cs-438 decentralized systems engineering week 11
TRANSCRIPT
CS-438Decentralized Systems Engineering
Week 11
Anonymous Communication
Motivations- political dissidents (in
authoritarian regime)- isolate work & personal- protect freedoms of speech, association- voting : ballots are anonymous
- hide criminal activity from law enforcement
Approaches :
-
"Natural" anonymity :
"feel"
of anonymity
IIP addresses, phone numbers . .
..
ADELE,boob
Proxies,
Virtual Private Network crew)#ftp.#.Lo*I&3ob
weakness : proxy is a centralized,trusted party
- Multi - hop relaying : MIX -nets,
Tor,(onion routing)*dice! if
(David Chuang- Dining Cryptographers CDC -nets) : into.ie?nagfonAiigg:o!!-#edoBob
Relayingapproaehes-MIX - nets ( charm) : high - latency, delay - tolerant messagesffljceemzytxnemailerr
( USENET,Email)
email On'
Bob - low trust in each Mex
do post to- traffic analysis resistance
AT 99 Usenet group - batching, delaysINSA) - low usability (non - interactive- Onion routing (Tor)
:'low - latency, interactive (web)
Swisscom swigs.com
aol.ie#:*.i*oB..:::in:::ieir....:::.!:rs0 Server analysiscorrelation Chyna! genies
④'
vantage points)
Information coding: Dining cryptographers (DC - nets)- is
O ' O -parallel instances
÷÷÷÷÷i÷÷÷÷÷÷÷:÷:÷. .in: ÷:÷:::÷÷..- Ir e)form different
groups,O see whichgroups
" work"
O O - intersection attack
servers(trustees-
"
trap " or"blame " mechanisms
'd 8 O' ( "any trust"- Mahonymous scheduling
±
'its '%:&.fi - zero -knowledge proofs verdict)oooo oooo co
- Security : want all-to -all coin sharing- ⑧ In ') - less scalableeagle twitter trustees84979 Low-latency e o
o- promise : low - latency DC -nets ?
owPNrde## - Pnifi ( kudovic Barmanet.ae/)relatqqqcow-late#e④ Clients thighAnonymity set latency