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  • How to implement RSA-CBC?(I have uploaded the request document)

    - by tq0fqeu
    I don't konw more about cipher, I just want to implement RSA-CBC which maybe mean that the result of RSA encrypt in CBC mode, and I have implemented RSA. any code languages will be ok, java will be appreciated thx I copy the request as follow(maybe has spelling wrong), but that's French I don't konw that: Pr´esentation du mini-projet Le but du mini-projet est d’impl´ementer une version ´el´ementaire du chi?rement d’un bloc par RSA et d’inclure cette primitive dans un systeme de chi?rement par bloc avec chaˆinage de blocs et IV (Initial Vector ) al´eatoire. Dans ce systeme, un texte clair (`a chi?rer) est d´ecompos´e en blocs de taille t (?x´ee par l’utilisa- teur), chaque bloc (clair) est chi?r´e par RSA en un bloc crypt´e de mˆeme taille, puis le cryptogramme associ´e au texte clair initial est obtenu en chaˆinant les blocs crypt´es par la m´ethode CBC (cipher- block chaining) d´ecrite dans le cours (voir poly “Block Ciphers”) Votre programme devra demander a l’utilisateur la taille t, puis, apres g´en´eration des cl´es publique et priv´ee, lui proposer de chi?rer ou d´echi?rer un (court) ?chier ASCII. Il est indispensable que votre programme soit au moins capable de traiter le cas (tres peu r´ealiste du point de vue de la s´ecurit´e) t = 32. Pour les traiter des blocs plus grands, il vous faudra impl´ementer des routines d’arithm´etique multi-pr´ecision ; pour cela, je vous conseille de faire appela des bibliotheques libres comme GMP (GNU Multiprecision Library). Pour la g´en´eration al´eatoire des nombres premiers p et q, vous pouvez ´egalement faire appela des bibliotheques sp´ecialis´ees,a condition de me donner toutes les pr´ecisions n´ecessaires. Vous devez m’envoyer (avant une date qui reste a ?xer)a mon adresse ´electronique ([email protected]) un courriel (sujet : [MI1-crypto] : devoir, corps du message : les noms des ´etudiants ayant travaill´e sur le mini-projet) auquel sera attach´e un dossier compress´e regroupant vos sources C ou Java comment´ees, votre programme ex´ecutable, et un ?chier texte ou PDF donnant toutes les pr´ecisions sur les biblioth`eques utilis´ees, vos choix algorithmiques et d’impl´ementation, et les raisons de ces choix (complexit´e algorithmique, robus- tesse, facilit´e d’impl´ementation, etc.). Vous pouvez travailler en binˆome ou en trinˆome, mais je serai nettement plus exigeant avec les trinˆomes I have uploaded the request at http://uploading.com/files/22emmm6b/enonce_projet.pdf/ thx

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  • Command line options in Filezilla.

    - by Quintin Par
    How do I invoke Filezilla from the command line to upload the contents of a directory? I would also like to set parameters like overwrite all etc. From help page all I see is options for opening Filezilla with specific server etc, but not to upload...

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  • collectd:Monitoring server not showing clients

    - by Quintin Par
    I have setup a monitoring server with the following setup. <Plugin network> Listen "0.0.0.0" "25826" </Plugin> Now my clients are sending data to the monitoring server(verified through tcpdump). Even the collection folder shows that the data is being dumped /var/lib/collectd/rrd [ec2-user at x rrd]$ ll total 4 drwxr-xr-x 11 root root 4096 Nov 20 17:53 x-web-1.y.com [ec2-user at x rrd]$ I have also verified with find . -mmin 1 to see if its being constantly updated. [ec2-user@x rrd]$ find . -mmin 1 ./x-web-1.y.com/interface-eth0/if_errors.rrd ./x-web-1.y.com/interface-eth0/if_packets.rrd ./x-web-1.y.com/interface-eth0/if_octets.rrd ./x-web-1.y.com/disk-xvda1/disk_time.rrd ./x-web-1.y.com/disk-xvda1/disk_ops.rrd ./x-web-1.y.com/disk-xvda1/disk_octets.rrd ./x-web-1.y.com/disk-xvda1/disk_merged.rrd But when i look it up through collectd-web, I don't see the clients What might be wrong in my setup?

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  • Downloading movies with Bit torrent

    - by Quintin Par
    I come from a part of the world where the average Hollywood movie is released a year + later than in US. For example: Transformers: Revenge of the Fallen will be released only 5-6 months down the lane. The Reader, I think will not be released at all. Is this a right justification for me to download movies from the torrent networks and watch them? Even if I don’t share it? P.S I don’t think my country has all these American type cyber laws to catch me. It’s just the guilt feeling. Note: SuperUser is not a legal resource.

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  • Nginx & Lua: Hacks, optimizations & observations

    - by Quintin Par
    Following this post on using Lua to increase nginx’s flexibility and in reducing load on the web stack I am curious to know how people are using Lua to enhance nginx’s capability. Are there any notable hacks, optimizations & observations using Lua? Hacks that people have used to discover capability with Nginx that would otherwise be complicated/impossible with a webserver or reverse proxy? Edit: Links: http://thechangelog.com/post/3249294699/super-nginx-killer-build-of-nginx-build-for-luajit-plus http://skillsmatter.com/podcast/home/scripting-nginx-with-lua/te-4729 http://devblog.mixlr.com/2012/06/26/how-we-use-nginx-lua-and-redis-to-beta-ify-mixlr/

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  • Buffer requests in nginx while a symlink switches on backend

    - by Quintin Par
    In a release deployment I would like to buffer client requests that come to nginx(in reverse proxy) mode to be buffered for possibily 1-2 seconds while a pdsh request is sent to switch symlinks on the back end server to /var/www/html/current . After the switch is complete, I would want to release the buffering while avoiding a herd clash. Is this possible in nginx? Can someone help? Edit: The idea is not to loose requests and from nginx forums I've come to know that retries can sometimes results in CPU spins

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  • Android return to the original position of the view after MotionEvent

    - by Kurty
    My application currently changes to another random int (View) when I let go of it (ACTION_UP) but the view stays in the same spot where I dropped it. I want it to return to the original location (the middle of the screen) when I drop it so I can repeat the process. // OnTouch and MotionEvent OnTouchListener dragt = new OnTouchListener() { public boolean onTouch(View v, MotionEvent me) { FrameLayout.LayoutParams par = (FrameLayout.LayoutParams) v.getLayoutParams(); switch (v.getId()) { case R.id.randomView: } switch(me.getAction()) { case MotionEvent.ACTION_MOVE: par.gravity = 0; par.setMargins((int)me.getRawX() - (v.getWidth())/2, (int)me.getRawY() - (v.getHeight())/2, 0, 0); v.setLayoutParams(par); break; case MotionEvent.ACTION_UP: // tallies score. score++; textScore.setText(String.valueOf(score)); // this generates the new view but the location is still the same color.setImageResource(mImageIds[rgenerator.nextInt(mImageIds.length)]); break; } return true; } };

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  • Most precise way to calculate server response time.

    - by Quintin Par
    What's the most precise way to calculate the time taken by my server to execute a HTTP request. I don’t want to know the DNS resolution or the traceroute time, but just the server execution time. The is a follow up to my previous question to detect whats causing the delay between entering a domain name and load of the page

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  • Nginx: bug using if in location, how do I rectify

    - by Quintin Par
    I am using nginx in reverse proxy mode. In my server section I have this code to set expire and cache control of my static files. location ~* ^.+\.(css|js|png|gif)$ { access_log off; expires max; add_header Cache-Control public; if (!-f $request_filename) { proxy_pass http://localhost:82; } } This is quite obviously creating issues. Can someone help me correct this code to use try_files or rewrite?

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  • How can I optimize my ajax calls to deliver at 60ms.

    - by Quintin Par
    I am building an autocomplete functionality for my site and the Google instant results are my benchmark. When I look at Google, the 50-60 ms response time baffle me. They look insane. In comparison here’s how mine looks like. To give you an idea my results are cached on the load balancer and served from a machine that has httpd slowstart and initcwnd fixed. My site is also behind cloudflare From a server side perspective I don’t think I can do anything more. Can someone help me take this 500 ms response time to 60ms? What more should I be doing to achieve Google level performance? Edit: People, you seemed to be angry that I did a comparison to Google and the question is very generic. Sorry about that. To rephrase: How can I bring down response time from 500 ms to 60 ms provided my server response time is just a fraction of ms. Assume the results are served from Nginx - Varnish with a cache hit. Here are some answers I would like to answer myself assume the response sizes remained more or less the same. Ensure results are http compressed Ensure SPDY if you are on https Ensure you have initcwnd set to 10 and disable slow start on linux machines. Etc. I don’t think I’ll end up with 60 ms at Google level but your collective expertise can help easily shave off a 100 ms and that’s a big win.

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  • Use puppet to make changes to ip route and sysctl

    - by Quintin Par
    I have two changes to ip route & sysctl that disable tcp slow start. Here’s how I do it ip route show Make a note of the line starting with default. Pick up the IP from the default line and run sudo ip route change default via $ip_address dev eth0 initcwnd 12 sudo sysctl -w net.ipv4.tcp_slow_start_after_idle=0 How can I create a puppet script out of this? One that can be deployed to many machines of the same type – CentOS 6 Edit: Added bounty to get a working example for sudo ip route change default via $ip_address dev eth0 initcwnd 12

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  • “BAD” partition showing up in Partition Manager

    - by Quintin Par
    I tried to partition my primary hard disk (NTFS partitions) with qtparted and got stuck in the process. Consequently I had to kill the process and exit my knoppix live CD boot up. Even though I was expecting XP to get corrupted, it booted fine and showed up all the drives accessible. But when I opened this with partition manager 8, it shows up as “BAD”. I ran chkdsk /f without any success. My objective with qparted and partition magic was to resize my existing partitions and add some space to c: How do I fix this problem and resize my partitions? Edit: Here's how my primary drive as per Windows is:

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  • How does Google manage to serve results so fast?

    - by Quintin Par
    I am building an autocomplete functionality for my site and the Google instant results are my benchmark. When I look at Google, the 50-60 ms response time baffle me. They look insane. In comparison here’s how mine looks like. To give you an idea my results are cached on the load balancer and served from a machine that has httpd slowstart and initcwnd fixed. My site is also behind cloudflare From a server side perspective I don’t think I can do anything more. Can someone help me take this 500 ms response time to 60ms? What more should I be doing to achieve Google level performance?

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  • La version gratuite de Visual Studio 2010 est disponible, Visual Studio 2010 Express introduit des o

    Visual Studio 2010 Express est disponible La version gratuite de Visual Studio 2010 propose à présent des outils de développement pour Windows Phone 7 Alors que Visual Studio 2010 débarque avec ses nouveautés (lire par ailleurs ici), sa version gratuite Visual Studio Express 2010 vient d'être mis à la disposition des développeurs sur le site officiel de Microsoft. Cette version présente des fonctionnalités certes limitées par rapport à la version complète (elle est prévue...

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  • Le C en 20 heures d'Eric Berthomier et Daniel Schang

    Nous avons le plaisir de vous présenter le livre "Le C en 20 heures" d'Eric Berthomier et Daniel Schang à consulter ou à télécharger gratuitement. Citation: L'ouvrage que vous tenez dans les mains ou que vous consultez sur votre écran a pour objectif de vous faire découvrir, par la pratique, la programmation en langage C. Il a été testé par de nombreux étudiants qui n'avaient aucune connaissance préalable de ce langage. En 20 à 30 heures de ...

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  • « Le TDD est mort » pour le créateur de Ruby on rails, une position qui divise la communauté agile

    Le TDD est mort ? Non, pas vraiment, peut-être que oui La communauté agile taraudée par un débat autour du TDD« Le TDD est mort ? Ou pas ? » Telle est la question qui taraude l'esprit de la communauté agile en ce moment, vu l'importance du TDD (Test Driven Development ? Développement piloté par les tests) dans l'une des méthodes agiles les plus réputées : la méthode XP.À l'origine de ce débat houleux, David Heinemeier Hansson (DHH) auteur de Ruby on rails et fondateur du Basecamp et ses deux posts...

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  • Un stagiaire de SAP remporte le concours du « Meilleur Développeur de France » à l'Ecole 42, Salesforce.com lui verse 10.000 Euro

    Un stagiaire de SAP remporte le concours du « Meilleur développeur de France » A l'école 42, Salesforce lui offre 10.000 eurosL'évènement a attiré du beau monde. Il faut dire que le concours du « Meilleur Développeur de France », dont la première édition a eu lieu la semaine dernière, a été particulièrement bien orchestrée par la société Going to Digital, dont un des directeurs associés est allé à bonne école en passant par une filiale de Rentabiliweb, la société de marketing numérique de l'énigmatique...

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  • TechDays 2011: un parcours dédié à Windows Embedded pour les développeurs et des démonstrations d'appareils « intelligents »

    TechDays 2011: un parcours dédié à Windows Embedded Avec des sessions développeurs et des démonstrations d'appareils « intelligents » Les TechDays 2011 vont être l'occasion de découvrir « in situ » de nombreuses technologies de Microsoft (mais pas seulement, lire par ailleurs notre dossier sur les TechDays 2011). Parmi elles, figure évidemment son nouveau système d'exploitation embarqué fondé sur Windows 7, Windows Embedded 7. Plusieurs sessions traiterons en effet des nouveautés de l'OS et de ses applications possibles. Citons par exemple « Silverlight for Windows Embedded à travers l'exemple de la H...

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