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o Major security fixes (directory authorities):
- Directory authorities now include a digest of each relay's
identity key as a part of its microdescriptor.
This is a workaround for bug #11743 (reported by "cypherpunks"),
where Tor clients do not
support receiving multiple microdescriptors with the same SHA256
digest in the same consensus. When clients receive a consensus
like this, they only use one of the relays. Without this fix, a
hostile relay could selectively disable some client use of target
relays by constucting a router descriptor with a different
identity and the same microdescriptor parameters and getting the
authorities to list it in a microdescriptor consensus. This fix
prevents an attacker from causing a microdescriptor collision,
because the router's identity is not forgeable.
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