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Sarah Jamie Lewis Profile picture
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5 Aug, 4 tweets, 1 min read
"Stop using encryption so we can can check your messages for criminal activity" becomes "Allow us to scan all the files on your computer for criminal activity"
I'm so tired. Maybe let's not do the dystopia of corporations building cop bots into general purpose computers.
At some point protecting your privacy is going to boil down to not using devices that actively spy on you. No amount of overlay software can protect you from making a bad choice there.

Don't support corps that scan your computer for crimes seems pretty fucking basic.
A regular fucking reminder regarding living in a free society.

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More from @SarahJamieLewis

Sarah Jamie Lewis Profile picture
5 Aug
Clearly a rubicon moment for privacy and end-to-end encryption.

I worry if Apple faces anything other than existential annihilation for proposing continual surveillance of private messages then it won't be long before other providers feel the pressure to do the same.
You can wrap that surveillance in any number of layers of cryptography to try and make it palatable, the end result is the same.

Everyone on that platform is treated as a potential criminal, subject to continual algorithmic surveillance without warrant or cause.
If Apple are successful in introducing this, how long do you think it will be before the same is expected of other providers? Before walled-garden prohibit apps that don't do it? Before it is enshrined in law?
Read 5 tweets
Sarah Jamie Lewis Profile picture
25 May
Today I spent 5 hours debugging, and finally moved a single line of code up 10 lines.

Reduced cpu usage 20x.

Just want that on the record.
Basically: something that was supposed to get called once per app run, was getting called on every top-level UI rebuild, and because it updated one of the main global settings providers that update was also triggering a top level UI rebuild - so there was a rebuild cascade.
Moved the call out to where it actually belongs...no more rebuild cascade, all the consumers are now caching properly, all the render boundaries are kicking in and everything is now ridiculous fast.
Read 8 tweets
Sarah Jamie Lewis Profile picture
23 May
Need a break from research, ask me any cryptocurrency/blockchain related question and I will give you my honest, unfiltered answer.
Only if we consider all transactions as equally valuable to store - which their not. Ultimately blockchain space is a limited resource and is subject to the same economic constraints as other limited resources.
Any legitimacy that smart contracts might have had died when the DAO was reversed. Either code is law damn the consequences, or smart contracts are just as fragile as any other mechanism when it comes to mob justice.

Read 50 tweets
Sarah Jamie Lewis Profile picture
21 May
After all the performance tweaks I did yesterday, I remembered today that dalek crypto has avx2 support...

Generating a tag: 689.34μs
Testing a tag: 424.31μs ImageImage
With previous improvements + avx2 finding a fully entangled tag (one that will match for 2 different tagging/verification keys) now takes ~79 seconds on a consumer desktop. Image
That's much less than my original estimates of ~15 minutes prior to any of these optimizations - and pushes entangled tags from a curiosity into something that is potentially practical.
Read 7 tweets
Sarah Jamie Lewis Profile picture
16 May
The most important understanding I've come to involving cryptocurrency is that there exists are large portion of people who absolutely don't understand the point of decentralization (of power) and consider the expense of decentralization a defect (that they can "fix").
Prior to that, I had some ridiculously frustrating conversations regarding e.g. why some structure wasn't actually "decentralized" because the power was concentrated in some entity.

Then I realized that those teams weren't actually interested in decentralizing power.
Decentralization ultimately became a marketing term used to describe the number of entities involved in a consensus, rather than the mechanisms over which power was transferred to and between those entities.

A shame, but not unexpected.
Read 7 tweets
Sarah Jamie Lewis Profile picture
16 May
It was a sunny day today so I did some more satellite captures. Fixed up the antenna a little, and also dug out an LNA and tested some passes with/without. I had 2 passes clobbered by METEOR-M2, and the rest were pretty low, but overall I think this setup is improving. ImageImage
Decided to stay out late since the last pass of the evening was pretty high, and I'm glad I did... Image
This the definitely the best capture I've ever had, the LNA definitely helps with the new antenna. I think if I could get it up a little higher it would do even better. I'd like to eventually build a QFH but the performance of the v-dipole is awesome considering the limitations.
Read 7 tweets

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