Valtteri Lehtinen
Security Research & Curiosities | Helsinki, Finland
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2026
Mar 3
Harjus v4 adds kernel bypass and more
2025
Jul 21
Harjus: Triangular Arbitrage Bot for Binance
2024
Mar 3
How to Make Nmap Recognize New Services
Jan 6
InmateBridge: Voice Bridge for Prank Calling
2023
Jun 5
Ripping Off Professional Criminals by Fermenting Onions
2022
May 30
UPnProxyChain: a Tool to Exploit Devices Vulnerable to UPnProxy
Feb 15
GoIP-1 GSM gateway could be harnessed for phone fraud by hackers
Jan 13
DNS records of 1% .fi domains exposed through Zone Transfers
2021
Jun 23
I made 56874 calls to explore the telephone network. Here's what I found
Apr 17
What I learned of the VOIP hacker scene by setting up a SIP Honeypot
