Turvaline andmeedastus üle mobiilside häälekanali

Date

2015

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

Tänapäeval on mobiilside üks levinumaid viise informatsioonivahetuseks peale silmitsi suhtlemise ja interneti. Kuigi mobiilside standardid tagavad kõnede turvalisust, on neis ka teadaolevaid turvaauke. Kindlates olukordades võib kurjategija mobiilikõnet pealt kuulata või pääseda juurde mobiilioperaatori poolt salvestatud kõnedele. Mõned turvalise mobiilikõne lahendused kasutavad andmeedastuseks internetti. Teised pakkuvad spetsiaalseid telefone, mis loovad omavahel turvalist häälekanalit. Esimene variant ei sobi inimestele, kellel pole ligipääsu mobiilsele internetile, teine variant on aga kallis ning seda ei saa kasutada teiste telefonidega. Selles töös me kirjeldame lahendust, mis tagab turvalisuse enne kui informatsioon jõuab telefonisse. Tundlikud andmed töödeldakse eraldiseisvas seadmes ning saadetakse telefonisse analoogse helisignaalina. Sellist seadet saab ühendada igal telefoniga, millel on ette nähtud heli sisend. Töö käigus me vaatlesime erinevaid olemasolevaid lahendusi, seadistasime süsteemi parameetreid ja viisime läbi katsed. Tulemusena me saavutasime süsteemi, mis edastab turvaliselt andmed kiirusega kuni 2000 biti sekundis ja veamäära mediaaniga 21 protsenti. Võtmesõnad: Andmeedastus, häälekanal, mobiilside, modulatsioon, krüpteerimine.
Nowadays mobile communication is one of the most common forms of exchanging information. Although mobile communication standards were designed with security in mind, a few known vulnerabilities exist. An attacker can penetrate a mobile network and eavesdrop on a victim's conversation or access data servers of the operator where conversation recordings are stored. A number of attempts has been done to address the issue of mobile communication security. Software solutions use a mobile data channel with standard security mechanisms for information exchange. Hardware solutions represent custom phones that create secure voice channel between two such devices. The first solution does not suite users, who do not have access to the mobile data channel. The disadvantage of the second solution is a high cost and an incompatibility with general phones. In this work, we describe an alternative solution, where security is enforced before any information reaches the phone. Sensitive information such as voice is processed in an external device and then passed into the mobile phone as an analog sound signal. The advantage of this approach is that the external unit and can be attached to any phone with a sound input. While building the system, we analyzed a number of existing solutions, tuned parameters and performed experiments. As a result, we came up with a system that performs secure data transfer at a speed of up to 2000 bps and a median error rate of 21 percent. Keywords: Data transmission, voice channel, mobile communication, modulation, encryption.

Description

Keywords

Citation