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In this extra-special episode of CTF Radiooo, adamd and Zardus host the WINNERS of DC 28 CTF: A*0*E.

From A*0*E we’re joined by Captain Gengming aka dmxcsnsbh, Vice-Captain Hui Shin aka septyem, Founder Tianyi aka Jackyxty, and DevOps silver!

We discuss how everyone got into CTFs, the history of A*0*E (the short version is A*0*E = EEE ∪ AAA ∪ 0ops ∪ ******), DC 28 CTF, DC 26 madness (on adamd and Zardus’ side, including social engineering a parking spot), and how to succeed at CTFs.

Silver’s amazing diagram of their networking setup:
+---------------------------------------------------------------------------+
| |
| >Other players in our team< |
| |
+-----------------+----------------------------------+----------------------+
| |
| |
| OpenVPN | OpenVPN
| | The `dc28-redir-controller`
+--------+------+ +------+--------+ is deployed here
| | | |
| VPN Endpoint | | VPN Endpoint | |
| for CHN users | | for USA users | |
| | | | v
+-------+-------+ +-------+-------+
| | +---------------------------+ +--------------------+
| bandwidth and ACL limited! | | | | |
| save some money ;) | | Jumpbox, config copied +-----+ OOO's WG endpoint |
| | | +-----+ from OOO's machine | | |
| | | | | | | |
+---------------------------------+ | v | | +---------------------------+ +--------------------+
| | +-----+-----+ +-----+-----+ |
| CPU-intensive applications | | | QoS Promised | | |
| since EPYC servers are only +------+ Gateway +------------------------+ Gateway +------+ +------------------------------------+
| available in CHN available zone | | China | MPLS VPN? not sure. | U.S West | | |
| | | | 110-130ms, <0.1% loss | +------------+ Latency-aware programs |
+---------------------------------+ +-----------+ +-----------+ | & |
| Traffic-heavy programs (like pcap) |
| Reduce costs under the ocean |
| |
+------------------------------------+
- All connections are using WireGuard unless specified.
- Netdata is installed on all machines so we can do remote telemetry
and receive alarms.


Links


A*0*E redirection controller
0CTF/TCTF finals (which was last month, sorry the recording happened before)

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