Bluetooth

For Bluetooth device to pair with each other , they must first establish a 128-bit key that is used to encrypt all communication . in this way , no one can snoop on the devices and steal data , and no outside device can pose as one of the devices because outside devices don’t have the 128-bit encryption . both users of the devices that are to pair have to type in the same secret PIN , which is then used to create the 128-bit encryption key .

The Bluetooth 3.0 specification was adopted by the Bluetooth SIG on April 21st, 2009.

Bluetooth is a standard for wireless communications between devices in a personal area network (PAN) using radio frequency for a short range (around 10 meters). earlier we have many version with different range and Data-tansfer Rate .