Skype is a popular VoIP software used worldwide, which provides free calling between computer to computer; however calling between computer to phone or phone to computer calls are not free as the customer has to pay through debit based user card for later services. Skype comes with softphone application software which is installed in the computer, which is why many VoIP users think that Skype is the only online software provider, neglecting other services behind.
Skype software combines Instant Messaging and integrated voice communication into one software where user can switch between the two; that is talk when one wants to talk and chat when one wants to chat.
How to use Skype:
It is very simple to install and use Skype software on the computer as Skype software is available for download on internet which is compatible for Windows and Mac Operating Systems. Apart from computer, internet connection, Skype software and headphone or microphone to talk; no other devices are required to communicate thorough Skype software. Skype software is similar to Instant Messaging service which has added software features and good voice quality and stability.
Features of Skype:
There are more than 340 million registered users of Skype worldwide since it has interesting features such as:
• Video conferencing
• SMS
• Voice mail
• Call forwarding
• Presence information
• Contact list
• Public chats
• Desktop shearing
• Sketch pad
• Business control panel
Protocols used in Skype:
Just like KaZaA, Skype uses peer to peer technology of voice and chat communication. SkypeIn and SkypeOut are the paid services for calling phone to computer and computer to phone respectively. Skype has introduced API (application programming interface), which provides programmers a scope to network and manage calls through programming.
Encryption is done through RC4 protocol and voice encryption is done through AES, which is a standard adapted by US Government. Skype’s coding is available in closed source format with non standardized protocol and some open source programs such as Internet Directory. Some security and networking companies claim to control these protocols for carrier and enterprise applications.
Security in Skype:
Skype uses AES 256 bit security encryption method which is transparent to all callers. Security is managed through:
• Unique username
• Password or other authentication method
• Before the session is established, each caller must present identity proof and privileges
• Encrypting messages from caller to caller