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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 23 Oct 2017
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      Replying to @marcan42 @zbrogz

      You can't crack a password if it has sufficient entropy. You can always reverse engineer obfuscation.

      1 reply 0 retweets 0 likes
    2. Zach Brogan  💾‏ @zbrogz 23 Oct 2017
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      Replying to @marcan42

      Which of these is more likely to be attacked? user@ssh_url.com:22, password or user@ssh_url.com:24, password

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 23 Oct 2017
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      Replying to @zbrogz

      Would you use a crappy password and rely on the nonstandard port to deter attackers? That's what security *through* obscurity means.

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 23 Oct 2017
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      Replying to @marcan42 @zbrogz

      The line is simply what is actually secure (mathematically), and what isn't. A password with sufficient entropy is secure. Not a 16-bit port

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 23 Oct 2017
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      Replying to @marcan42 @zbrogz

      Real crypto is secure if the key is kept secret. That isn't "obscurity". Obfuscation isn't secure because you're giving out your code.

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 23 Oct 2017
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      Replying to @marcan42 @zbrogz

      And proprietary crypto may be secure but most likely isn't because crypto is hard, and thus should be considered security through obscurity.

      2 replies 0 retweets 0 likes
    7. Zach Brogan  💾‏ @zbrogz 23 Oct 2017
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      Replying to @marcan42

      My point on obscure ports is that they effectively increase the password bit length, increasing security. But maybe you’re saying that’s

      1 reply 0 retweets 0 likes
    8. Zach Brogan  💾‏ @zbrogz 23 Oct 2017
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      Replying to @zbrogz @marcan42

      ...not obscurity, which makes sense I suppose. I just feel obscurity can be used as an additional layer in some cases.

      1 reply 0 retweets 0 likes
    9. Hector Martin‏ @marcan42 23 Oct 2017
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      Replying to @zbrogz

      But they don't increase the password bit length. This is the "movie password cracking" fallacy. Multiple "passwords" != one longer password.

      1 reply 0 retweets 0 likes
    10. Hector Martin‏ @marcan42 23 Oct 2017
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      Replying to @marcan42 @zbrogz

      A 16-bit constant that you crack *separately* adds negligible security to a strong password. It doesn't add 16 bits of entropy.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 23 Oct 2017
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      Replying to @marcan42 @zbrogz

      Passwords getting cracked character is a movie thing but in the real world additional characters are multiplicative, not additive.

      8:01 PM - 23 Oct 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Hector Martin‏ @marcan42 23 Oct 2017
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          Replying to @marcan42 @zbrogz

          Of course that doesn't mean running SSH on a nonstandard port is useless. I do it too, it cuts down on log spam. But mostly just that.

          1 reply 0 retweets 0 likes
        3. Hector Martin‏ @marcan42 23 Oct 2017
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          Replying to @marcan42 @zbrogz

          Sure, if you get lucky you might stop or deter some attackers, but you should always assume that isn't the case.

          1 reply 0 retweets 0 likes
        4. Show replies
        1. Hector Martin‏ @marcan42 23 Oct 2017
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          Replying to @marcan42 @zbrogz

          * Character by character, I meant.

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