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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.

Last 100 entries

Ssh, tty, stdout and stderr; Feathers falling in a vacuum; Santiago 30m Bike Route; Mapa de Ciclovias en Santiago; How Unreliable is UDP?; SE Santiago 20m Bike Route; Cameron's Rap; Configuring libxml with Eclipse; Reducing Combinatorial Complexity With Occam - AI; Sentidos Comunes (Chilean Online Magazine); Hilary Mantel: The Assassination of Margaret Thatcher - August 6th 1983; NSA Interceptng Gmail During Delivery; General IIR Filters; What's happening with Scala?; Interesting (But Largely Illegible) Typeface; Retiring Essentialism; Poorest in UK, Poorest in N Europe; I Want To Be A Redneck!; Reverse Racism; The Lost Art Of Nomography; IBM Data Center (Photo); Interesting Account Of Gamma Hack; The Most Interesting Audiophile In The World; How did the first world war actually end?; Ky - Restaurant Santiago; The Black Dork Lives!; The UN Requires Unaninmous Decisions; LPIR - Steganography in Practice; How I Am 6; Clear Explanation of Verizon / Level 3 / Netflix; Teenage Girls; Formalising NSA Attacks; Switching Brakes (Tektro Hydraulic); Naim NAP 100 (Power Amp); AKG 550 First Impressions; Facebook manipulates emotions (no really); Map Reduce "No Longer Used" At Google; Removing RAID metadata; New Bike (Good Bike Shop, Santiago Chile); Removing APE Tags in Linux; Compiling Python 3.0 With GCC 4.8; Maven is Amazing; Generating Docs from a GitHub Wiki; Modular Shelves; Bash Best Practices; Good Emergency Gasfiter (Santiago, Chile); Readings in Recent Architecture; Roger Casement; Integrated Information Theory (Or Not); Possibly undefined macro AC_ENABLE_SHARED; Update on Charges; Sunburst Visualisation; Spectral Embeddings (Distances -> Coordinates); Introduction to Causality; Filtering To Help Colour-Blindness; ASUS 1015E-DS02 Too; Ready Player One; Writing Clear, Fast Julia Code; List of LatAm Novels; Running (for women); Building a Jenkins Plugin and a Jar (for Command Line use); Headphone Test Recordings; Causal Consistency; The Quest for Randomness; Chat Wars; Real-life Financial Co Without ACID Database...; Flexible Muscle-Based Locomotion for Bipedal Creatures; SQL Performance Explained; The Little Manual of API Design; Multiple Word Sizes; CRC - Next Steps; FizzBuzz; Update on CRCs; Decent Links / Discussion Community; Automated Reasoning About LLVM Optimizations and Undefined Behavior; A Painless Guide To CRC Error Detection Algorithms; Tests in Julia; Dave Eggers: what's so funny about peace, love and Starship?; Cello - High Level C Programming; autoreconf needs tar; Will Self Goes To Heathrow; Top 5 BioInformatics Papers; Vasovagal Response; Good Food in Vina; Chilean Drug Criminals Use Subsitution Cipher; Adrenaline; Stiglitz on the Impact of Technology; Why Not; How I Am 5; Lenovo X240 OpenSuse 13.1; NSA and GCHQ - Psychological Trolls; Finite Fields in Julia (Defining Your Own Number Type); Julian Assange; Starting Qemu on OpenSuse; Noisy GAs/TMs; Venezuela; Reinstalling GRUB with EFI; Instructions For Disabling KDE Indexing; Evolving Speakers; Changing Salt Size in Simple Crypt 3.0.0; Logarithmic Map (Moved)

© 2006-2013 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
http://allmydata.org/trac/tahoe/browser/docs/known_issues.txt

There's a page here that discusses possible uses for such a system -
http://allmydata.org/trac/tahoe/wiki/UseCases

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
http://allmydata.org/~warner/pycon-tahoe.html

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 -
http://www.killerstartups.com/Web-App-Tools/allmydata-com-online-storage-backup
)

Andrew

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)

http://testgrid.allmydata.org:3567/uri/URI:DIR2-RO:j74uhg25nwdpjpacl6rkat2yhm:kav7ijeft5h7r7rxdp5bgtlt3viv32yabqajkrdykozia5544jqa/wiki.html

(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!)

Andrew

OFF

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
things

http://offsystem.sourceforge.net/

Cheers,
Francesco

Re: OFF

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

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

Hi,

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),
Andrew

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