[tor-relays] New upcoming requirement for relays related to Ed25519 support

[teor]

> On 28 Apr 2018, at 08:05, nusenu <nusenu-lists at riseup.net> wrote:
> 
> we want to inform you that in future*, tor directory authorities 
> will enforce a new security measurement that disallows relays to 
> drop Ed25519 support in case they ever supported it at some point.
> 
> In practice that means that if you run tor 0.2.7.2-alpha or later
> you can not downgrade to an older tor version without Ed25519 support
> anymore.
> Tor directory authorities will reject such relays in the future.
> 
> You are safe if you do _not_ downgrade from 
> any tor version >= 0.2.7.2-alpha
> to a version older than that.

If you need to downgrade, you must delete your entire keys directory.

T