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PryTag.html
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<!DOCTYPE html>
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>PryTag</title>
<meta name="viewport" content="width=device-width">
<meta name="description" content="Open Source Private Information Retrieval datastore">
<link rel="canonical" href=".">
<script type="text/x-mathjax-config"> MathJax.Hub.Config({tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}});
</script>
<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
</script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
</script>
<link rel="stylesheet" href="./PryTag_files/main.css">
<style type="text/css">.MathJax_Hover_Frame {border-radius: .25em; -webkit-border-radius: .25em; -moz-border-radius: .25em; -khtml-border-radius: .25em; box-shadow: 0px 0px 15px #83A; -webkit-box-shadow: 0px 0px 15px #83A; -moz-box-shadow: 0px 0px 15px #83A; -khtml-box-shadow: 0px 0px 15px #83A; border: 1px solid #A6D ! important; display: inline-block; position: absolute}
.MathJax_Hover_Arrow {position: absolute; width: 15px; height: 11px; cursor: pointer}
</style><style type="text/css">#MathJax_About {position: fixed; left: 50%; width: auto; text-align: center; border: 3px outset; padding: 1em 2em; background-color: #DDDDDD; color: black; cursor: default; font-family: message-box; font-size: 120%; font-style: normal; text-indent: 0; text-transform: none; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; z-index: 201; border-radius: 15px; -webkit-border-radius: 15px; -moz-border-radius: 15px; -khtml-border-radius: 15px; box-shadow: 0px 10px 20px #808080; -webkit-box-shadow: 0px 10px 20px #808080; -moz-box-shadow: 0px 10px 20px #808080; -khtml-box-shadow: 0px 10px 20px #808080; filter: progid:DXImageTransform.Microsoft.dropshadow(OffX=2, OffY=2, Color='gray', Positive='true')}
.MathJax_Menu {position: absolute; background-color: white; color: black; width: auto; padding: 2px; border: 1px solid #CCCCCC; margin: 0; cursor: default; font: menu; text-align: left; text-indent: 0; text-transform: none; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; z-index: 201; box-shadow: 0px 10px 20px #808080; -webkit-box-shadow: 0px 10px 20px #808080; -moz-box-shadow: 0px 10px 20px #808080; -khtml-box-shadow: 0px 10px 20px #808080; filter: progid:DXImageTransform.Microsoft.dropshadow(OffX=2, OffY=2, Color='gray', Positive='true')}
.MathJax_MenuItem {padding: 2px 2em; background: transparent}
.MathJax_MenuArrow {position: absolute; right: .5em; color: #666666}
.MathJax_MenuActive .MathJax_MenuArrow {color: white}
.MathJax_MenuArrow.RTL {left: .5em; right: auto}
.MathJax_MenuCheck {position: absolute; left: .7em}
.MathJax_MenuCheck.RTL {right: .7em; left: auto}
.MathJax_MenuRadioCheck {position: absolute; left: 1em}
.MathJax_MenuRadioCheck.RTL {right: 1em; left: auto}
.MathJax_MenuLabel {padding: 2px 2em 4px 1.33em; font-style: italic}
.MathJax_MenuRule {border-top: 1px solid #CCCCCC; margin: 4px 1px 0px}
.MathJax_MenuDisabled {color: GrayText}
.MathJax_MenuActive {background-color: Highlight; color: HighlightText}
.MathJax_Menu_Close {position: absolute; width: 31px; height: 31px; top: -15px; left: -15px}
</style><style type="text/css">#MathJax_Zoom {position: absolute; background-color: #F0F0F0; overflow: auto; display: block; z-index: 301; padding: .5em; border: 1px solid black; margin: 0; font-weight: normal; font-style: normal; text-align: left; text-indent: 0; text-transform: none; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; box-shadow: 5px 5px 15px #AAAAAA; -webkit-box-shadow: 5px 5px 15px #AAAAAA; -moz-box-shadow: 5px 5px 15px #AAAAAA; -khtml-box-shadow: 5px 5px 15px #AAAAAA; filter: progid:DXImageTransform.Microsoft.dropshadow(OffX=2, OffY=2, Color='gray', Positive='true')}
#MathJax_ZoomOverlay {position: absolute; left: 0; top: 0; z-index: 300; display: inline-block; width: 100%; height: 100%; border: 0; padding: 0; margin: 0; background-color: white; opacity: 0; filter: alpha(opacity=0)}
#MathJax_ZoomFrame {position: relative; display: inline-block; height: 0; width: 0}
#MathJax_ZoomEventTrap {position: absolute; left: 0; top: 0; z-index: 302; display: inline-block; border: 0; padding: 0; margin: 0; background-color: white; opacity: 0; filter: alpha(opacity=0)}
</style><style type="text/css">.MathJax_Preview {color: #888}
#MathJax_Message {position: fixed; left: 1em; bottom: 1.5em; background-color: #E6E6E6; border: 1px solid #959595; margin: 0px; padding: 2px 8px; z-index: 102; color: black; font-size: 80%; width: auto; white-space: nowrap}
#MathJax_MSIE_Frame {position: absolute; top: 0; left: 0; width: 0px; z-index: 101; border: 0px; margin: 0px; padding: 0px}
.MathJax_Error {color: #CC0000; font-style: italic}
</style><style>.lookupUJPFKV, .lookupforemostUJPFKV, .lookupdockedUJPFKV, .rowiframeUJPFKV, .celliframeUJPFKV, .iframeUJPFKV, .emptyUJPFKV, .barUJPFKV, .barforemostUJPFKV, .bardockedUJPFKV, .cellUJPFKV, .leftUJPFKV, .rightUJPFKV, .buttoncontainerUJPFKV, .buttonUJPFKV, .buttonimageUJPFKV, .waitingUJPFKV, .handleUJPFKV, .queryUJPFKV, .hintUJPFKV, .templateUJPFKV, .firstlevelgroupUJPFKV, .notfirstlevelgroupUJPFKV{
background: none !important;
border: 0px !important;
border-style: none !important;
color: black !important;
direction: ltr !important;
float: none !important;
font-family: sans-serif !important;
font-size: small !important;
font-style: normal !important;
font-variant: normal !important;
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text-align: left !important;
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text-transform: none !important;
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white-space: normal !important;
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div.lookupUJPFKV{
display: table !important;
-webkit-transition: -webkit-box-shadow 0.25s linear, border-color 0.25s linear !important;
}
div.lookupforemostUJPFKV{
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span.buttoncontainerUJPFKV{
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a.buttonUJPFKV:link{
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a.buttonUJPFKV img.buttonimageUJPFKV{
display:inline !important;
vertical-align: middle !important;
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img.waitingUJPFKV{
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div.handleUJPFKV{
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left: 100% !important;
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</style><style>.tipVWFSAH, .arrowVWFSAH, .arrowupVWFSAH, .arrowdownVWFSAH, .mainVWFSAH, .closeVWFSAH, .barVWFSAH, .rowVWFSAH, .cellVWFSAH, .leftVWFSAH, .rightVWFSAH, .displaytitleVWFSAH, .refreshVWFSAH, .pagingVWFSAH, .brandVWFSAH, .textVWFSAH, .leftlabelVWFSAH, .selectVWFSAH, .checkboxVWFSAH, .waitingVWFSAH, .buttoncontainerVWFSAH, .buttonVWFSAH, .buttonimageVWFSAH, .flagVWFSAH, .noticebarscontainerVWFSAH, .noticebarVWFSAH, .iframecontentVWFSAH{
background: none !important;
border: 0px !important;
border-style: none !important;
color: black !important;
direction: ltr !important;
float: none !important;
font-family: sans-serif !important;
font-size: small !important;
font-style: normal !important;
font-variant: normal !important;
font-weight: normal !important;
letter-spacing: normal !important;
line-height: normal !important;
margin: 0px !important;
padding: 0px !important;
text-align: left !important;
text-decoration: none !important;
text-indent: 0px !important;
text-transform: none !important;
vertical-align: baseline !important;
white-space: normal !important;
}
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position: absolute !important;
display:block !important;
}
div.arrowVWFSAH{
display:block !important;
}
canvas.arrowupVWFSAH{
display: inline !important;
vertical-align: bottom !important;
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canvas.downupVWFSAH{
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-webkit-transition: opacity 0.5s linear !important;
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margin-right: -5px !important;
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div.barVWFSAH{
display: table !important;
margin-bottom: 4px !important;
-webkit-user-select: none !important;
width: 100% !important;
}
div.rowVWFSAH{
display: table-row !important;
}
div.cellVWFSAH{
display: table-cell !important;
vertical-align: middle !important;
}
.leftVWFSAH{
padding-right: 16px !important;
text-align: left !important;
}
.rightVWFSAH{
text-align: right !important;
}
span.refreshVWFSAH{
display: inline !important;
}
span.pagingVWFSAH{
display: inline !important;
font-size: x-small !important;
}
span.buttoncontainerVWFSAH{
display: inline !important;
}
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display: inline !important;
padding-left: 6px !important;
font-size: small !important;
font-weight: bold !important;
}
span.displaytitleVWFSAH a:link{
display: inline !important;
color: #0645AD !important;
text-decoration: none !important;
}
span.displaytitleVWFSAH img{
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}
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display: inline !important;
font-size: x-small !important;
}
.brandVWFSAH a{
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}
.brandVWFSAH a:link{
display: inline !important;
color: #0645AD !important;
text-decoration: none !important;
}
.brandVWFSAH a:visited{
display: inline !important;
color: #0B0080 !important;
text-decoration: none !important;
}
span.textVWFSAH{
display: inline !important;
font-size: x-small !important;
}
label.leftlabelVWFSAH{
display: inline !important;
font-size: x-small !important;
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<h1>PryTag</h1>
<p align="justify">PryTag is a cryptographic protocol for privacy preserving aggregation of data by an untrusted aggregator, tailored for dynamic populations.
Besides dynamicity, the other key point of the protocol is the non existence of a trusted key dealer who is aware of users' secret keys during the protocol execution.</p>
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<h2>Dynamicity</h2>
<p align="justify">PryTag in contrast with existing protocols provides dynamicity in the participation of users. Namely, dynamic leaves/joins of users have no impact to existing users thanks to the novel
key setup phase, which happens only once.</p>
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<h2>Privacy</h2>
<p align="justify">The protocol guarantees that the untrusted aggregator learns nothing but the aggregate of input data in cleartext and other participants learn nothing.</p>
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<h2>One rock two birds</h2>
<p align="justify">Due to the independent key generation that achieves dynamicity PryTag also supports trust relaxtion in the sense that no trusted key dealer is needed during the protocol execution. This allows to reduce overwhelming trust assumptions made in current protocols.</p>
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<h1></h1>
<h3>Introduction</h3>
<p align="justify">With the advent of networking applications collecting user data on a massive scale, the privacy of individual users appears to be a major concern.
The main challenge is the design of a solution that allows the data analyzer to compute global statistics over the set of individual inputs that are protected by
some confidentiality mechanism. Current approaches suggested a solution that allows a centralized party to compute the sum of encrypted inputs
collected through a smart metering network. The main shortcomings of this solution are its reliance on a trusted dealer for key distribution and the need for key updates
in the case of user joins or leaves. PryTag is a secure protocol for aggregation of time-series data in which the main shortcomings of existing solutions, namely, the requirement for key updates and for the trusted dealer are eliminated.
</p>
<li>
<b>Efficient and Secure Reachability Computation on Encrypted Location Data</b></a><br>
Hanyu Quan, Boyang Wang, Ming Li, Iraklis Leontiadis, and Yuqing Zhang
<br><i>in submission to TIFS</i>
</li>
<br>
<li>
<b>Collusion Resistant Aggregation from Convertible Tags</b><br>
Iraklis Leontiadis, Ming Li
<br><i>International Journal of Information Security (IJIS), pending revision</b> 2016</i>
<a href="./publications/aahgs.pdf"> [pdf]</a>
</li>
<br>
<li>
<b>SecReach: Secure Reachability Computation on Encrypted Location Check-in Data</b></a><br>
Hanyu Quan, Boyang Wang, Iraklis Leontiadis, Ming Li and Yuqing Zhang
<br><i>CANS 2016</b> Milan, November 2016</i><a href="./publications/paper_67.pdf"> [pdf]</a>
</li>
<br>
<li>
<b>PUDA - Privacy and Unforgeability for Data Aggregation</b></a><br>
Iraklis Leontiadis, Kaoutar Elkhiyaoui, Melek Onen, Refik Molva
<br><i>CANS 2015</b> Marrakesh, Morocco, December 2015 </i><a href="http://eprint.iacr.org/2015/562.pdf">[eprint 2015]</a>
</li>
<br>
<li>
<b>Private and Dynamic Time-Series Data Aggregation with Trust Relaxation</b></a><br>
Iraklis Leontiadis, Kaoutar Elkhiyaoui, Refik Molva
<br>
<i>CANS 2014</b> Heraklion, Crete, Greece, October 2014 </i><a href="http://www.eurecom.fr/~leontiad/publications/CANS2014.pdf">[slides]</a>, <a href="http://eprint.iacr.org/2014/256.pdf">[eprint 2014]</a>,
<br>
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<br>
<!--
<h3>Idea</h3>-->
<h3>Implementation</h3>
<p>A research unoptimized prototype <a href="https://github.com/JHUISI/charm/blob/dev/charm/schemes/lem_scheme.py">implementation</a> of PryTag is set forth.</p>
<div class="CSSTableGenerator" >
<table >
<tr>
<td>
Functionality (sec) \ #Users
</td>
<td>
250
</td>
<td >
500
</td>
<td>
1000
</td>
<td>
10000
</td>
</tr>
<tr>
<td>
<b>Average Encryption</b>
</td>
<td >
0.123
</td>
<td>
0.123
</td>
<td>
0.122
</td>
<td>
0.125
</td>
</tr>
<tr>
<td>
<b>Average Auxiliary </b>
</td>
<td >
0.130
</td>
<td>
0.130
</td>
<td>
0.130
</td>
<td>
0.125
</td>
</tr>
<tr>
<td>
<b>Collector Aggregate </b>
</td>
<td >
0.014
</td>
<td>
0.030
</td>
<td>
0.059
</td>
<td>
0.560
</td>
</tr>
<tr>
<td>
<b>Aggregator Decryption</b>
</td>
<td >
0.907
</td>
<td>
0.963
</td>
<td>
1.326
</td>
<td>
4.534
</td>
</tr>
</table>
</div>
<h3>Practical applications</h3>
<p></p>
<h4>Smart Metering</h4>
<p>
</p><h4>User Profiling</h4>
<p>
</p>
<h4>Medical Applications</h4>
<p>
</p>
<h4>Financial Transactions</h4>
<p>
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<h3>Phd Students</h3>
<a href="http://www.eurecom.fr/~leontiad">Iraklis Leontiadis</a>
<h3>Postdoctoral Researchers</h3>
<a href="http://www.eurecom.fr/en/people/elkhiyaoui-kaoutar">Dr. Kaoutar Elkhiyaoui</a>
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<a href="http://www.eurecom.fr/en/people/molva-refik">Full Professor Refik Molva</a>
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