

Wire's developers announced the addition of end-to-end authentication to Wire's calls on 14 March 2017, and started open-sourcing Wire's server code on 7 April 2017. The researcher described the security of Wire as weak in comparison to Signal, but also depicted its problems as surmountable. These included a man-in-the-middle attack on voice and video communications, possible audio and video leakage depending on unspecified codec parameters, the fact that all user passwords are uploaded to Wire's servers, significant attack surface for code replacement in the desktop client, and the fact that the server was not open-sourced, at the time when that article was written. The researcher praised Wire for its open approach to security, but identified serious issues that still need addressing. In December 2016, Wire's whitepapers were reviewed by a security researcher at the University of Waterloo. Wire is 100% open source with its source code available on GitHub, independently audited, and ISO, CCPA, GDPR, SOX-compliant. Wire implemented a security by design approach, with security and privacy as core values. Among other things, users who have compiled their own applications may not change the way it connects and interacts with the company's centralised servers. Wire's source code is accompanied by the GPLv3 but the readme file states that a number of additional restrictions specified by the Wire Terms of Use take precedence. During an interview with Dark Reading, Raphael Robert, Head of Security at Wire, mentioned that Messaging Layer Security (MLS) should be ready to integrate into messaging platforms by 2021. In 2016, during the IETF meeting in Berlin, Wire proposed a standard that was protected by modern security properties and could be used by companies large and small. Wire is currently in the midst of working to develop Messaging Layer Security (MLS), a new protocol designed to facilitate more secure enterprise messaging platforms under The Internet Engineering Task Force (IETF). In addition to this, client-server communication is protected by Transport Layer Security. Wire's voice calls are encrypted with DTLS and SRTP. Wire's instant messages are encrypted with Proteus, a protocol that Wire Swiss developed based on the Signal Protocol. Wire provides end-to-end encryption for all features. Wire also includes a function for ephemeral messaging in 1:1 and group conversations.
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Wire's secure guest rooms feature extends end-to-end encryption to conversations with external parties without requiring them to register, or even download anything. One of the latest features rolled out by Wire is a secure external collaboration capability called 'guest room'. Wire's technology solution can be deployed either in the cloud, private cloud or on-premises. The desktop version supports screen sharing.

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Wire activity is synced on iOS, Android and web apps. Wire is available on mobile, desktop and web. The iOS and Android versions also include a sketch feature that allows users to draw a sketch into a conversation or over a photo. The application supports the exchange of animated GIFs up to 5MB through a media integration with Giphy. The application adapts to varying network conditions. A stereo feature places participants in "virtual space" so that users can differentiate voice directionality. The app allows group calling with up to twenty-five participants and video conferences support up to 12 people. Wire offers end-to-end encrypted messaging, file-sharing, video and voice calls, and guest rooms for external communication. In 2018, Wire launched its collaboration solution featuring end-to-end encrypted chat, conferencing, video calls and file-sharing on desktop and mobile for businesses. Wire Swiss GmbH released the source code of the Wire client applications in July 2016. In March 2016, the company added end-to-end encryption for its messaging traffic, as well as a video calling feature. From its launch until March 2016, Wire's messages were only encrypted between the client and the company's server. In August 2015, the company added group calling to their app. Wire Swiss GmbH launched the Wire app on 3 December 2014. Skype's co-founder Janus Friis helped create Wire and many Wire employees previously worked for Skype.
