Software defined radio

RTL-SDR receives Bluetooth LE

  Sniffing and Decoding NRF24L01+ and Bluetooth LE Packets For Under $30 article points to an interesting hack: able to decode NRF24L01+ and Bluetooth Low Energy protocols using RTL-SDR (=a cheap USB digital TV tuner based digital radio). So cheap practicality anyone can obtain the equipment quickly. Some special hacking was needed because there are

GSM is insecure

Whatever assurances have been given about the security of GSM cellphone calls, forget about them now. Breaking GSM With a $15 Phone … Plus Smarts article tells that a pair of researchers demonstrated a start-to-finish means of eavesdropping on encrypted GSM cellphone calls and text messages, using only four sub-$15 telephones as network “sniffers,” a