Archive for the ‘Science’ Category

Kerckhoffs’s principle

November 2nd, 2015 No comments

“The security of a cryptosystem should depend solely on the secrecy of the key and the private randomizer, not of the secrecy of the used cryptographic algorithm.”


“Un grand nombre de combinaisons ingénieuses peuvent répondre au but qu’on veut atteindre dans le premier cas ; dans le second, il faut un système remplissant certaines conditions exceptionnelles, conditions que je résumerai sous les six chefs suivants:

1° Le système doit être matériellement, sinon mathématiquement, indéchiffrable

2° Il faut qu’il n’exige pas le secret, et qu’il puisse sans inconvénient tomber entre les mains de l’ennemi

3° La clef doit pouvoir en être communiquée et retenue sans le secours de notes écrites, et être changée ou modifiée au gré des correspondants

4° Il faut qu’il soit applicable à la correspondance télégraphique

5° Il faut qu’il soit portatif, et que son maniement ou son fonctionnement n’exige pas le concours de plusieurs personnes

6° Enfin, il est nécessaire, vu les circonstances qui en commandent l’application, que le système soit d’un usage facile, ne demandant ni tension d’esprit, ni la connaissance d’une longue série de règles à observer.

Tout le monde est d’accord pour admettre la raison d’être des trois derniers desiderata ; on ne l’est plus, lorsqu’il s’agit des trois premiers.”

ex “La cryptographie militaire” Auguste Kerckhoffs, janvier 1883

Categories: Science, Technology Tags:

The most powerful tool

October 13th, 2015 No comments

“The most powerful tool is your mind!”

Categories: Art, Science Tags:

78 Hydroptère

August 26th, 2014 No comments

The 78 Hydroptère is currently cruising around in the lake of Zurich. – What a beauty!

Image 2014 CC-BY-NC-SA copyleft Tristan Hauser

23 years of Linux

August 25th, 2014 No comments

Congratulations, Linus Torvalds, and thanks for inventing and writing the GNU/Linux Kernel since 23(!) years!

Hello everybody out there using minix –

I’m doing a (free) operating system (just a hobby, won’t be big and
professional like gnu) for 386(486) AT clones. This has been brewing
since april, and is starting to get ready. I’d like any feedback on
things people like/dislike in minix, as my OS resembles it somewhat
(same physical layout of the file-system (due to practical reasons)
among other things).

I’ve currently ported bash(1.08) and gcc(1.40), and things seem to work.
This implies that I’ll get something practical within a few months, and
I’d like to know what features most people would want. Any suggestions
are welcome, but I won’t promise I’ll implement them :-)

Linus (torv…

PS. Yes – it’s free of any minix code, and it has a multi-threaded fs.
It is NOT protable (uses 386 task switching etc), and it probably never
will support anything other than AT-harddisks, as that’s all I have :-(.

Source: usenet comp.os.minix


January 20th, 2014 No comments

Hello World!


Hacker schedule 2014

January 6th, 2014 No comments

7. – 9. March 2014 eth-0
17. – 21. March 2014 Troopers
18. – 21. April 2014 Easterhegg
29. – 30 May 2014 HITBSecConf
13. – 15. June 2014 Chaos Singularity in Bienne
19. – 22. June 2014 Gulasch Programmier Nacht
July 2014 SIGINT
August 2014 ICMP7
September 2014 Datenspuren
24. – 26. October 2014 Hackover
27. – 30. December 2014 31C3


July 18th, 2013 No comments

Aus der Reihe “dem Philosoph ist nichts zu doof”:

„Beim Erwachen hatte ich schon so viele Einfälle, dass der Tag nicht ausreichte, um sie niederzuschreiben.“

Zitat Gottfried Wilhelm Leibniz

… drum bleib’ ich heute im Bett um gar nicht erst der Welt Schaden anzurichten.

Categories: Culture, Science Tags:

The astrophysical perversion of copyright infringement

February 17th, 2013 No comments

The german GEMA, – which ought to represent “intellectual property” as an institution, – today blocked several youtube clips of the meteorite shower that arised over Russia yesterday, within Germany. – Apparenty GEMA tries to enforce God’s creation on a copyright & “intellectual property” level! – Please, – therefore, – find the according youtube clips for free (as in free beer) download hereby:

direct download: ogv webm mp4

direct download: ogv webm mp4

direct download: ogv webm mp4

direct download: ogv webm mp4

direct download: ogv webm mp4

direct download: ogv webm mp4

direct download: ogv webm mp4

… let’s hope the next meteor hits the GEMA head quartier!

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Categories: Culture, Human Rights, Science Tags:

Nuclear Explosion

January 31st, 2013 2 comments

Categories: Science, Technology Tags:

Suchen & Finden

April 17th, 2012 No comments

“Die Essenz des Suchens liegt in der Fragestellung.”