M ixminion: D esign of a T ype III Anonymous Remailer Prot ocol - - PowerPoint PPT Presentation

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M ixminion: D esign of a T ype III Anonymous Remailer Prot ocol - - PowerPoint PPT Presentation

Jan 13, 2024 132 likes •292 views

M ixminion: D esign of a T ype III Anonymous Remailer Prot ocol Roger D ingledine T he Free Haven Project 1 T hreat M odel ( what we aim t o defend against ) Global passive adversary can observe M ult iple Hops A E ...(E (M,to B),

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M ixminion: D esign of a T ype III Anonymous Remailer Prot ocol Roger D ingledine T he Free Haven Project

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T hreat M odel ( what we aim t o defend against )

  • Global passive adversary – can observe
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M ult iple Hops

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A B

M

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E ...(E (M,to B), to 2)

2 1 2

E ...(M,to B)

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D irect Reply

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Nymserver

NS

B A

E(E(...(M))) M,alice@nym.alias.net M, "alice"

...

N S knows A ’s reply block but not her locat ion.

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Replay cache

  • W hen a message comes in, hash it and add it t o

t he replay cache.

  • If it ’s already in t he cache, drop it .

B ut : you have t o remember all t he hashes forever!

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Expirat ion dat es

  • Exp dat e is chosen randomly between 3 days ago

and 3 days from now.

  • Each node checks exp dat e; if more t han 7 days
  • ld, drop.
  • Now adversary can’t t ell when t he message was
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