The employment of sophisticated know-how is widely raising today. Imagine the belief that in the past only text letters were utilized to correspond with those you love in foreign countries. However today, considering the invention of different phones, communication is made less complicated in any part of the planet. Anywhere you wish to make a telephone or wherever you are, at any time you may make a phone just as if they’re sitting close to you. This type of enhancement in telecommunication has made it easier for lots of people, whether to house wives, to business man or even for the ordinary men and women world wide. For most people, it is very important to talk with their loved ones when they’re offshore and also this was made achievable through the aid of pre paid calling cards. All these cards are very easily loaded with credit which can be used to place international or national telephone calls. More…

VoIP is a solid technology available since some years that allows people to communicate via voice using the IP protocol instead of telephone lines.

Unfortunately this technology has been relegated in a niche market due to several factors such as proprietary standards, high price tag, limited integration with existing telephony environments. However in the last couple of years the situation changed dramatically since some open source tools such as asterisk [asterisk] as well as low-cost VoIP telephone adapters and services become available. In fact, today it is quite common for internet providers to provide their customers VoIP calls at very low cost, if any, in addition to standard xDSL connectivity. More…

We present the new watermarking scheme which guarantees the even time adjustment for embedding the watermark in real time and has all the theoretical strengths of work. Unlike the watermarking scheme proposed in previous work [32], our new watermarking scheme is probabilistic in the sense that the watermark embedding success rate is not guaranteed 100%.

In other words, the new watermarking scheme trades o® the guaranteed 100% watermark embedding success rate with the guaranteed even time adjustment for embedding the watermark. By exploiting the inherent inter-packet timing characteristics of the VoIP °ows, our new watermarking scheme achieves virtually 100% watermark embedding success rate with guaranteed even time adjustment for embedding the watermark.

Source: Chief Information Officers of the States