone handset. It sends its output into the IBM PC through port no. 300H. The encryption software designed employs bit transposition and substitution sequences, and is used in conjunction with Telix communications software. The software outputs the encrypted data to COM1, which is connected to a modem with a minimum speed of 2400 bps and has built-in MNP error detection and correction. At the transmitting end, the process is reversed to return the encrypted message to its original form.Although the two PCs can communicate at half-duplex mode, the encryption/decryption system's operation is one-way, i.e. Point A (Transmit) contains only an encryption module and Point B (Receive contains only a decryption module.
format	text
author	Alarcon, Cirilo
author_facet	Alarcon, Cirilo
author_sort	Alarcon, Cirilo
title	PC-based voice cryptography via telephone lines
title_short	PC-based voice cryptography via telephone lines
title_full	PC-based voice cryptography via telephone lines
title_fullStr	PC-based voice cryptography via telephone lines
title_full_unstemmed	PC-based voice cryptography via telephone lines
title_sort	pc-based voice cryptography via telephone lines
publisher	Animo Repository
publishDate	1995
url	https://animorepository.dlsu.edu.ph/etd_bachelors/1251
_version_	1772834657603158016

PC-based voice cryptography via telephone lines

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