[sdnog] Protonmail paying ransom in bitcoin

[Hiba Eltigani]

Salam SdNOG,,,,,
      Do you remember Bitcoin from SdNOG-1 ?!!! Apparently, Proton mail 
suffered massive DDoS attacks early in November and had to pay ransom in 
bitcoin. You can read more about it in below link. I am asking about the 
technical scenario behind the attack, I don't seem to find something. Also, 
what are the best practices to guard against DDoS or at least insure fast 
recover.

http://www.techtimes.com/articles/103982/20151107/protonmail-pays-6-000-ransom-to-stop-ddos-attacks-after-blackmail-still-got-knocked-offline.htm

Thanks in advance.
BR

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