
Our product, Spectra Message Center includes instant messaging integration which allow users to use instant messaging to do transaction (buying products). We have identified that for some services does not provide encrypted text conversation by default. A good pages describing and comparing instant messaging services is How safe is instant messaging? A security and privacy survey.
Here is a screen capture of their summary:
We use Yahoo! Messenger and Google Talk, as both has gained more popularity among our users. We have to rethink on how to securely transmit sensitive information over instant messenger, especially with Yahoo! Messenger.
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