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    Matt Palmer

    hezmatt.org/~mpalmer · Personal blog · on HN since 2011

    Matt Palmer, a systems engineer, writes about TLS certificates, key security, Debian vulnerabilities, and software pitfalls.

    Visit blogHN submissions
    SecurityOpen Source & Linux
    What HN says

    HN commenters link his posts on leaked private keys, the Debian weak keys vulnerability, and a follow-up on redacting private keys in documentation.

    Stats for nerds
    21HN people shared it
    30linked in comments
    1.1Kstory points
    Apr 2025last shared
    2023people per year2025

    Top posts on HN

    1. 1
      How I tripped over the Debian weak keys vulnerability
      2 people · 339 points · first shared 2024 · 101 comments on HN
    2. 2
      Not all TLDs are Created Equal
      2 people · 229 points · first shared 2024 · 277 comments on HN
    3. 3
      Pwned Certificates on the Fediverse
      2 people · 106 points · first shared 2024 · 19 comments on HN
    4. 4
      Why Certificate Lifecycle Automation Matters
      2 people · 104 points · first shared 2024 · 29 comments on HN
    5. 5
      Information Security: "We Can Do It, We Just Choose Not To"
      1 person · 88 points · first shared 2024 · 77 comments on HN
    6. 6
      "Is This Project Still Maintained?"
      1 person · 79 points · first shared 2024 · 63 comments on HN
    7. 7
      Health industry company sues to prevent certificate revocation
      1 person · 78 points · first shared 2024 · 63 comments on HN
    8. 8
      SSL session caching in nginx
      1 person · 76 points · first shared 2011 · 17 comments on HN
    9. 9
      Object deserialization attacks using Ruby's Oj JSON parser
      2 people · 5 points · first shared 2025 · 1 comments on HN
    10. 10
      Falsehoods Programmers Believe About Pagination
      2 people · 5 points · first shared 2018 · 1 comments on HN

    What HN people wrote when they linked it

    • Ethan_BarryJun 2024

      You got it! By approximate category and in no particular order:

      ## MISCELLANEOUS

      - [Low Tech Magazine](https://solar.lowtechmagazine.com), a solar-powered website showcasing the amazing low-tech things you can do with a little ingenuity,

      - [Stephen Wolfram's Blog](https://writings.stephenwolfram.com) on math, compsci, and everything else,

      - [Cool Macrophotography](https://www.barrywebbimages.co.uk/Images/Macro/Slime-Moulds-Myxomycetes) for amazing pictures of tiny things (WARNING: Time Sink!),

      ## COMPUTER SCIENCE

      - [While-True-Do](https://blog.while-true-do.io) has lots of stuff on Linux administration and self-hosting,

      - [Backend Banter](https://www.backendbanter.fm) for a great podcast on backend development,

      - [Two Wrongs](https://two-wrongs.com) for statistics and functional programming,

      - [Math ∩ Programming](https://www.jeremykun.com/) where math and programming intersect! Written by a Googler...

      - [Paul Bourke's site](https://paulbourke.net/) where you can get happily lost exploring old pages on every topic CS touches,

      - [Jason Punyon's blog](https://jasonpunyon.com) for some fun algorithms and things,

      - [Yossi Kreinin's blog](https://yosefk.com/blog) for C, Python, and plenty of non-technical topics,

      - [Adrian Sampson's academic blog](https://www.cs.cornell.edu/~asampson/blog) for an academic's perspective,

      - [Cool polyhedra viewer project](https://georgehart.com/virtual-polyhedra/vp.html) if you like geometry,

      - [Another academic blog on…

    • remramJun 2023

      Generating a new key for documentation seems incredibly easy, or even generating random base64 text. Most of all, searching Google for a random key to use as example seems easiest of all.

      I find it hard to believe that anyone would take their actual production key and redact it for documentation. Does the author have evidence of this in practice, or did they see example keys and assume they were redacted production keys?

      edit: It seems they have found one: https://www.hezmatt.org/~mpalmer/blog/2023/06/12/private-key-redaction-redux.html

    • dangJun 2023

      Thanks. How about we change the URL to the more general article, which has more information and doesn't shame anybody.

      I've changed it from https://www.hezmatt.org/~mpalmer/blog/2023/06/12/private-key-redaction-redux.html now.

    • magnatApr 2024

      If you haven't updated your Debian in a while, 1 in 30000 apparently: https://www.hezmatt.org/~mpalmer/blog/2024/04/09/how-i-tripped-over-the-debian-weak-keys-vuln.html

    • kdklolJun 2023

      The author released another "follow-up" article today: https://www.hezmatt.org/~mpalmer/blog/2023/06/12/private-key-redaction-redux.html

    • pabs3Apr 2025

      It is the Debian associated one, he talks about the project on his blog:

      https://www.hezmatt.org/~mpalmer/blog/

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