Computer security: certificationHow confidential is traffic in this lecture room?Example Data inside packetURLs are visible in Referer and in the GET commandAuxiliary Material for LectureResearch into Video Streaming for DP2?GMail is not encrypted by defaultIChat is PlaintextSlide 9Authentication logic (p 11-83)ExampleSlide 12Computer security: certificationFrans Kaashoek6.033 Spring 2007How confidential is traffic inthis lecture room?•sudo tcpdump -s 0 -Ai en1–Complete trace of all packets on wirelessc3d4•c3d4 a1b2 0002 0004 0000 0000–You shouldn’t do this•Example:13:57:53.794429 IP 18.188.69.36.mdns > 224.0.0.251.mdns: 0 [4a] [4q] SRV? Ben’s music._daap._tcp.local. TXT? Ben’s music._daap._tcp.local. A? ben-powerbook-g4-15.local. AAAA? ben-powerbook-g4-15.local. (367)Example Data inside packetGET /tracking/tracking.cgi?tracknum=1Z1836810375022812 HTTP/1.1Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shock wave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application /msword, */*Accept-Language: en-usAccept-Encoding: gzip, deflateUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.1)Host: wwwapps.ups.comConnection: Keep-AliveURLs are visible in Referer and in the GET commandAuxiliary Material for LectureResearch into Video Streaming for DP2?GMail is not encrypted by default•Passed in the clear:–Contacts lists–GCalendar events•GZipped text–Inbox entries–Mail messages["112677a23fed4887",0,0,"12:58 pm","\u003cspan id\u003d\"_upro_rms@ gnu.org\"\>Richard Stallman\u003c/span\>"," ","[csail-related] Thwart big brother--trade charlie cards. 13:45 Tuesday at rm 381","I have a charlie card with zero value currently stored on on it which I used for a couple of …",[],"","112677a23fed4887",0,"Mon May 7 2007_12:58 PM",0,"",0,0,1] Hint: Change the GMail URL to https:// !IChat is Plaintext•strings log.dump | grep ichatballoon | cut -d\> -f 4- A: it's just better not to reveal personal informationB: why?A: I dunno, identity theft and stuffB: oh, okayA: maybe I just won't worry about itAuthentication logic (p 11-83)•1. Delegation of authority:–If A says (B speaks for A) B speaks for A•2. Use of delegated authority:–If B speaks for A and B says (A says X) A says X•3. Chaining of delegation–If B speaks for A and A speaks for C B speaks for CExample0. {A: M}KAprivif verify( ..., KApub) accepts then:1. KApriv says A says Mif KApriv speaks for KApub, apply rule 3:•KApub says A says Mif KApub speaks for A, apply rule 2:1. A says Mdoes KApub speak for A?1. {KApub speaks for A}KMITprivif verifies with KMITpub2. KMITpriv says KApub speaks for Aif KMITpriv speaks for KMITpub3. KMITpub says KApub speaks for Aif KMITpub speaks for MIT4. MIT says KApub speaks for Aif MIT speaks for A5. KApub speaks for
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