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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 12 Mar 2020
      • Report Tweet
      • Report NetzDG Violation

      Hector Martin Retweeted Guido Appenzeller

      The Chief Product Officer at Yubico thinks "long passwords" offer little security. 2ee75ee4e4b359576257fc7d3bfc5ec75d358f10e17caf9e668e09cc032af36d That is the SHA256 of the 76-character passphrase to my master backups, plus '!'. Pwn me. I'm waiting.https://twitter.com/appenz/status/1238121735142031360 …

      Hector Martin added,

      Guido Appenzeller @appenz
      Replying to @appenz @marcan42 and 2 others
      And I am not sure how effective wrapping really is. The secure element has very low compute performance as it needs to operate with just NFC power. Today brute force attacks run on huge farms of cheap AWS spot instances and even long PINs/Passwords offer little protection.
      9 replies 25 retweets 126 likes
    2. Juliano Rizzo‏ @julianor 12 Mar 2020
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      Replying to @marcan42

      so you exposed your decryption key to a computer just to hash it and post a tweet! You are doing it wrong, you can encrypt backups using a public key and store the private key in a Yubikey ;)

      1 reply 0 retweets 1 like
    3. Hector Martin‏ @marcan42 12 Mar 2020
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      Replying to @julianor

      This is an offsite disaster recovery key, it's very deliberately a very long symmetric key so I do not need to rely on physical artifacts that I might lose to use it.

      1 reply 0 retweets 3 likes
    4. Juliano Rizzo‏ @julianor 12 Mar 2020
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      Replying to @marcan42

      you can backup the private key in paper

      1 reply 0 retweets 1 like
    5. Hector Martin‏ @marcan42 12 Mar 2020
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      Replying to @julianor

      Paper is still a physical artifact. Like the HDD that passphrase unlocks. Where would I keep it? Next to the server? No point.

      1 reply 0 retweets 1 like
    6. Juliano Rizzo‏ @julianor 12 Mar 2020
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      Replying to @marcan42

      do you remember your long symmetric key?

      1 reply 0 retweets 1 like
    7. Hector Martin‏ @marcan42 12 Mar 2020
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      Replying to @julianor

      Yes.

      1 reply 0 retweets 3 likes
    8. Juliano Rizzo‏ @julianor 12 Mar 2020
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      Replying to @marcan42

      you can make a EC pair from it

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 12 Mar 2020
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      Replying to @julianor

      It's not 76 *completely random* characters (but with plenty of entropy). Though I could make an EC pair out of a hash, sure. Not much point though. It does not encrypt the backups directly, so the top level layer is mostly irrelevant.

      9:57 AM - 12 Mar 2020
      • 2 Likes
      • kackerhitty NullMind
      0 replies 0 retweets 2 likes

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