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DanielMicay's profile
DanielMicay
DanielMicay
DanielMicay
@DanielMicay

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DanielMicay

@DanielMicay

Security researcher working on mobile privacy/security. Memory allocators, compilers, language design, attestation, sandboxing, permission models, etc.

Toronto, Ontario, Canada
github.com/thestinger
Joined June 2018

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

      I mentioned the Trezor earlier particularly Model T where passphrase and recovery seed can be entered on it directly. It has a different model than a typical HSM since it doesn't store anything other than the seed which is combined with entered passphrases to derive wallets/keys.

      1 reply 0 retweets 0 likes
    2. 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
    3. 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
    4. 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
    5. 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
    6. DanielMicay‏ @DanielMicay 2 Nov 2018
      • Report Tweet
      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
    7. 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
    8. 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
    9. 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
    10. DanielMicay‏ @DanielMicay 2 Nov 2018
      • Report Tweet
      Replying to @DanielMicay @RobertSpigler and

      I need backups for my keys. For a traditional HSM, that means I need to generate them on my computer, back them up onto cold storage and import them onto the HSM. If I ever need to do recovery, I need to expose them to a general purpose computer again too. That's problematic.

      2 replies 1 retweet 3 likes
      DanielMicay‏ @DanielMicay 2 Nov 2018
      • Report Tweet
      Replying to @DanielMicay @RobertSpigler and

      Entering a passphrase directly on the device is another nice property of the Trezor Model T, but a traditional HSM can support that for encrypting keys and still wouldn't have the solid approach to recovery or the deniability from all passphrases leading to valid wallets/keys.

      4:00 PM - 2 Nov 2018
      • 1 Retweet
      • DanielMicay
      1 reply 1 retweet 0 likes
        1. New conversation
        2. DanielMicay‏ @DanielMicay 2 Nov 2018
          • Report Tweet
          Replying to @DanielMicay @RobertSpigler and

          I'd really like to see other implementations of the same model they've designed. There are many other cryptocurrency wallets doing it but it's just as applicable to U2F, SSH and GPG which are also provided by a Trezor. I'd like to see alternatives with compatible implementations.

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

          Another advantage is that the Trezor Model T has you confirm actions on the device for U2F, SSH, GPG, etc. It doesn't just have that for sending a Bitcoin transaction or verifying a receive address by showing it as text / qr code on the device. It has you confirm U2F/SSH/GPG use.

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

          The disadvantage of the deterministic wallet approach is you can't use it to important and secure existing keys, so you need a mechanism for key rotation. Similarly, if you decide to change the passphrase, that involves key rotation since keys are derived from seed + passphrase.

          2 replies 1 retweet 0 likes
        5. DanielMicay‏ @DanielMicay 2 Nov 2018
          • Report Tweet
          Replying to @DanielMicay @RobertSpigler and

          It's how I'll be handling SSH, GPG and other keys in the future. The traditional HSM approach doesn't work for me because I need backups of the keys. For U2F, it's also silly you need recovery codes for each site. I have offline recovery for U2F as a whole with this approach.

          0 replies 1 retweet 0 likes
        6. End of conversation

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