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<!DOCTYPE html>
<html lang="en" itemscope itemtype="http://schema.org/Blog">
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<title>Passepartout, OpenVPN client for iOS and macOS</title>
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<meta name="author" content="Davide De Rosa" />
<meta name="description" content="Passepartout is a non-official, user-friendly OpenVPN® client for iOS and macOS." />
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<meta name="apple-mobile-web-app-title" content="Passepartout">
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<header>
<a href="https://passepartoutvpn.app"><img id="logo" src="/s/logo.svg" alt="Passepartout" /></a></h1>
<h1><a href="https://passepartoutvpn.app">Passepartout</a></h1>
<p>A non-official, user-friendly OpenVPN® client for iOS. Soon for macOS.</p>
</header>
<main>
<h2 id="frequently-asked-questions">Frequently Asked Questions</h2>
<h3 id="why-is-compression-not-supported">Why is compression not supported?</h3>
<p>Some users may have noticed that Passepartout is not compatible with any compression algorithm supported by OpenVPN. This is intentional and comes from a logical reasoning. Besides being a relevant overhead against marginal gains -most protocols in the application layer (e.g. HTTP) already use compression nowadays-, compression is vulnerable to an attack that may be able to reveal the secret session keys.</p>
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<p>The attack is called VORACLE and is <a href="https://community.openvpn.net/openvpn/wiki/VORACLE">extensively explained</a> by the very authors of OpenVPN. Most major providers have taken action and fixed the issue, but many are still refraining to disable compression for no acceptable reason. In case this happens, you are warmly encouraged to report the issue immediately and possibly link to either the official resource you find above, as it comes directly from the software makers, or this page.</p>
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<p>BEWARE: it’s not about making the app work, this is about <em>your safety</em>. Do prompt your provider to disable compression ASAP. Most of the time it’s as easy as tweaking a single configuration line on their backends.</p>
<p>Keeping it broken is absolutely irresponsible.</p>
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<p class="notice">
Copyright (c) 2018 <a href="https://davidederosa.com" title="The author website">Davide De Rosa</a><br />
The logo is taken from the awesome <a href="https://www.iconfinder.com/iconsets/circle-icons-1" title="Circle Icons">Circle Icons</a> set by <a href="https://www.elegantthemes.com/" title="Elegant Themes">Nick Roach</a>
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