[guardian-dev] Silent Text for Android - interesting feature

[Matej Kovacic]

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Hi,

I mentioned this "burn notice" feature, because is is interesting and
could be useful in some circumstances.

Yes, there is an analog hole (assuming taking screenschoots of
ChatSecure on a phone will be disabled in a future), but there is
alano analog hole in ZRTP encrypted phone conversations (someone can
set up a bug in your office/home/car).

In general, yes, there is a problem of how to assure that the other
party will delete message when requested.

Have anyone thought of time stamping (time stamp should be a part of a
crypto key) or using tokens (you can get only one token to decrypt
message once)?

P. S. It is just an idea, but could be interesting experiment - how to
implement burn notice with opensource software (user can modify it's
client) while having full control of your crypto keys?

Regards,

Matej
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