Improving Efficiency and Simplicity of Tor Circuit Establishment and Hidden Services

Autor:	Lasse Øverlier, Paul Syverson
Rok vydání:	2007
Předmět:	Network architecture Forward secrecy Computer science business.industry Distributed computing Rendezvous Overhead (computing) Routing (electronic design automation) Encryption business Communications protocol Protocol (object-oriented programming)
Zdroj:	Privacy Enhancing Technologies ISBN: 9783540755500 Privacy Enhancing Technologies
DOI:	10.1007/978-3-540-75551-7_9
Popis:	In this paper we demonstrate how to reduce the overhead and delay of circuit establishment in the Tor anonymizing network by using predistributed Diffie-Hellman values. We eliminate the use of RSA encryption and decryption from circuit setup, and we reduce the number of DH exponentiations vs. the current Tor circuit setup protocol while maintaining immediate forward secrecy. We also describe savings that can be obtained by precomputing during idle cycles values that can be determined before the protocol starts. We introduce the distinction of eventual vs. immediate forward secrecy and present protocols that illustrate the distinction. These protocols are even more efficient in communication and computation than the one we primarily propose, but they provide only eventual forward secrecy. We describe how to reduce the overhead and the complexity of hidden server connections by using our DH-values to implement valet nodes and eliminate the need for rendezvous points as they exist today. We also discuss the security of the new elements and an analysis of efficiency improvements.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::08511f7da4adeec4c0c890b92e37b42a https://doi.org/10.1007/978-3-540-75551-7_9 Zobrazit plný text záznamu