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ragle

157 karma · joined November 12, 2013

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ragle··on I Accidentally Uncovered a Nationwide Scam on Airbnb
Interesting - makes me wonder if this scam is what was being pulled in my comment here: https://news.ycombinator.com/item?id=21410039

Though in this case, the difference in price is about 50%.

ragle··on I Accidentally Uncovered a Nationwide Scam on Airbnb
I wonder if I almost fell for this (or similar) in Pattaya, Thailand just a few days ago?

[1] - https://abnb.me/eUIhQCkMe1

[2] - https://abnb.me/DvHRkqsMe1

At first, I thought maybe this was just a shady property management company hocking two otherwise-legit, similarly-furnished condos with the same floor plan in the same building through two different accounts - but they are in different buildings separated by about half a kilometer according to the map.

ragle··on Ask HN: Are Lucene/Solr/ES Still Used for Search?
> AWS's hosted solution is poor

What has been poor about it in your experience?

ragle··on Sia – Decentralized cloud storage network
It's confusing, because they refer to themselves as a potential competitor to S3 several times in the linked article, but I thought I read somewhere that conceptually what they're building is actually just the data persistence layer of a service like S3?

A complete S3-like service would require a third-party tool on top of Sia. Goobox[1], for example, uses sia as a storage backend and provides an S3-compatible API[2].

In other words, right now - I think if you are interacting with Sia directly you can do whatever you want with the files you have access to. Not 100% sure about that.

[1] - https://goobox.io/

[2] - https://doc.goobox.io/#section/Why-you-should-choose-Goobox-...

ragle··on The Asynchronous Computability Theorem
In figure 3, the edge between P0 and Q1 is labeled: "1-simplex (edge) P, R choose 0,2".

Should that be "1-simplex (edge) P, Q choose 0,1"?

ragle··on Is Quora Down? Finding 504s
Same here.
ragle··on Reverse Culture Shock
Another phenomena that can creep up on well-traveled folks is "the curse of the traveller" (obviously not a technical term, but I've not heard another name for it).

Essentially, you subconciously collect "likes" about each place where you spend a sufficient amount of time.

The food in this place, the coffee shops somewhere else, a street market culture here, the women/men there. A language, the climate, pace of life and attitudes from other places.

With time, the mind constructs its own personal Shangri-la (which contains _all_of these things) and you, explicitly and/or implicitly, spend the rest of your life dissatisfied with the delta on your actual experience.

In practice, for me this has been more of an "ah... that's happening, heh" thing that I observe going on in the mind rather than a difficult-to-live-with curse.

I'm curious, however, what the effects will look like another 10 or 20 years in. I suspect it could grow worse with age as we are able to travel and do less? That's hopefully just a matter of managing perspective, though.

ragle··on Bitpacking and Compression of Sparse Datasets
Ah, hate I missed this at the time of comment (got on a flight right after I posted and forgot to check back :/).

What you're describing (moving complexity into the algorithm) _is_ an increase in Komogorov Complexity, though... so I think we're saying the same thing?

i.e. Kolmogorov complexity K(x|y) (x, given y) is the length of the shortest program that on input y, outputs x.

So, when you say "move complexity into the algorithm", this is an increase the length of the shortest program that given input <data to compress> outputs <compressed data>.

Or have I missed or misunderstood your point?

ragle··on Bitpacking and Compression of Sparse Datasets
> If you know the structure of your data, you can easily do a better and faster job of compressing than a generic compression algorithm.

I'd change this to: the ease of doing a better and faster job of compressing than a generic compression algorithm will be a function of the data's Kolmogorov Complexity.

You can easily know your data's structure (e.g. strings no larger than N bytes containing natural language in a line-separated file) and not be able to (easily) do better than a generic compressor due to the complexity of the required compression / reconstruction operations.

ragle··on How Meditation Changes the Brain and Body
Actually, this isn't the case.

Your (mis)understanding (that meditation is spacing out and "not thinking") seems to be the common western one. In my experience, this is usually due to misunderstood ideas about practices like dzogchen or philosophical concepts like dependent origination.

Concentration is actually at the _heart_ of meditation and is a key element of the Buddhist noble eight-fold path.

Mindfulness is merely well-concentrated investigation. Once someone has developed an ability to cultivate sustained, one-pointed attention - they can use this attention to clearly investigate internal and external phenomena.

Many Asian schools have the first four Samatha Jhanas (deeply-concentrated states) as strict prerequisites for beginning Vipassana (insight / mindfulness) practice. Others regard "access concentration" as the only prerequisite.

In any case, a well-concentrated mind is required to clearly observe oneself. Yes, other thoughts will drop away as the mind naturally gravitates toward the joy and rapture of mental seclusion (from disturbing, burdensome thoughts and mental states) - but this is a _byproduct_ of concentration, not a fruit of _avoiding_ concentration.

The concentration states (along with the Brahma Viharas) can also be welcome refuges for when reality starts to come apart as one progresses through the Vipassana Nanas.

These things are very clearly spelled out in the canonical Buddhist texts and especially the commentaries[1][2]. Westerners seeking to "change their brains" do so at their peril without proper guidance. Peeling away the layers of delusion can be a destabilizing process for some[3].

Bhante Henepola Gunaratana's book "Mindfulness in Plain English" is a very accessible (and worthwhile) introduction to the subject[4].

[1] - [pdf] http://www.accesstoinsight.org/lib/authors/nanamoli/PathofPu...

[2] - [pdf] http://urbandharma.org/pdf1/Path_of_Freedom_Vimuttimagga.pdf

[3] - http://www.theatlantic.com/health/archive/2014/06/the-dark-k...

[4] - http://www.amazon.com/Mindfulness-English-Bhante-Henepola-Gu...

ragle··on Ask HN: Who is hiring? (December 2014)
I had a quick look at your hiring process[1] (thank you for sharing this, btw).

I have a few questions:

* Are junior hires expected to be able to complete / pass all three challenges (pentesting, fuzzer, custom protocol analysis)?

* If not - how does the hiring / challenge process differ for junior hires?

* Assume good problem solving skills, effective (written and verbal) communication skills and an ability to program. What else do you like to see in a junior hire?

Ultimately, I'm trying to suss out the breadth / depth of self-instruction I need to undertake to pass interviews and perform successfully on the job as a new junior staff member at Matasano, or another selective / reputable company like it. Any other advice you could offer a developer making a transition to appsec would be much appreciated! :)

Cheers!

[1] - http://matasano.com/careers/

Edit - Found this: http://krebsonsecurity.com/2012/06/how-to-break-into-securit... - pretty comprehensive advice. Still curious about the interviews and what you guys look for though!

ragle··on Winnowing: Local Algorithms for Document Fingerprinting (2003) [pdf]
I just finished my undergraduate senior project, which involved investigating whether or not the normalized compression distance[1][2] could be used to build a featureless clustering and classification system for Thai-language documents.

An interesting use case for the NCD is authorship attribution and plagiarism detection[3]. At one point during my project, while I was collecting documents for the corpus we used - I noticed very low NCD scores between some of the documents.

Sure enough, all of the documents with a compression distance between ~0.01 and 0.1 were either complete or heavy plagiarizations of each other! We lost around 15 documents, but at least we knew the NCD functionality was working! :)

if you think including NCD measurements in your system could be helpful, be sure to check out the findings from [4] if you'll be working with any larger documents.

[1] - http://en.wikipedia.org/wiki/Normalized_compression_distance

[2] - http://homepages.cwi.nl/~paulv/papers/cluster.pdf

[3] - http://www.inf.ufpr.br/lesoliveira/download/FSI2013.pdf

[4] - http://www.ims.cuhk.edu.hk/~cis/2005.4/01.pdf

ragle··on Visualizing the Fourth Dimension Using Color
I think your circles analogy is good.

To tie it in a bit tighter with OPs article, I would just add that if we could only perceive two dimensions, the inner circle would disappear as we "move the circle up and away from the 2d plane".

It would only reappear to us once we moved it back down into our plane of perception, safely outside of the other circle.

The relevant bit from OPs article that this is analogous to is:

> "What would we see if you watched this happen in real life? Since we can't see anything outside our 3D slice of 4D space, from our perspective the moving (green) loop would disappear, to reappear later in the unknotted position."

ragle··on Visualizing the Fourth Dimension Using Color
Those that enjoyed this may also enjoy the film "Dimensions".

A brief guide for the film that gives an overview: http://www.dimensions-math.org/Dim_tour_E.htm#guide

Watch online (Deutsch, English, French, Spanish, Italian, Japanese, Russian and Arabic subs available): http://www.dimensions-math.org/Dim_regarder_E.htm

ragle··on Poll: what smartphone do you use as your primary smartphone?
I live in Thailand. The selection here is somewhat limited and phones are typically more expensive than phones in the states.

I picked up a white Lenovo s820 [1][2] for ~$230 without a contract. I saw someone else mention in the thread that "they didn't know Lenovo made phones" - which was me as well before I went shopping for a new phone!

The s820 fit my criteria of thin, light, 4.7" screen and decent specs better than everything except the HTC One X. As a satisfied former Ideapad owner, I felt comfortable going out on a limb that Lenovo's notebook quality would generalize to its smartphone offerings.

So far (~4 months), it has. Apart from the somewhat disappointing camera quality, I've been really pleased.

[1] - http://www.gsmarena.com/lenovo_s820-5486.php

[2] - http://www.youtube.com/watch?v=XpnOMAp8I6M&t=1m44s

ragle··on Firefox OS 2.0 starts emerging from its cocoon
The developing world: http://www.cnet.com/news/with-firefox-os-mozilla-begins-the-...
ragle··on Japanese Toilets: The Future Called 30 Years Ago
When I first came to Thailand, I was appalled when one of my friends told me the pistol nozzle (like we use in the US for doing dishes) next to every Thai toilet[1] was for spraying yourself after using the bathroom.

This was disgusting to me at first.

Echoing a few other comments, I feel like a bidet is something you have to experience yourself before you trust it. Once you do though, I think you are forever changed.

On my last trip back to the states, I remember feeling perpetually disgusted that all I had to clean myself with was paper. It's disgusting - barbaric even... you're just smearing waste all over yourself.

If you don't feel like spending the money to install a Japanese bidet, a Thai "bum gun" might be a more wallet-friendly option.

[1] - http://thatluckyboy.com/wp-content/uploads/2013/05/bum_gun_t...

ragle··on Google Acquires Boston Dynamics
Thanks for spotting this and pointing it out.

I'll take your word for it about Kurzweil. The wiki also says "a director" - good catch.

Here's what google says about Norvig though: http://research.google.com/pubs/author205.html

FWIW, I don't think reporting to higher ups (e.g. VP, SVP) precludes someone from being "the director" if there are no other people in the department with this title / position.

ragle··on Google Acquires Boston Dynamics
Seriously. These were precisely the first words out of my mouth as well.

Worth pointing out that Ray Kurzweil[1] is the director of engineering at google, Peter Norvig[2] is the director of research, and they recently snatched up Geoffrey Hinton[3] and several of his grad students.

Not sure if excited or terrified. The future of google is going to be very interesting...

[1] - http://en.wikipedia.org/wiki/Ray_Kurzweil [2] - http://en.wikipedia.org/wiki/Peter_Norvig [3] - http://en.wikipedia.org/wiki/Geoffrey_Hinton

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