Ossi Herrala – Medium

Ossi Herrala

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SensorFu

Bidirectional escape testing

Bidirectional or two-way escape testing verifies that escape from an isolated network can communicate both ways: from isolated environment…

Oct 12, 2023

Bidirectional escape testing

Oct 12, 2023

Revenge of the Whitefish

Last spring (2022–04–10) I was activating WWFF reference in a small municipality in Finland called Siikajoki. That day I only got 22 QSOs…

Oct 20, 2022

Revenge of the Whitefish

Oct 20, 2022

WWFF Ninja Activation in Hiastinlahti

Ninja Activation: Go to site, seen by nobody, have QSOs. Then leave no trace behind and vanish. Nobody knew about your activation before…

Apr 13, 2022

WWFF Ninja Activation in Hiastinlahti

Apr 13, 2022

Sunday WWFF activation

Today’s ham radio WWFF activation headed to a small municipality in Finland called Siikajoki with a population of 5024 people and…

Apr 13, 2022

Sunday WWFF activation

Apr 13, 2022

Overnight ham radio activation in Hailuoto, Finland

Our operation was in Hailuoto, a small island (200.53 km²) in the Gulf of Bothnia with a population less than thousand people. This is my…

Nov 10, 2021

Overnight ham radio activation in Hailuoto, Finland

Nov 10, 2021

Ham radio activation in Hailuoto, Finland

Our operation was in Hailuoto, a small island (200.53 km²) in the Gulf of Bothnia with a population less than thousand people. This is my…

May 10, 2021

Ham radio activation in Hailuoto, Finland

May 10, 2021

Published in
SensorFu

Internet Protocol Next Header escape

In IPv6 header it’s called “Next Header” and in IPv4 header it’s just “Protocol”. This eight bit value contains information about what…

Jan 26, 2021

Internet Protocol Next Header escape

Jan 26, 2021

Published in
SensorFu

How we turned 5G into 5k

Hacking is a good way of learning and hackathons are a great place to learn with other like minded people. And that was exactly what we…

Dec 9, 2019

How we turned 5G into 5k

Dec 9, 2019

110 m/s towards a planet!

This is a short story about a survival scenario I played in the game Space Engineers by Keen Software House. I got inspiration to play…

Jan 4, 2019

110 m/s towards a planet!

Jan 4, 2019

Published in
SensorFu

Using static typing to protect against code injection attacks

Code injection attack is a method of taking advantage of a flaw where an application can be tricked to relay malicious code from a system…

Jan 16, 2018

Using static typing to protect against code injection attacks

Jan 16, 2018

Ossi Herrala

Ossi Herrala

Co-founder and R&D lead of @sensorfu. Interested about free software, network security, and ham radio (callsign OH8HUB).

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