![]() Will it persuade others to open up about their own protocol secrets? Watch this space. Put it all together and this looks like a great show of confidence by ExpressVPN. ![]() PDF defines a series of operators such as m for which we created the MoveTo () method in iText, lfor which we created the LineTo () method, and S for which we created the Stroke () method. That's not the same as looking at the source code, though, and being able to read exactly what those security experts think of the protocol's strengths and weaknesses.) When we talk about low-level content in iText documentation, we always refer to PDF syntax that is written to a PDF content stream. (Hotspot Shield has a support article (opens in new tab) stating "Catapult Hydra security code is evaluated by 3rd party security experts from more than 60% of the world’s largest security companies that use our SDK to provide VPN services to their users. But, unfortunately, there's no way to judge if this is true, because none of the other top proprietary protocols have been audited or open-sourced. VPN protocols are absolutely key to your privacy and security, so it's vital they're properly implemented. Several other VPN providers have their own proprietary protocols, including Hotspot Shield's Catapult Hydra and NordVPN's Nordlynx. But while they were important, the latest audit is something new. AnalysisĮxpressVPN has put itself through audits before, including a browser extension checkup (opens in new tab) in 2019 and a full no-log server audit (opens in new tab) by PricewaterhouseCoopers. ![]() The full audit report is now available on Cure53's site. The report conclusions raised some questions, but was broadly positive overall, saying the code is 'high quality', 'makes a relatively robust impression', and "the implementation should be good for production use."ĮxpressVPN patched the highlighted issues after the March 2021 audit, and Cure53 verified the fixes in a June 2021 follow-up.
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