PC-based voice cryptography via telephone lines

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...

Full description

Saved in:
Bibliographic Details
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
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: De La Salle University
Language: English
Description
Summary: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.

Similar Items