Skype is a software program created by the Swedish and Danish entrepreneurs Niklas Zennstrom and Janus Friis. Skype
allows users to make telephone calls over Internet to other Skype users free of charge, or to landlines and cell phones for a fee. Skype is a voice and text based instant messaging system, which works on the VOIP technology. You can download the skype software from its website www.skype.com, then you can talk to people who are logged into skype and also call people in different countries if you have the subscription of the skype calling card. Additional features include instant messaging, file transfer, short message service, video conferencing and its ability to circumvent firewalls. Skype is a freeware so that u can download it for free. SkypeOut allows Skype users to call traditional telephone numbers, including mobile telephones, for a fee. SkypeIn allows Skype users to receive calls on their computers dialed by regular phone subscribers to a local Skype phone number. Secure communication is a feature of Skype. The Skype
User is not involved in the
encryption process and therefore does not have to deal with the issues of public
key infrastructure. Skype reportedly uses non-proprietary, widely trusted encryption techniques: RSA for key negotiation and Advanced Encryption Standard to encrypt conversations. Skype provides an uncontrolled registration system for users: registration requires no proof of identity. This works two ways: you can use the system safely without revealing your real-life
identity to other users of the system, but on the other hand you have no guarantees that the person you communicate with is the one they say they are in real life. The downside of this is that it is easy to use the personal name (but not identity) of a trusted person as a Skype nickname and trick a naive user into revealing information or executing a program sent to them.
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