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Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

C-ORM: docs, API.

Last 100 entries

Small Success With Go!; Re: Quick message - This link is broken; Adding Reverb To The Echo Chamber; Sox Audio Tools; Would This Have Been OK?; Honesty only important economically before institutions develop; Stegangraphy via PS4; OpenCL Mess; More Book Recommendations; Good Explanation of Difference Between Majority + Minority; Musical Chairs - Who's The Privileged White Guy; I can see straight men watching this conversation and laffing; When it's Actually a Source of Indignation and Disgust; Meta Thread Defending POC Causes POC To Close Account; Indigenous People Of Chile; Curry Recipe; Interesting Link On Marginality; A Nuclear Launch Ordered, 1962; More Book Recs (Better Person); It's Nuanced, And I Tried, So Back Off; Marx; The Negative Of Positive; Jenny Holzer Rocks; Huge Article on Cultural Evolution and More; "Ignoring language theory"; Negative Finger Counting; Week 12; Communication Via Telecomm Bids; Finding Suspects Via Relatives' DNA From Non-Crime Databases; Statistics and Information Theory; Ice OK in USA; On The Other Hand; (Current Understanding Of) Chilean Taxes / Contributions; M John Harrison; Playing Games on a Cloud GPU; China Gamifies Real Life; Can't Help Thinking It's Thoughtcrime; Mefi Quotes; Spray Painting Bike Frame; Weeks 10 + 11; Change: No Longer Possible To Merge Metadata; Books on Old Age; Health Tree Maps; MRA - Men's Rights Activists; Writing Good C++14; Risk Assessment - Fukushima; The Future of Advertising and Surveillance; Travelling With Betaferon; I think I know what I dislike so much about Metafilter; Weeks 8 + 9; More; Pastamore - Bad Italian in Vitacura; History Books; Iraq + The (UK) Governing Elite; Answering Some Hard Questions; Pinochet: The Dictator's Shadow; An Outsider's Guide To Julia Packages; Nobody gives a shit; Lepton Decay Irregularity; An Easier Way; Julia's BinDeps (aka How To Install Cairo); Good Example Of Good Police Work (And Anonymity Being Hard); Best Santiago Burgers; Also; Michael Emmerich (Vibrator Translator) Interview (Japanese Books); Clarice Lispector (Brazillian Writer); Books On Evolution; Looks like Ara (Modular Phone) is dead; Index - Translations From Chile; More Emotion in Chilean Wines; Week 7; Aeon Magazine (Science-ish); QM, Deutsch, Constructor Theory; Interesting Talk Transcripts; Interesting Suggestion Of Election Fraud; "Hard" Books; Articles or Papers on depolarizing the US; Textbook for "QM as complex probabilities"; SFO Get Libor Trader (14 years); Why Are There Still So Many Jobs?; Navier Stokes Incomplete; More on Benford; FBI Claimed Vandalism; Architectural Tessellation; Also: Go, Blake's 7; Delusions of Gender (book); Crypto AG DID work with NSA / GCHQ; UNUMS (Universal Number Format); MOOCs (Massive Open Online Courses); Interesting Looking Game; Euler's Theorem for Polynomials; Weeks 3-6; Reddit Comment; Differential Cryptanalysis For Dummies; Japanese Graphic Design; Books To Be Re-Read; And Today I Learned Bugs Need Clear Examples; Factoring a 67 bit prime in your head; Islamic Geometric Art; Useful Julia Backtraces from Tasks; Nothing, however, is lost with less discomfort than that which, when lost, cannot be missed

© 2006-2015 Andrew Cooke (site) / post authors (content).

Tahoe Least Authority Filesystem / AllMyData.org

From: "andrew cooke" <andrew@...>

Date: Tue, 13 Jan 2009 01:58:38 -0300 (CLST)

This is a distributed, secure file system that uses an erasure code -
http://en.wikipedia.org/wiki/Erasure_code - and a capability access
control model - http://en.wikipedia.org/wiki/Capability-based_security

The idea is that a file is encrypted and split into fragments which are
distributed across many computers.  Only a fraction of those are needed to
reassemble the file (think RAID-5, but encrypted).

The file is identified using a URI that includes the rights (read/write)
to the data (this kind of approach always reminds me of fantasy novels
where knowing something's "true name" gives you power over it).  One
problem with that approach is that it's difficult to keep names secret -
see open issue at

There's a page here that discusses possible uses for such a system -

The source and more info are available via via
http://allmydata.org/source/tahoe/trunk/docs/about.html and
http://allmydata.org/trac/tahoe/wiki/Doc - see papers
http://allmydata.org/~zooko/lafs.pdf and

Obviously(?) you need a gateway that provides access to the data and a
network for that gateway to work with.  If you don't want to build you own
then http://allmydata.com/ seems to be the commercial side of things - $10
a month for unlimited storage (screenshot here shows $5 -


TiddlyWiki on Tahoe

From: "andrew cooke" <andrew@...>

Date: Tue, 13 Jan 2009 02:03:23 -0300 (CLST)

After all that I forgot to give the link that made me start looking at the
whole system - here's Tiddlywiki running on Tahoe.  This is a read-only
link, but you could also distribute the URI for the writable link and make
have a multi-user distributed one-page wiki :o)


(In practice there's no concurrent edit management in Tiddlywiki so it
would be a little frustrating at times...)

Zooko seems to be one of the main Tahoe devs (afaict that's his real name
- I started this wild-goose chase by googling for it after seeing a credit
in the Python docs!)



From: "andrew cooke" <andrew@...>

Date: Tue, 13 Jan 2009 13:11:27 -0300 (CLST)

---------------------------- Original Message ----------------------------
From:    "Francesco Pierfederici" <fpierfed@...>
Date:    Tue, January 13, 2009 8:01 am

Hi Andrew,

Happy new year, first of all ;-)

Have you seen the OFF System? As far as I can tell it tries to do similar




From: "andrew cooke" <andrew@...>

Date: Tue, 13 Jan 2009 13:19:25 -0300 (CLST)


It reminded me of something, but I don't think it was OFF (as far as I
know, I've not seen that before).  I guess there are more of these around?

There are some differences, I think - Tahoe seems to be aiming at
"reliable distributed store with capabilities" while OFF seems to be more
about deniability.  Maybe the former is more likely to make money?

Happy New Year to you too (+ Sylvia),

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