https://www.reddit.com/r/netsec/new/を見ていたら、たまたまCTFを見つけたのでやってみました。 Junior CTFな

[Misc]: Signal Challenge There is no signal, everything is silent. Nothing is impossible. Attachment: signal.pdf 開くと、こんな感じ。（以下は、スクリーンショットです。） Solution 回答だけじゃなくて、一応やったことも記録に残しておき

[Crypto]: Twenty-five Challenge With “ppencode”, you can write Perl code using only Perl reserved words. Attachments: crypto.txt（ppencodeでエンコードされたファイル） reserved.tx

[Web]: cant_even_unplug_it Challenge You know, we had this up and everything. Prepped nice HTML5, started deploying on a military-grade-secrets.dev subdomain, got the certificate, the whole shabang. Boss-man got moody and wanted another name, we set up the new names and all. Finally he got scared and unplugged the server. Can you believe it? Unplugged. Like that can keep it secret… Hint: these are HTTPS