Bluetooth is a “a standard for the short-range wireless interconnection of mobile phones, computers, and other electronic devices”. It operates between 2.4 and 2.485 GHz and uses very little power to create a connection between two devices.
Range varies between the version of the Bluetooth that is being used, material, antenna config, and battery condition.
Bluetooth 1.0 and 1.0B was the first release of Bluetooth but it was very buggy and products would often fail to work with each other.
Bluetooth 1.1 made some improvements by fixing various bugs and adding a signal strength indicator (RSSI).
Bluetooth 1.2 had major upgrades in speeds, faster connection and discovery, and AFH for avoiding crowded frequencies.
Bluetooth 2.0 + EDR was released in 2004 and introduced the Enhanced Data Rate standard for speedy data transfer.
Bluetooth 2.1 + EDR built upon faster pairing experiences and stronger security while improving power consumption/device filtering.
Bluetooth 3.0 + HS this standard is a large leap and allows for 24 Mbit/s over an 802.11 link after a bluetooth connection was established.
Bluetooth 4.0 + LE otherwise known as Bluetooth Smart includes Classic Bluetooth, Bluetooth high speed, Bluetooth low energy.
Bluetooth 4.1 is a software update to 4.0 that adds many new things such as…
- Mobile Wireless Service Coexistence Signaling
- Train Nudging and Generalized Interlaced Scanning
- Low Duty Cycle Directed Advertising
- L2CAP Connection Oriented and Dedicated Channels with Credit Based Flow Control
- Dual Mode and Topology
- LE Link Layer Topology
- 802.11n PAL
- Audio Architecture Updates for Wide Band Speech
- Fast Data Advertising Interval
- Limited Discovery Time
Bluetooth 4.2 introduces minor upgrades in security and support for new standards needed for IOT (internet of things).
Bluetooth 5 will focus on doubling speed, increasing range and improvements across the board to modernize the technology.
Here is a video you can watch to learn about Bluetooth 5, the future of the standard. https://www.youtube.com/watch?v=0n1x-wxESaM.
Bluetooth in relation to cybersecurity is very important because so many devices use it, meaning it needs to be strongly encrypted and not have big vulnerabilities. I suggest you read about Bluetooth and how secure it is to better inform yourselves.