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|Scenario Task Description=A secure chat involves confidentiality between the conversing parties - no one else can read the transcript. It should also include authenticity - whereby all parties can be confident of who they are chatting with. Theses properties are achieved through end-to-end encryption and key verification. The chat record is not accessible to the service provider (e.g. Google, Microsoft, Yahoo, Facebook do not offer these services in their chat programs). Take a look at the [https://www.eff.org/secure-messaging-scorecard Secure Messaging Scorecard] from EFF to see how they rate various chat clients that claim security properties.
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The standard for a secure two-party conversation is called [https://en.wikipedia.org/wiki/Off-the-Record_Messaging OTR - Off the record messaging] and several popular chat clients offer it, including [https://securityinabox.org/en/guide/pidgin/windows Pidgin with OTR] for Windows and Linux, [https://ssd.eff.org/en/module/how-use-otr-mac Adium] for Mac, [https://securityinabox.org/en/guide/jitsi/windows Jitsi] for all common desktop operating systems. The latter also includes secure audio and video conferencing. These clients work with your existing accounts on Google, Facebook, Yahoo, etc. and encrypt the conversation on over the respective networks.
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Several chat clients are available as an add-on to your web browser, including [https://crypto.cat Cryptocat] and [https://mega.nz Mega]. Aside from that, several free messaging services offer similar encryption properties for messaging including [https://peerio.com/ Peerio] and [https://telegram.org/ Telegram]. All of the tools mentioned within are available as open source software and publicly disclose the encryption methods they employ in their software.
