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Paper Abstract and Keywords
Presentation 2014-01-24 14:55
An Evaluation of Node-Based Delays in Tor Network
Kale Timothy Girry, Satoshi Ohzahata, Celimuge Wu, Toshihiko Kato (Univ. of Electro-Comm.) IN2013-138
Abstract (in Japanese) (See Japanese page) 
(in English) The Tor Network is a low-latency anonymity and censorship resistance network, which relaying traffics through onion routers before being forwarded to the destination. The distribution of trust offered by Tor creates resilience in the face of compromise and censorship; however, there are performance and usability issues in the Tor network. In this paper, we analyze in more details the delay contributions from different components that cause delays in the Tor nodes. We measured the application packet that passes through all the relay nodes and closely compute the sources of latency. The experimental analysis shows that the delays occurring on relay nodes are caused by the heavy circuit queuing, TCP kernel memory exhaustion and TCP advertised window not able to accept more data. We present our experimental detail analysis and measurement results as a prerequisite for addressing the Tor?s poor performance and usability.
Keyword (in Japanese) (See Japanese page) 
(in English) Node Based Delay / Queuing Delay / TCP Buffers / Node CPU / Kernel Memory Usage / TCP Window Sizes / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 389, IN2013-138, pp. 121-126, Jan. 2014.
Paper # IN2013-138 
Date of Issue 2014-01-16 (IN) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF IN2013-138

Conference Information
Committee IN NWS  
Conference Date 2014-01-23 - 2014-01-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya International Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network Software, Contents Delivery/Contents Exchange, Social Networking Service (SNS), Data Analysis/Processing Platform, Big Data, etc. 
Paper Information
Registration To IN 
Conference Code 2014-01-IN-NWS 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An Evaluation of Node-Based Delays in Tor Network 
Sub Title (in English)  
Keyword(1) Node Based Delay  
Keyword(2) Queuing Delay  
Keyword(3) TCP Buffers  
Keyword(4) Node CPU  
Keyword(5) Kernel Memory Usage  
Keyword(6) TCP Window Sizes  
Keyword(7)  
Keyword(8)  
1st Author's Name Kale Timothy Girry  
1st Author's Affiliation University of Electro-Communications (Univ. of Electro-Comm.)
2nd Author's Name Satoshi Ohzahata  
2nd Author's Affiliation University of Electro-Communications (Univ. of Electro-Comm.)
3rd Author's Name Celimuge Wu  
3rd Author's Affiliation University of Electro-Communications (Univ. of Electro-Comm.)
4th Author's Name Toshihiko Kato  
4th Author's Affiliation University of Electro-Communications (Univ. of Electro-Comm.)
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Speaker Author-1 
Date Time 2014-01-24 14:55:00 
Presentation Time 25 minutes 
Registration for IN 
Paper # IN2013-138 
Volume (vol) vol.113 
Number (no) no.389 
Page pp.121-126 
#Pages 6 
Date of Issue 2014-01-16 (IN) 

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