Kopete/OTR

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Off-the-Record Messaging

This plugin allows encrypted conversations with people using clients with OTR capability as well. Enabling this plugin, an icon with a lock will be available in chat windows. It will allow to start OTR sessions. Before being able to start OTR sessions, you will have to generate a private key for each account. This operation can be easily performed in the plugin's configuration dialog.

Details

OTR provides encryption and authentication (if the fingerprint of the other participant is accepted) but the messages aren't signed, so participant can deny the conversation.

Policy

Plugin offers four policies to decide when start sessions:

Always: OTR session will be started in each conversation
Manual: OTR session will be started only manually
Opportunistic: OTR session will be started if the other client supports it
Never: OTR session will never be started

Clients

The wikipedia page about OTR has a list of clients that support it.

Links

http://en.wikipedia.org/wiki/Off-the-Record_Messaging