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At my presentation yesterday, keying for e2e protection in connection
with voice mailboxes was discussed. I believe this discussion got a bit
confused as we were coming from differing starting points and we had
different views on what should and/or can be achieved. I look at e2e protected mailboxes in a similar way as I consider secure email. In secure email the sender exactly specifies the specific person or group of persons he wants to send the email to, and a receiver can only read his email if his secure email credentials are available in the terminal he uses. I believe this is a feature of secure email. If you want to have access to your email from any terminal (not providing credentials for secure email) you have to rely on protected transport of the plaintext email from the email server to the client. Secure email is a valuable service used many private users and is also a standard in many large organizations like enterprises, government authorities etc. I believe that these user groups, appreciating secure email, should also be offered the possibility to have e2e protected voice (and multimedia) mailboxes. For this, the proposed extensions in SRTP are needed. Note that this work is not only (or perhaps even mainly) motivated by the voice mailbox use case but also relates to the media distribution use cases described in the draft. Rolf Blom Ericsson Research |
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