Real time data transmission over GSM voice channel for secure voice &amp; data applications

Katugampala, N.N.; Al-Naimi, K.; Villette, S.; Kondoz, A.M.

doi:10.1049/ic.2004.0663

Cited by 28 publications

(8 citation statements)

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“…The strongest of these algorithms is A5/1 which was developed and applied in the United States and Europe; while the weakest algorithm is A5/2 which is used in other countries. A ciphertext-only attack is able to break A5/2, in addition, the rainbow table attack could crack A5/1 [11].…”

Section: Gsm Voice Call Securitymentioning

confidence: 99%

Implementation of an Encryption Scheme for Voice Calls

Bakry¹,

Deen²,

Tengy³

2016

IJCA

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Voice calls is a popular way of communication between persons. Making voice call is cheap, fast and simple. Because of mobile networks attack or smartphones hackers, telephone conversations are vulnerable. This paper presents an encryption scheme for Voice Calls. It helps the user to encrypt the voice call before transmitting it on the mobile network. The idea of the proposed system is to encrypt voice calls without using any secure servers or any intermediate systems between mobile phone and the GSM network. The encryption process occurs before reaching to mobile phone. To maintain intensive security, an encryption algorithm based on RSA encryption is used. Moreover, it uses a public key known by all users and a private key which is a secret and restricted key to each user.

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Section: Gsm Voice Call Securitymentioning

confidence: 99%

Implementation of an Encryption Scheme for Voice Calls

Bakry¹,

Deen²,

Tengy³

2016

IJCA

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“…Using voice channels for data communication is an existing concept, e.g., [16][17][18][19][20]. These works primarily focus on how to improve the communication performance while compatibly working with the voice codec in GSM systems.…”

Section: Related Workmentioning

confidence: 99%

Data broadcasting using mobile FM radio

Rahmati

Sani

et al. 2011

Proceedings of the 13th International Conference on Ubiquitous Computing

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In this work, we offer a novel system, MicroStation (µStation) that allows ubiquitous data broadcasting applications using the FM radio on mobile devices such as smartphones. µStation includes two key modules to enable data broadcasting based on existing mobile FM radio hardware. Channel Selector assigns different FM channels to neighboring µStation broadcasters to avoid collision and guides µStation listeners to find their broadcasting of interest. Data Codec realizes bit-level communication between mobile devices through existing FM radio hardware. We describe an implementation of µStation on the Nokia N900 smartphone, and provide low-level APIs and services to support application development. We also demonstrate two representative applications: Facebook-FM and Sync-Flash. These applications demonstrate the capability of µStation to readily enable a new class of ubiquitous data broadcasting applications on mobile devices.

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“…The Global System for Mobile (GSM) technologies is mainly used for voice communications in many countries, even for military purposes. However, while they ensure confidentiality for the radio access channel, its security is not guaranteed when speech is transmitted across the switch network using standard modulation such as pulse-code modulation (PCM) and adaptive differential pulse-code modulation (ADPCM) forms [1]. To ensure the end-to-end confidentiality, the speech signals are encrypted before entering the communication systems.…”

Section: Introductionmentioning

confidence: 99%

Speech Enhancement for Secure Communication Using Coupled Spectral Subtraction and Wiener Filter

et al. 2019

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The encryption process for secure voice communication may degrade the speech quality when it is applied to the speech signals before encoding them through a conventional communication system such as GSM or radio trunking. This is because the encryption process usually includes a randomization of the speech signals, and hence, when the speech is decrypted, it may perceptibly be distorted, so satisfactory speech quality for communication is not achieved. To deal with this, we could apply a speech enhancement method to improve the quality of decrypted speech. However, many speech enhancement methods work by assuming noise is present all the time, so the voice activity detector (VAD) is applied to detect the non-speech period to update the noise estimate. Unfortunately, this assumption is not valid for the decrypted speech. Since the encryption process is applied only when speech is detected, distortions from the secure communication system are characteristically different. They exist when speech is present. Therefore, a noise estimator that is able to update noise even when speech is present is needed. However, most noise estimator techniques only adapt to slow changes of noise to avoid over-estimation of noise, making them unsuitable for this task. In this paper, we propose a speech enhancement technique to improve the quality of speech from secure communication. We use a combination of the Wiener filter and spectral subtraction for the noise estimator, so our method is better at tracking fast changes of noise without over-estimating them. Our experimental results on various communication channels indicate that our method is better than other popular noise estimators and speech enhancement methods.

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Real time data transmission over GSM voice channel for secure voice & data applications

Cited by 28 publications

References 0 publications

Implementation of an Encryption Scheme for Voice Calls

Implementation of an Encryption Scheme for Voice Calls

Data broadcasting using mobile FM radio

Speech Enhancement for Secure Communication Using Coupled Spectral Subtraction and Wiener Filter

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