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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 24 Jun 2019
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      Daniel Vassallo Retweeted Daniel Vassallo

      I plan to release the prototype todo app on GitHub next week. It will be scrappy & very simple, but will prove the concept: A fully working OSS web app with end-to-end encryption and client-side DB. I'll announce the release here & on the mailing list: https://updates.encrypted.dev/subscribe .https://twitter.com/dvassallo/status/1140818405160673280 …

      Daniel Vassallo added,

      Daniel Vassallo @dvassallo
      Proof of concept coming along well. Here's an end-to-end encrypted Todo app. DynamoDB is holding the transaction log of all db operations, and the record field is encrypted with a 🔑 that never leaves the user's browser. This week will focus on perf. Will update with results. pic.twitter.com/ClAutG0nv1
      Show this thread
      2 replies 1 retweet 42 likes
      Show this thread
    2. Daniel Vassallo‏ @dvassallo 5 Jul 2019
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      Just a few small things to finish. Targeting POC release early next week now. Here's a peek at the DB API. It's a schema-less document store, so any JSON record is valid. On my high-end MBP I'm querying 10K records (4MB) in 0.8s via a web worker (a separate browser thread).pic.twitter.com/RyeUeEucen

      3 replies 1 retweet 8 likes
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    3. Daniel Vassallo‏ @dvassallo 5 Jul 2019
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      Daniel Vassallo Retweeted Brian Rosamilia

      Does the browser download the entire database for every query? No. I shared some details about that here:https://twitter.com/brianrosamilia/status/1147348812442345472?s=21 …

      Daniel Vassallo added,

      Brian Rosamilia @BrianRosamilia
      Replying to @dvassallo
      How does the search example work without bringing an entire index (or the entire dataset) down to the client in its entirety to decrypt it? Curious how you are solving that
      1 reply 0 retweets 3 likes
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    4. Daniel Vassallo‏ @dvassallo 7 Jul 2019
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      Spent a few hours styling the to-do app with @tailwindcss. Not a critical aspect of the proof of concept, but why not?pic.twitter.com/GKmYU4tynk

      3 replies 0 retweets 14 likes
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    5. Daniel Vassallo‏ @dvassallo 7 Jul 2019
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      And here's what got stored on the server. It's a transaction log of all the actions, with the data encrypted by the browser's key. The 1st Update was the completion of item 2, and the 2nd Update was the emoji edit. The item-id is browser-generated to ensure idempotent inserts.pic.twitter.com/77fFFxnvV1

      3 replies 1 retweet 8 likes
      Show this thread
    6. Colm MacCárthaigh‏ @colmmacc 7 Jul 2019
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      Replying to @dvassallo

      Do you pad the size of the log? Some protocols do, some don't. I always prefer to pad to prevent leaking the size of the operations/data, which can sometimes reveal things inadvertently.

      1 reply 0 retweets 2 likes
    7. Daniel Vassallo‏ @dvassallo 7 Jul 2019
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      Replying to @colmmacc

      I'm not padding right now. Since I want to allow storing very large records (with offload to S3) I can't just pad everything to the max size. Maybe I could pad records smaller than certain size. Or maybe it's good enough privacy without padding. Will think more about it. Thanks.

      1 reply 0 retweets 0 likes
      Colm MacCárthaigh‏ @colmmacc 7 Jul 2019
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      Replying to @dvassallo

      Padding to the nearest power of two is a common pattern for variable data sizes. Even padding to the nearest 16 bytes can defeat a lot of practical content fingerprinting. Gets better the bigger you make the pad obviously.

      1:44 PM - 7 Jul 2019
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      • Justin Berman thompson Khai Tran Daniel Vassallo
      1 reply 0 retweets 4 likes
        1. Daniel Vassallo‏ @dvassallo 7 Jul 2019
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          Replying to @colmmacc

          That's great! Thanks for the tip. I could default to power of two padding, and let the client choose nearest 16 bytes if space efficiency is a concern.

          0 replies 0 retweets 1 like
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