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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. Daniel Vassallo‏ @dvassallo 10 May 2019
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      Daniel Vassallo Retweeted Daniel Vassallo

      OK, I decided to build this and try to make a living off it: An end-2-end encrypted serverless platform for web/mobile apps, offering user auth, db, & file store services. The end user gets privacy. The app developer gets spared from the liability & burden of handling user data.https://twitter.com/dvassallo/status/1122968287355129856 …

      Daniel Vassallo added,

      Daniel Vassallo @dvassallo
      User data is a liability. This is a problem I'm seriously exploring right now. You know how @1Password can never see your passwords even though they're saved in the cloud? Imagine if there was an easy way for anyone to build web apps with that promise. https://twitter.com/Pinboard/status/1122960211239563264 …
      Show this thread
      23 replies 12 retweets 199 likes
      Show this thread
    2. Daniel Vassallo‏ @dvassallo 10 May 2019
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      Neither the app developer, nor me (the platform) will be able to see any user data. (Same as what @1Password does.) This also means automatic GDPR compliance for the app developer. I'll share a lot more technical and business details in a few days. I'll also open source it. ✌️

      9 replies 4 retweets 86 likes
      Show this thread
    3. Daniel Vassallo‏ @dvassallo 11 May 2019
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      Here's the mailing list if you want to keep up to date. No more than 1 to 2 emails a month. https://updates.encrypted.dev/subscribe  🙏pic.twitter.com/eJfW7CDX5E

      2 replies 2 retweets 30 likes
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    4. Daniel Vassallo‏ @dvassallo 13 May 2019
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      Some more details: The platform will offer 3 core services: 1️⃣ Account Management 2️⃣ Database 3️⃣ File Store All these will be available through a JavaScript API for the browser. Initial iOS and Android support will be through @reactnative.

      2 replies 0 retweets 10 likes
      Show this thread
    5. Daniel Vassallo‏ @dvassallo 13 May 2019
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      A user signup generates an asymmetric key pair in the browser. The public key gets sent to the platform along with the username & password. The private key gets stored in the browser’s local storage and downloaded to be put somewhere safe, or printed as a QR code.

      3 replies 1 retweet 5 likes
      Show this thread
    6. Daniel Vassallo‏ @dvassallo 13 May 2019
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      User authentication happens through a process similar to passwordless ssh: The platform encrypts a random message with the user’s public key that only the holder of the private key can decrypt. The decrypted message gets sent to the platform, and a match authenticates the user.

      2 replies 0 retweets 4 likes
      Show this thread
    7. Colm MacCárthaigh‏ @colmmacc 13 May 2019
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      Replying to @dvassallo

      PAKE would be better overall, but if you want to use an asymmetric key directly, signing is far far better for this case than encryption.

      1 reply 0 retweets 0 likes
    8. Daniel Vassallo‏ @dvassallo 13 May 2019
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      Replying to @colmmacc

      When you say PAKE is better, is that just performance? Or better security or UX? I’ll look more into it. Thanks. PS. I was only thinking of encrypting a challenge message once during the WebSocket setup (upon user login). Then that connection stays authenticated.

      1 reply 0 retweets 0 likes
    9. Colm MacCárthaigh‏ @colmmacc 13 May 2019
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      Replying to @dvassallo

      PAKE is a ZKP scheme that starts with their password, which is where real-world users will begin, so it just tends to remove layers and can be portable without having to export/import keys. Implementing auth as encrypting a challenge is a classic cryptographic design mistake.

      1 reply 0 retweets 0 likes
      Colm MacCárthaigh‏ @colmmacc 13 May 2019
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      Replying to @colmmacc @dvassallo

      It tends to expose the encrypted to arbitrary (i.e. large sizes) and malicious (i.e. padding oracles) inputs. Signing is specifically designed for proof of key possession and has a lot of thought through defenses.

      7:56 AM - 13 May 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Colm MacCárthaigh‏ @colmmacc 13 May 2019
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          Replying to @colmmacc @dvassallo

          Usual pattern is to establish a channel with DH, and to sign the DH shares. Gives you forward secrecy and proof of key. Asymmetric key encryption isn't used in modern network encryption. Ok-ish for durable data envelope encryption.

          1 reply 0 retweets 0 likes
        3. Colm MacCárthaigh‏ @colmmacc 13 May 2019
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          Replying to @colmmacc @dvassallo

          For the sharing encrypted data, DBs or channels, that's an open hard problem. If you share the underlying encryption key, it has to be bulk-reencrypted on revoke. If you do pair-wise, you have to denormalize and can end up with N^2 key establishment problems.

          1 reply 0 retweets 0 likes
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