Trillian Secure IM

Peter Gutmann pgut001 at
Mon Oct 8 22:21:27 EDT 2007

Ian G <iang at> writes:
>Peter Gutmann wrote:
>> "Alex Pankratov" <ap at> writes:
>>> SecureIM handshake between two version 3.1 (latest) clients takes about .. 48
>>> bytes. That's altogether, 32 bytes in one direction, and 16 in another. And
>>> that's between the clients that have never talked to each other before, so
>>> there's no "session resuming" business happenning.
>> Or they could be using static/ephemeral DH with fixed shared DH key values,
>> which isn't much better.  (This is just speculation, it's hard to tell without
>> knowing what the exchanged quantities are).
>Speculation is fun.
>But, opportunistic cryptography is even more fun.  It is very encouraging to
>see projects implement cryptography in limited forms.  A system that uses a
>primitive form of encryption is many orders of magnitude more secure than a
>system that implements none.

Opportunistic cryptography designed as opportunistic cryptography (with key
continuity measures and so on) is fun.

Opportunistic cryptography that exists because the developers have screwed up
something better (and are under the delusion that what they've implemented is
something better) is less fun.


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