Publications (3)0 Total impact
Conference Proceeding: Real time data transmission over GSM voice channel for secure voice and data applications[show abstract] [hide abstract]
ABSTRACT: This paper describes a real time prototype implementation of a system, which enables secure voice and data communication over the GSM voice channel. The security of GSM is not guaranteed especially over the core network. The proposed system modulates digital data, which may be encrypted onto speech-like waveforms. The modulated waveform is then transmitted over the GSM voice channel, which can be demodulated and decrypted at the receiver. The real time prototype system has been tested on GSM-to-GSM voice calls, and a proprietary speech codec is used on the real time data channel to produce communication quality speech. A demonstration will be provided at the presentation.Secure Mobile Communications Forum: Exploring the Technical Challenges in Secure GSM and WLAN, 2004. The 2nd IEE (Ref. No. 2004/10660); 10/2004
Conference Proceeding: A 2.4/1.2 kbps SB-LPC based speech coder: the Turkish NATO STANAG candidate[show abstract] [hide abstract]
ABSTRACT: NATO military communications require high quality voice communications for their military missions. Currently the performance of in-place voice coding algorithms is unacceptable in the harsh tactical acoustic conditions where NATO commanders operate, such as tracked vehicles or helicopters. A new generation of 2.4/1.2 kbps speech coding algorithms has been developed which far exceed the quality of service of the existing speech coding algorithms currently used by NATO. This has led to a decision by NATO to standardize a new algorithm to suit its need, through a competition. A candidate coder based on the split-band LPC (SB-LPC) principle has been developed to fit the requirements of the competition, and has been entered by Turkey in the NATO STANAG competition. Its details are presented in this paper.Speech Coding, 2002, IEEE Workshop Proceedings.; 11/2002
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ABSTRACT: GSM is the most wide spread mobile communications sys-tem in the world. However the security of the GSM voice traffic is not guaranteed especially over the core network. It is highly desirable to have end-to-end secure communica-tions over the GSM voice channel. In order to achieve end-to-end security, speech must be encrypted before it enters the GSM network. A modulation scheme that enables the transmission of encrypted voice and data over the GSM voice channel was designed 1 . A real-time prototype is im-plemented demonstrating the end-to-end secure voice com-munications over the GSM voice channel. The modem technology presented facilitates the transmis-sion of encrypted data and an encryption algorithm is not specified. The users may choose an algorithm and a hard-ware platform as necessary.