Newsletter #75: Stealth Wifi Channels

Hello Recompilers,

All of Issue 9 is online! This issue focuses on Hard Problems. Articles cover mesh networks, floating point algorithms, leveling up as a developer, and more.


Telcos are selling realtime data about anyone’s cell phone location to, well, anyone. Of course, this breaks their ostensible privacy policies, so they’re doing it through a string of subcontractors, trickling down through the bail bond industry. But you can hire a private investigator to track anyone’s phone.
(Joseph Cox for Motherboard)

Facial recognition software (still) has a major race problem. In yet another example of how bias infiltrates AI systems, a facial recognition program was shown to rate black faces as angrier than white faces.
(Josiah J. Downing for The Conversation)

Underclocking a wifi chip can create a stealth wifi channel. Hacker CNLohr decided to underclock an ESP8266 and it ended up creating a wifi channel only another chip running at the same clock speed can communicate with.
(Tom Nardi for Hackaday)


Loose Leaf Security: Security Stories
In this episode, Liz and Geoffrey look at security stories in the news, from facial recognition at concerts to how surveillance databases facilitate identity theft.

Conference Talk of the Week:

This talk is part of our “Favorite Talks” YouTube Playlist. Check it out and subscribe! 

Building IMU-based Gesture Recognition

Jennifer Wang at Hackaday Supercon talks about how to use IMUs and machine learning to detect gestures, which she did in order to make a Harry Potter wand that detects what spell is being cast.

Upcoming Events:

All conferences have been screened and abide by clear and strict Codes of Conduct.

CopyleftConf 2019
February 4, Brussels, Belgium

February 7-9, 2019, Miami, Florida

RubyConf Australia 2019
February 7-9, 2019, Melbourne, Australia

PyTenneesee 2019
February 9-10, 2019, Nashville, Tennessee

February 16-17, 2019, Santo Domingo, Dominican Republic

Ruby on Ice 2019
February 22-24, 2019, Tegernsee, Germany

February 23-24, 2019, Seattle, WA

ConFoo Montreal
March 13-15, 2019, Montreal, Canada

DevOpsDays Seattle
April 23-24, 2019, Seattle, WA

April 26, 2019, Omaha, Nebraska

Pycon 2019
May 1-9, 2019, Cleveland, OH

Do you know an upcoming conference or CFP that should be included? Email leads to

This newsletter compiled by Margaret Killjoy (@magpiekilljoy). Margaret is an author, activist, and musician based in Appalachia. Her most recent book series is the Danielle Cain novella series, which starts with The Lamb Will Slaughter the Lion.

Image credit: Les Pounder (CC BY-SA 2.0)