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saleemrash1d's profile
Saleem Rashid
Saleem Rashid
Saleem Rashid
@saleemrash1d

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Saleem Rashid

@saleemrash1d

doing bad maths · researching security · http://github.com/saleemrashid 

United Kingdom
saleemrashid.com
Joined July 2015

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    1. DanielMicay‏ @DanielMicay 2 Nov 2018
      • Report Tweet
      Replying to @DanielMicay @nitrokey and

      It doesn't include any proprietary software and the whole thing is an open design that other people are able to build (and have successfully done so in practice). The primary purpose is for cryptocurrency wallets but it works well for U2F, GPG, SSH and various other purposes too.

      1 reply 0 retweets 0 likes
    2. DanielMicay‏ @DanielMicay 2 Nov 2018
      • Report Tweet
      Replying to @DanielMicay @nitrokey and

      There are definitely options beyond proprietary ones, including options with much different approaches than a traditional HSM storing the keys with / without encryption (ideally with a passphrase entered onto the device). I really like the approach pioneered for Bitcoin wallets.

      1 reply 0 retweets 1 like
    3. DanielMicay‏ @DanielMicay 2 Nov 2018
      • Report Tweet
      Replying to @DanielMicay @nitrokey and

      Since that lets you generate keys on the hardware wallet, back up the high entropy recovery seed as a phrase, verify you backed it up correctly and then if you need to recover on a new device you can enter it directly onto a new hardware wallet without exposing it to a computer.

      1 reply 0 retweets 0 likes
    4. DanielMicay‏ @DanielMicay 2 Nov 2018
      • Report Tweet
      Replying to @DanielMicay @nitrokey and

      The traditional approach is good if you have existing SSH and GPG keys that need to be moved onto an HSM. I'll definitely prefer the deterministic wallet approach for new keys though. It's not that bad to migrate to new SSH keys but GPG tends to make rotating keys very painful.

      1 reply 0 retweets 0 likes
    5. DanielMicay‏ @DanielMicay 2 Nov 2018
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      Replying to @DanielMicay @nitrokey and

      Signing keys for firmware usually can't be rotated at all since they're burned into fuses so that's another case where a more traditional HSM is the best option since existing keys need to be migrated. Android app signing keys were similar, but they've finally added key rotation.

      1 reply 0 retweets 0 likes
    6. Robert Spigler  🔑‏ @RobertSpigler 2 Nov 2018
      • Report Tweet
      Replying to @DanielMicay @nitrokey @Whonix

      I really like the @nitrokey - code has been audited by @cure53berlin so that is a huge plus in my book, and there's tons of eyes on the code as @linuxfoundation maintainers use them as well. Nothing against @Trezor - they are an incredible company and I use their devices for btc

      2 replies 0 retweets 0 likes
    7. Robert Spigler  🔑‏ @RobertSpigler 2 Nov 2018
      • Report Tweet
      Replying to @RobertSpigler @DanielMicay and

      Entering a password on device (like you mention) is a big plus for Trezor though, as is their open CPU. (What smart card does nitrokey use?)

      1 reply 0 retweets 0 likes
    8. DanielMicay‏ @DanielMicay 2 Nov 2018
      • Report Tweet
      Replying to @RobertSpigler @nitrokey and

      I find the recovery model to be the biggest advantage of the approach based on deterministic wallet design. The hardware wallet generates a high entropy seed, displays it as a recovery phrase and you can write it down, store it and recover without exposing it to the computer.

      2 replies 1 retweet 1 like
    9. Saleem Rashid‏ @saleemrash1d 2 Nov 2018
      • Report Tweet
      Replying to @DanielMicay @RobertSpigler and

      for the record, i actually wrote an implementation of OpenPGP smartcard emulation (á la Gnuk) for the Trezor One a few years back. the code is still in a branch on my GitHub, but never got around to refactoring and doing security review.

      1 reply 0 retweets 1 like
    10. DanielMicay‏ @DanielMicay 2 Nov 2018
      • Report Tweet
      Replying to @saleemrash1d @spudowiar and

      It's the approach to the security model including recovery, passphrases and on-device input / confirmations that I like rather than the hardware though. I don't want to import keys generated on my computer or expose them to it from cold storage if I need to do recovery, etc.

      3 replies 0 retweets 1 like
      Saleem Rashid‏ @saleemrash1d 2 Nov 2018
      • Report Tweet
      Replying to @DanielMicay @RobertSpigler and

      it was an addition to the existing firmware and used keys generated from the recovery seed (with PIN and passphrase support)

      4:16 PM - 2 Nov 2018
      • 2 Likes
      • Robert Spigler 🔑 DanielMicay
      2 replies 0 retweets 2 likes
        1. Saleem Rashid‏ @saleemrash1d 2 Nov 2018
          • Report Tweet
          Replying to @saleemrash1d @DanielMicay and

          with the Model T, the implementation would have been simpler (the authentication can be done on device, then the smartcard interface doesn't need to be brought up until device is unlocked) but Model T didn't exist yet ;)

          0 replies 0 retweets 2 likes
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        2. DanielMicay‏ @DanielMicay 2 Nov 2018
          • Report Tweet
          Replying to @saleemrash1d @spudowiar and

          Ah, I misunderstood what you meant. I'm successfully using their current SSH support already and I plan on using their GPG support to replace my existing aging key which has been exposed to multiple generations of laptops and workstations. GPG makes key rotation horrible though.

          1 reply 1 retweet 0 likes
        3. Saleem Rashid‏ @saleemrash1d 2 Nov 2018
          • Report Tweet
          Replying to @DanielMicay @RobertSpigler and

          the aim was to eventually implement full smartcard support, so anything that supported PKCS#11 could magically benefit from the recovery seed approach :)

          0 replies 0 retweets 2 likes
        4. End of conversation

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