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[tor-talk] Questions about crypto used in TAP/Ntor

Dear experts,

Want to clarify some things:

1. The fignerprint of a Tor relay which is advertised in the direcotry
data is a SHA1 sum of which key? Sice now a relay has a secret onion key
and a secret key for Ntor.

2. The fingerprint (since it's a hash sum of the key) is what strengths
encryption between relays or clients and relays, kind of like a CA in SSL?
That is why the directory authorities sign the list of fingereprints - is
this correct?

3. How strong is Ntor compared to TAP? As I can see in latest Tor version
now clients prefer Ntor by default - are there any plans to deprecate TAP
in teh future?

4. The fingerprint is a SHA1 hash, as described in the papers. Any plans
to move in the immediate future to a stronger hash algorithm, like SHA256?

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