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Using browser properties for fingerprinting. Ralph broenink. User tracking. Alert Drunk terrorist going to put a bomb in a teddy bear. ‘traditional’ cookies. Flash Local Shared Objects. HTTP Cookies. HTML5 Local Storage. ‘Traditional’ cookies. 3u938s24. 3u938s24.

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Presentation Transcript
slide2
User tracking

Alert

Drunk terrorist goingto put a bomb in a teddy bear

slide3
‘traditional’ cookies

Flash

Local Shared Objects

HTTP

Cookies

HTML5

Local Storage

slide4
‘Traditional’ cookies

3u938s24

3u938s24

3u938s24

3u938s24

slide5

“Anyonewho[…] wants to save data in the peripherals of the user, is requiredto […] have obtainedpermissionfrom the user.”

– article 11.7a, Telecommunicatiewet (translated)

Isn’tthere a new lawagainstit?

slide6
Yeah, but ...

Host: www.letmetrackyou.org Connection: keep-alive Cache-Control: max-age=0 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64)

AppleWebKit/535.18 (KHTML, like Gecko)

Chrome/18.0.1010.1 Safari/535.18 Accept: text/html,application/xhtml+xml,

application/xml;q=0.9,*/*;q=0.8 Accept-Encoding:gzip,deflate,sdchAccept-Language:en-GB,en;q=0.8,

en-US;q=0.6,nl;q=0.4Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 

name

version

language

character set

screen resolution

operating system

timezone

font list

+ order

HTTP HEADERS

JAVASCRIPT

slide7

identical (consistent)?

unique?

Character set: UTF-8

Resolution: 1280x768

Language: Dutch

OS: Windows 7 64-bit

Plugins: Flash 10.1, …

Fonts: Arial, …

slide9
Are fingerprintsunique?

>8.47 bits of entropy

(of 8.95 possible)

slide10
Are fingerprints consistent?

Arial Black

Calibri

Candara

Comic Sans MS

Consolas

Constantia

Browser version:

4.0.1

5.0.0

5.0.1

4.0.0

5.0.2

4.1.0

4.0.2

6.0.0

Segoe UI

Corbel

Franklin Gothic Medium

Gabriola

Georgia

Palatino Linotype

Segoe Print

Trebuchet MS

slide11
Are fingerprints consistent?

They are fairly consistent.

slide12
Mobile devices

X-VF-ACR

X-Brand-ID

slide13
Whatcanyou do?

private browsing

mode

Tor Browser