Top all-time · #11755
Valtteri Lehtinen
Personal blog · shufflingbytes.com · on HN as ValtteriLsecuritysystems
Valtteri Lehtinen's personal blog at shufflingbytes.com covers security and systems. Since 2021, 6 different Hacker News readers have linked it 14 times, most often “Ripping Off Professional Criminals by Fermenting Onions”. It is still writing: the last post was on 2026-03-03, and you can follow it by feed.
Too few sampled comments (3) to say how often HN recommends it.?
Why HN links it
HN readers link this blog for technical write-ups on phone networks and security, such as a project making 50k calls to map the telephone network and a VOIP/SIP honeypot post.
Summarised by Claude from a sample of 3 HN comments that link here. Each comment is marked recommending, critical or neutral (citing without judging); how this works.
Security Research & Curiosities
Most-linked posts?
- Ripping Off Professional Criminals by Fermenting Onions2 people · 2 mentions · first linked 2023-06-06
- What I learned of the VoIP hacker scene by setting up a SIP Honeypot2 people · 2 mentions · first linked 2021-04-18
What Hacker News says?
Unrelated to the post, but the thumbnail that loads at the top of this page is very large (and slow to load). https://shufflingbytes.com/images/avatar.png
Comment linking /images/avatar.png
on “I made 50k calls to explore the telephone network”Submitted I made 50k calls to explore the telephone network as a story · 333 points
HN discussionThe author also posted an interesting bit on setting up a VOIP/SIP honeypot: https://shufflingbytes.com/posts/sip-honeypot/ Turns out is a ton of automated activity looking to make money via poorly secured phone systems.
Comment linking /posts/sip-honeypot/
on “I made 50k calls to explore the telephone network”Submitted GoIP-1 GSM gateway could be harnessed for phone fraud by hackers as a story · 43 points
HN discussionhttps://shufflingbytes.com I write about security research and curiosities whenever I have the time and inspiration.
Comment linking /
on “Ask HN: Could you share your personal blog here?”Submitted Ripping Off Professional Criminals by Fermenting Onions as a story · 38 points
HN discussionthis is done by some darknet sites running tor hidden services on generated onion domains, for similar reasons: https://shufflingbytes.com/posts/ripping-off-professional-cr...
Comment linking /posts/ripping-off-professional-criminals-by-fermenting-onions-phishing-darknet-users-for-bitcoins/
on “Domain Matching 2FA”Submitted What I learned of the VoIP hacker scene by setting up a SIP Honeypot as a story · 5 points
HN discussionSubmitted How to Make NMAP Recognize New Services as a story · 2 points
HN discussionSubmitted InmateBridge: Voice Bridge for Prank Calling as a story · 2 points
HN discussionSubmitted DNS records of 1% .fi domains exposed through Zone Transfers as a story · 2 points
HN discussionSubmitted Harjus v4 adds kernel bypass and more as a story · 1 points
HN discussionSubmitted Chasing Riskless Profits with Triangular Arbitrage Bot on Binance as a story · 1 points
HN discussionSubmitted 9% of nameservers misconfigured to leak all records as a story · 1 points
HN discussion
