martes, 24 de abril de 2007

Breaking DES, Crypto (2)

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Disclaimer: artículo sólo para frikis, y para gente con ganas de ampliar conocimientos y/o aprender curiosidades.

DES stands for Data Encryption Standard. It's a ciphering algorithm widely used for secure computer communications. It was accepted as a useful and not very demanding - in computing resources terms - cryptosystem during quite a while. Nevertheless, weaknesses were discovered, which led to development of new algorithms. An improved version of DES was issued as Triple DES, but its slowliness diminished its impact. Thus, algorithms such as AES, Twofish, IDEA, etc, were created and implemented.

For my course on Cryptography (you already knew about this if you read Multinúcleos y Crypto(1) where I wrote about Deep Crack) I've recently had to produce a little research work and prepare a presentation mainly about differential cryptoanalysis and linear cryptoanalysis. I widened the spectrum a little bit for dealing with not only cryptoanalysis attacks, but also with bruteforcing DES cryptosystem, and including a couple of semi-depth reflections about the whole thing, in the form of food for thought: real possibility of chosen plaintext attacks, practical chances of cryptoanalyzing DES, limits of brute force, etc. I titled it Breaking DES.
At the end, the presentation took a long while more than had been expected (I was supposed to talk for 30-40min and i was there for about an hour), but I think the teacher was satisfied with my work... At least, that's what I hope.
Anyway, I learned quite many things I'd like to share with anybody interested in the subject, so that's why you can access the original .ppt here (in Spanish; all content under by-nc-nd Creative Commons licence). Were you not familiarized with technical aspects of cryptography, you could still find some interest in it, since there's a bunch of good references, links and plenty of bibliography to consult included (some technical, some historical, some just divulgational).

Any feedback would be much appreciated ;-)
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5 comentarios:

Sergio Daniel Val Ruiz dijo...

De verdad que te escribiría algo pero... meda tal pereza ponerme a traducir... jaja. Un besito. ciao

Nutxo dijo...

jejejeje no e pillao ni papa de lo q has comentado jejeje sera q ami lo de la tecnonoliga mi pilla lejos i mas si esta escrito en ingles juju
Por cierto q ya esta todo claro con el libro en polako i don't worry about the money ;)

BarakKhazad dijo...

juas! XD
en inglés está el artículo, pero la presentación en .ppt está en castellanoooooo!

bieeeen! :-) Principito en polacoooo ^_^

Creu dijo...

Lo siento Mister, no hablo ingles...
Por cierto con respecto a tu anterior texto, no hay ningun mes en el cual nazca una mayor cantidad de gente... te buscaria enlaces sobre los estudios de demografia pero ando un poco vago antes de cenar.

BarakKhazad dijo...

anda q no, Creu, nen! XD todo el mundo fo... ...rnica más en verano... con lo que nueves meses después, es decir, entre marzo y mayo, es cuando más nacimientos y luego aniversarios hay... ^^ por eso abril es tan cumplestresante ^^

leches, que la presentación está en castellano y me la curré mucho XD está en el penúltimo enlace, donde dice "original .ppt here"...

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