[tor-dev] Is it time to drop support for the v1/v2 protos?

[Philipp Winter]

On Sat, Dec 27, 2014 at 03:38:28PM +0100, Tom van der Woerdt wrote:
> After reading the Tor spec [1] I did some digging and realized that
> the old handshakes and link protocols (v1 (certs up-front) and v2
> (renegotiation)) are not used anymore as of 0.2.3.6-alpha which
> introduced link proto v3.
> 
> Supporting v1 and v2 requires (among other things) supporting SSLv3
> which (imho) should be deprecated everywhere.

I was curious about how many relays and clients still want to speak
version 1 and 2.  I patched one of my guard relays to keep statistics
about the content of VERSIONS cells.  Here's the result after almost
three days.  The numbers include relays as well as clients.

  Versions |  Amount total | Amount w/o duplicate hosts
  ---------+---------------+---------------------------
   1 and 2 |  34,648  (9%) | 21,552 (23%)
         3 |  73,202 (18%) | 54,307 (59%)
   3 and 4 | 291,807 (73%) | 16,235 (18%)
         4 |       3  (0%) |      2  (0%)

Cheers,
Philipp