The paper presents and compares steganographic techniques that can be used to enable hidden communication within computer networks. A new class – “steganophony” – of such methods is introduced. Specific methods proposed by the authors – LACK, HICCUPS and SIP-based VoIP protocols’ steganography – are briefly described.

Spam over Internet Telephony is becoming a large problem of the Voice over IP Architectures. Voice over IP has become a valid alternative to the Public Switched Telephone Network and it has a new paradigm for providing telephony services at a lower cost and higher flexibility. In the meantime, with Voice over IP the privacy becomes so hard and the benefits introduced are as strong as the securi...

With a strong push from commercial ventures like Microsoft Xbox r © [23] and Sony Playstation r © [15], the multiplayer networked gaming industry continues to grow steadily. Multiplayer games have become an important element of entertainment in the networked age of today, due to their nature of allowing geographically dispersed players to participate in a single game. In order to provide intera...

With a strong push from commercial ventures like Microsoft Xbox and Sony Playstation , the multiplayer networked gaming industry continues to grow steadily. Multiplayer games allow geographically dispersed players to participate in a single game and in order to provide interaction amongst players in such environments, text messaging and real-time voice through VoIP is used. However, such intera...

Voice over Internet Protocols (VoIP) is an IP-based communication technology or commonly known as (IP). In which, IP currently widely used for mobile activities. However, the main concern in application of VoIP system ability to maintain information confidentiality while guaranteeing protection its primary users. For this reason, it requires do addition Virtual Private Network (VPN) features. C...

In this paper, we evaluate available steganographic techniques for SIP (Session Initiation Protocol) that can be used for creating covert channels during signaling phase of VoIP (Voice over IP) call. Apart from characterizing existing steganographic methods we provide new insights by introducing new techniques. We also estimate amount of data that can be transferred in signalling messages for t...

The simple, efficient Session Initial Protocol (SIP) is widely used to integrate context-awareness computing techniques. We propose a SIP-based research framework that integrates automatic speech generation to make communication between users more convenient. Based on the proposed approach, we built and tested a SIP context server and several SIP agents hosted on PCs. If the called party is abs...

Current techniques for the formal modeling analysis of DoS attacks do not adequately deal with amplification attacks that may target a complex distributed system as a whole rather than a specific server. Such threats have emerged for important applications such as the VoIP Session Initiation Protocol (SIP). We demonstrate a modelchecking technique for finding amplification threats using a strat...

Session Initiation Protocol seems to be the preferred standard for Voice over IP. In this paper, we consider the limitations of existing SIP conferencing methods and propose a distributed architecture using Controllers (SIP Proxy Servers) and Conference Servers which facilitates the control and media handling of a VoIP conference. The Conference Servers are designed on the basis of H.323’s Mult...

The Session Initiation Protocol (SIP) is the multimedia communication protocol of the future. Used for Voice-over-IP (VoIP), Internet Multimedia Subsystem (IMS) and Internet Protocol Television (IPTV), its concepts are based on mature and open standards and its use is increasing rapidly within recent years. However, with its acceptance as a mainstream communication platform, security concerns b...