Safe Browsing at SIIT.

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Presentation transcript:

Safe Browsing at SIIT

the Internet Explain web browsing and Internet structure Here is the web page containing your news feeds Response http://www.facebook.com/ Send me the web page of my news feeds the Internet Request wsiit Explain web browsing and Internet structure You - WiFi AP - Internet - Server Send request for web page Receive web page in response

the Internet Another example of web browsing, this time with login Login as 5722123456 with mysEcretpassw0rd the Internet Request wsiit Another example of web browsing, this time with login Response Here is the web page for registration

Can someone else see the web pages you are visiting?

the Internet wsiit Demo of wireless packet capture

Request Request Response Response

When using WiFi, assume everyone nearby can “see” everything you do on the Internet the websites you visit: www.YouShouldNotBeHere.com the information on web pages: Account balance = 1,000,000,000 Baht the comments you post: Dr Steve is the worst lecturer ever! the passwords you submit: 5722123456, mysEcretpassw0rd

unless you use encryption When using WiFi, assume everyone nearby can “see” everything you do on the Internet unless you use encryption WiFi Encryption: WPA Web Browsing Encryption: https

Encryption changes the message so that only those with the same key can read it Encrypt with key Request a6i#l)P1 a6i#l)P1 9G<3t_da; 9G<3t_da; Decrypt with key Response

Use HTTPS when accessing “important” websites Use WPA in your own WiFi network

Man-in-the-Middle Attack on HTTPS Facebook thinks I am you You think I am Facebook fake_wsiit Facebook gives “you” ( ) the key You receive the key from “Facebook” ( ) Everything encrypted with the key can be decrypted by attacker ( )

Beware of security warnings! Especially for websites that don't normally give a warning

Use your powers for good Safe Browsing with WiFi Assume everyone can see what you are doing Use HTTPS when accessing “important” websites Use WPA in your own WiFi network Beware of security warnings when using HTTPS Use your powers for good Bi Sam Dana Steve Linux mitmproxy