wiretap c tone
wiretaps, just say no
An article in Wired inspired me to make the the C-tone Matt Blaze talks about. Playing this sound during a phone call is said to disrupt many phone taps used by law enforcement agencies. (Before you get all excited I’m sure this won’t fool our friends at No Such Agency.)
The sound is the DTMF C tone at 852 Hz and 1633 Hz. Imagine that Alice downloads this sound to her cell phone and uses it like an MP3 player when calling Bob on a pay phone in a dark alley late at night.
The WAV and MP3 files are 1 minute long. WAV files have better sound quality compared to MP3.
For more details read this summary. Here’s Matt’s original paper (PDF).
Do you think someone’s listening in on you? Afraid your convesations are being monitored? Is there someone eavesdropping? Try using white noise to hide your conversations.
As long as you’re at it, you might as well put the Cap'n Crunch whistle and DTMF sounds on your phone too. Makes a nice phone security toolkit, right on your mobile phone, iPod, or other dee-vice.