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    Web In Security

    web-in-security.blogspot.com · Personal blog · on HN since 2014

    A security research group's blog on cryptographic attacks and flaws in TLS, PDF encryption and signatures, messaging apps, and printers.

    Visit blogHN submissions
    Security
    What HN says

    HN commenters cite it as a helpful explanation of invalid curve attacks, which leak secret keys when implementations lack proper checks.

    Stats for nerds
    18HN people shared it
    14linked in comments
    339story points
    Apr 2018last shared
    2016people per year2018

    Top posts on HN

    1. 1
      How to Spoof PDF Signatures
      1 person · 222 points · first shared 2019 · 44 comments on HN
    2. 2
      Insecure Features in PDFs (2021)
      1 person · 89 points · first shared 2024 · 30 comments on HN
    3. 3
      Practical Invalid Curves Attack on Java TLS Implementations
      5 people · 6 points · first shared 2015 · 1 comments on HN
    4. 4
      Insecurities of WhatsApp's, Signal's, and Threema's Group Chats
      2 people · 6 points · first shared 2017 · Discussion on HN
    5. 5
      PDFex: Major Security Flaws in PDF Encryption
      2 people · 4 points · first shared 2019 · Discussion on HN
    6. 6
      Old attacks on new TLS implementations
      1 person · 4 points · first shared 2014 · Discussion on HN
    7. 7
      Printer Security
      2 people · 3 points · first shared 2017 · Discussion on HN
    8. 8
      Curious Padding Oracle in OpenSSL (CVE-2016-2107)
      1 person · 2 points · first shared 2016 · Discussion on HN
    9. 9
      CORS misconfigurations on a large scale
      1 person · 2 points · first shared 2017 · Discussion on HN
    10. 10
      An overview on basic certificate types and on few conversion possibilities
      1 person · 1 points · first shared 2015 · Discussion on HN

    What HN people wrote when they linked it

    • NostromovJan 2017

      Yeah, no. That might take several days. Check out some of the names mentioned in the textfile, such as the Heartbleed Bug and then some of the links, such as 'Damage control'.

      Besically, a patch to SSL authentication lead to moar craziness and somehow there's a debate whether the protocol is broken in itself. Well, not broken, but if like everything needs to be rewritten kinda. :)

      ^^ Referring to depreciating the way the auth chains are stacked... Ugh, "MAC-then-Encrypt" @http://web-in-security.blogspot.rs/2016/05/curious-padding-oracle-in-openssl-cve.html

      Edit (looks like I can edit): Sorry, can't edit and it's 4AM losing my mind. There are things that have been exploited 3 years ago and then 1 year ago which are still very much implemented. I think that is the problem.

    • CiPHPerCoderApr 2018

      > How bad is it really?

      Really bad.

      Invalid curve attacks will leak your secret key, which most old implementations (i.e. the ones likely to end up in your hardware) don't protect against.

      If you reuse an ECDSA nonce, you will leak your secret key.

      If you have even the smallest timing leak, guess what.

      https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-7056

      https://web-in-security.blogspot.com/2015/09/practical-invalid-curve-attacks.html

    • exabrialApr 2018

      I found this article helpful: https://web-in-security.blogspot.com/2015/09/practical-invalid-curve-attacks.html

      Essentially, a bunch of ECC implementations didn't do proper bounds checking and leaked data. ECC still offers a lot of benefits in terms of key size, performance, and security, however, so do your research carefully.

    • pbsdMar 2016

      I'm with you on this one. This 'RSA is evil' conclusion is like taking a look at [1]---or the gazillion Schnorr-style signature scheme nonce leaks published over the years---and concluding that elliptic curves are evil.

      [1] http://web-in-security.blogspot.com/2015/09/practical-invalid-curve-attacks.html

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