Hi Rich,

It is widely recognized that in many cases, TLS-level compression is
flawed (for example NNTP authinfo?).

Though I've read a few pages explaining how CRIME and BEAST attacks work, I still do not see well how TLS-level compression would make NNTP vulnerable.
Same thing for POP or IMAP I believe.

The news server does not leak information.  The responses are just OK or KO.
For instance:

AUTHINFO USER test
381 Enter password
AUTHINFO PASS test
281 Authentication succeeded

or in the case of an authentication failure:

AUTHINFO USER test
381 Enter password
AUTHINFO PASS badpassword
481 Authentication failed



How compression would make NNTP weaker?
(Brute-force attack is still necessary, even with compression enabled.)

--
Julien ÉLIE

« Etna : lave dévalante. »

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