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Spying and security on the Internet

Spying and security on the Internet. Some tricks to know. Are we spied on on the internet? What kind of information on my computer can be found by other people? Why is that possible? How it works ?. Summary. 1/ Am I spied on ? 2/ IP Audit 3/ Cookies 4/ Cache memory.

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Spying and security on the Internet

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  1. Spying and security on the Internet Some tricks to know

  2. Are we spied on on the internet? • What kind of information on my computer can be found by other people? • Why is that possible? • How it works ?

  3. Summary • 1/ Am I spied on ? • 2/ IP Audit • 3/ Cookies • 4/ Cache memory

  4. AM I SPIED ON WHILE SURFING ? THAT IS THE QUESTION…

  5. -YES YOU ARE !!! -No, I can’t believe it !!

  6. -You want a demo baby ? -Yes, I do…

  7. http://www.cnil.fr/index.php?id=123 • Is that enough ? Or do you want more ?

  8. Give me your IP and I’ll tell you who you are… • http://visualtracking.symantec.com/vt_main.asp?langid=fr&go=

  9. One more time with more pieces of information… • http://www.ripe.net/whois?form_type=simple&full_query_string=&searchtext=&do_search=Search • http://www.xpenguin.com/plot.php?address= • http://www.elfqrin.com/binfo.shtml

  10. How it works ? • TCP/IP: virtual networks • Need connection and identification • Requests have pieces of information: • @ of webpage + • Information on your computer : REMOTE_HOST = REMOTE_ADDR = 160.228.152.6HTTP_USER_AGENT = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)HTTP_REFERER = http://www.cnil.fr/index.php?id=95 -a CGI (Common Gateway Interface) script analyse this data: REMOTE_HOST et REMOTE_ADDR gives your DNS and IP -HTTP_USER_AGENT gives pieces of information of your browser -HTTP_REFERER gives protocols, access-ways, pages, images etc.

  11. IP audits • Client/servers/requests • The server needs your IP to send you what you asked for • The @IP is find thanks to DNS server • DNS=Domain name->@IP • The paquets contain: 1/ @IP of the computer which sent the packet, 2/ @IP of the computer to which it is sent.

  12. Nothing hampers the computer to create a file with your @IP, your DNS, the date, the hour and the file. • You are not « aware » of this recording • It is called « audit-files » • Concerning the CNIL, they have a CGI script that gathers and analyses the audit-file of their servers

  13. C O O K I E S • What is it ? • A file on your disk • Content : Data you have once given (voluntarily or not) • Ex : a login, the number of accesses to the site, your favourite beer…

  14. C O O K I E S • How does it work ? • An instruction in the page : • Set-Cookie : Name=value; expires=date; path=chemin, domain=nom_domain; secure • Information re-sent to the server each time you visit the page • Can I block them ? • Yes… see the options of your browser

  15. C O O K I E S • Advantages • to save some useful data (Ex.: login, preferences…) • transparent use • Disadvantages • On your pc only  s.o else’s cookies… / Lost data • Content not readable • Negative use : linked to your name / e-mail address •  advertising,…

  16. CACHE MEMORY • What is it ? • Files saved • on your pc • on a proxy • Content : Files which are downloaded when you look at a page (ex: images…)

  17. CACHE MEMORY • How does it work ? • Files loaded are saved in the cache memory • When needed, the file is loaded from • the cache memory, if it is present • otherwise: downloaded •  faster • Can I block it ? • On your pc : Yes… see the options of your browser • On the proxy : No… unless you don”t use one

  18. CACHE MEMORY • Advantage • faster • Disadvantage • one can see what pages you visited

  19. Conclusion • There are plenty of ways to find data on people on the internet. There are ways to hamper them, but nobody can really surf without being able to be found…

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