"According to the release notes, Tails 1.3.1 is an emergency release
that includes Tor Browser 4.0.5, based on the patched Mozilla Firefox
31.5.3 ESR web browser, fixing critical security issues disclosed at
the Pwn2Own hacking contest.
Tails 1.3.1 has now transitioned to an all-new OpenPGP signing key,
which is currently used to sign the official ISO images of the
distribution, as well as to certify other OpenPGP keys that are used
by the project. More details can be found here."
Peter Reutemann, Dept. of Computer Science, University of Waikato, NZ
Ph. +64 (7) 858-5174