FOCA: Deeper Mining of Particular File Types

Published on February 21, 2010 in Information Security. 0 Comments Tags: , , , , .

FOCA (Fingerprinting Organizations with Collected Archives), is a free tool by informatica64 of Spain, which is intended for extracting and analyzing the hidden info of some particular file types. DEFCON 17 released a descriptive presentation called Tactical Fingerprinting using metadata, hidden info and lost data using FOCA. Audio, Slides, White Paper Here.

Some related tools, such as Libextractor/Metagoofil/OOMetaExtractor, were also referred in the slides, with solutions and useful defending tips discussed.

FOCA

Functions

  • Search for documents in Google and Bing
  • Automatic file downloading
  • Capable of extracting Metadata, hidden info and lost data
  • Cluster information
  • Analyzes the info to fingerprint the network.

Target File Types

*.doc, *.docx, *.ppt, *.pptx, *.pps, *.ppsx, *.xls, *.xlsx, *.odp, *.odt, *.ods, *.odg, *.pdf, *.wpd, *.sxw, etc.

What FOCA extract

  • Metadata: Information stored to give information about the document. (Creator, Organization, etc.)
  • Hidden information: Information internally stored by programs and not editable. (Template paths, Printers, database structure, etc.)
  • Lost data: Information which is in documents due to human mistakes or negligence, because it was not intended to be there. (Links to internal servers, data hidden by format, etc.)

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Faraway Town

Published on February 21, 2010 in Pics&Movies. 0 Comments Tags: , , , .

A very small town near Qiqihar, North China. Where I spent my spring festival in (surely and unfortunately, without Internet). Some heavy industries there but, very peaceful and quiet.

Faraway_Town_1

Faraway_Town_2

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In god we trust, or in love?

Published on February 9, 2010 in Mathematics. 0 Comments Tags: , , , , , .

You don’t have to believe in God, but you should believe in The Book.

——P. Erdos

The first half of title is contained in The Holy Bible; the latter part is related to this article. The great mathematician P.Erdos didn’t believe in god much; however, he believed there exists The Book, which may include the most concise, beautiful and elegant proofs for all the mathematical theorems. What’s more, his highest praise for a proof is:

It is from The Book!

So, I guess love has its own mathematical formulation. I plotted it with MatLab.

MATLAB_3D_heart

Original equation:

MATLAB_3D_heart_formula

MatLab source code:

?View Code SCILAB
1
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[x,y,z]=meshgrid(linspace(-3,3,120));
f=(x.^2+(9*y.^2)./4+z.^2-1).^3-((9*y.^2).*(z.^3))./80-(x.^2).*(z.^3);
p=patch(isosurface(x,y,z,f,0));
set(p, 'FaceColor', 'r', 'EdgeColor', 'n');
daspect([1 1 1]);view(3);camlight('right');lighting phong

Even though some great people like P.Erdos have passed away, their thought will last eternally.

Spring Festival Eve

Snowing Night, Harbin