YouTube Phreaking: How to Extract a Phone Number from a YouTube Clip

How to Extract a Phone Number from a YouTube Clip

Every key on a telephone keypad has its own sonic signature, a sort of calling card composed of two distinct tones: one high, one low. While it's easy to tell the difference between the individual pitches in a single row—see, for example, this article on using your cell phone as a musical instrument—, it's often difficult to differentiate between notes within the same column. Unless, of course, you outsource the work to a computer! Which is what Uruguayan hacker [Charlie X-Ray] recently set out to do. 

With a little help from Python and Audacity, Charlie came up with a method of extracting phone numbers from video clips featuring audible key presses. The results output to a neat, easy-to-read spectrogram. Moral of the story? Don't let the camera hear you dial if you want to keep a number private! 

YouTube Phreaking: How to Extract a Phone Number from a YouTube Clip

Interested in trying it out yourself? You'll find complete details on Charlie's website (Google translation).

It’s Black Friday week in the Gadget Hacks shop! Huge sales on Bluetooth speakers, phone mounts, online courses, and more. The biggest discounts are on online classes, and we’ve hand-picked our 10 favorites for you. Check them out!

See the 10 best BF deals for online courses (up to 99% off) >

Photo by sydneya

Our Best Phone Hacks

Delivered daily to your inbox.

Be the First to Comment

Share Your Thoughts

  • Hot
  • Latest