PHDays CTF 2017
https://ctf.phdays.com/
PHDays CTF 2017 starts on May 12, 2017 at 16:00 UTC and will last for 9 hours. As usual, the network will be closed for the first hour. Registration is closed.
Positive Hack Days - Wikipedia
https://en.wikipedia.org/wiki/Positive_Hack_Days
Positive Hack Days (PHDays) is a computer security conference held every year in Moscow. The first conference was held in 2011. The conference addresses such topics as zero-day attacks and digital investigations, cryptography and cyberwarfare, the security of a person and a state in the cyberworld.
CTFtime.org / All about CTF (Capture The Flag)
https://ctftime.org/ctfs
Trend Micro CTF - Raimund Genes Cup is a capture the flag competition hosted by Trend Micro, a global leader in cybersecurity with a mission to make the world safe for exchan...
GitHub - HackerDom/phdctf-2017: PHDays Online CTF 2017.
https://github.com/HackerDom/phdctf-2017
PHDays CTF2017 is an online international challenge in the information security. The contest is driven by classic rules (Attack-Defense CTF) Each team is given a set of vulnerable services.