Coin,
All our encrypted services are based on our self-signed CA which in turn generates SSL/TLS certificates for all secure services. Our current CA is now 10 years old and using older encryption algorithms, so it's time to rollover.
Thus, you need to add the new 'duckcorp.crt' file on your systems _before_ 2014-10-04. The switch may occur a tad later but i plan to swiftly get this over with.
If you don't know to install the file, you should have a look in the wiki: https://users.duckcorp.org/index.php/Services/Security#TLS.2FSSL-based_Servi... Beware you need to leave the previous file around until the switch is done (simply rename it).
As for the new file itself, 'duckcorp.crt', it is attached in this mail (and updated in the wiki too). Nevertheless, if you have keysigned (GPG) with one of the admin, you should verify and extract it using the following command: gpg --output duckcorp.crt <pilou_duckcorp.crt.asc (replace 'pilou' by 'arnau' or 'duck' accordingly to your web of trust)
Have a Lot of FUN !