Whenever you are having a conversation with your friend or a business conversation with your business partner, there is a chance of hijackers to copy your conversation.here is a tool which encrypts the conversation before it is send and is decrypted at the receiving end.this software is provided by bitdefender and is completely free of cost.for more details and to download bitdefender chat encryption tool click the following link...

http://www.bitdefender.com/PRODUCT-2236-en--BitDefender-Chat-Encryption.html
Just follow the steps in the download page...