NDLI: Ace: an efficient key-exchange protocol for onion routing

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Ace: an efficient key-exchange protocol for onion routing

Content Provider	ACM Digital Library
Author	Kate, Aniket Mohammadi, Esfandiar Backes, Michael
Abstract	The onion routing (OR) network Tor provides privacy to Internet users by facilitating anonymous web browsing. It achieves anonymity by routing encrypted traffic across a few routers, where the required encryption keys are established using a key exchange protocol. Goldberg, Stebila and Ustaoglu recently characterized the security and privacy properties required by the key exchange protocol used in the OR network. They defined the concept of one-way authenticated key exchange (1W-AKE) and presented a provably secure 1W-AKE protocol called ntor, which is under consideration for deployment in Tor. In this paper, we present a novel 1W-AKE protocol Ace that improves on the computation costs of ntor: in numbers, the client has an efficiency improvement of 46% and the server of nearly 19%. As far as communication costs are concerned, our protocol requires a client to send one additional group element to a server, compared to the ntor protocol. However, an additional group element easily fits into the 512 bytes fix-sized Tor packets (or cell) in the elliptic curve cryptography (ECC) setting. Consequently, our protocol does not produce a communication overhead in the Tor protocol. Moreover, we prove that our protocol Ace constitutes a 1W-AKE. Given that the ECC setting is under consideration for the Tor system, the improved computational efficiency, and the proven security properties make our 1W-AKE an ideal candidate for use in the Tor protocol.
Starting Page	55
Ending Page	64
Page Count	10
File Format	PDF
ISBN	9781450316637
DOI	10.1145/2381966.2381974
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-10-15
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Onion routing Authenticated key agreement Tor Circuit construction One-way anonymity
Content Type	Text
Resource Type	Article

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