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ITF.競プロCTF勉強#3 CTF Network ed.
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競プロCTF第三回目 ネットワーク編の資料
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ITF.競プロCTF勉強#3 CTF Network ed.
1.
ITF.競プロCTF勉強#3 CTF Network ed. @prpr_man
2.
Agenda • Bio • CTF
Recap • Network • Wireshark • Usage • Problem
3.
Bio • @prpr_man • せきゅきゃんでてません •
しーてぃーえふできません • ねっとわーくできません
4.
CTF
5.
CTF Recap • Capture
The Flag • 脆弱性とかついてフラッグを集める ネトゲ(らしい) • セキュリティのお勉強になる
6.
CTF Recap Cont. •
Binary • Pwn • Network • Web • Forensics • Crypto
7.
CTF Recap Cont. •
Binary • Pwn • Network • Web • Forensics • Crypto
8.
Network • パケットの中身みたりとか, 通信内容から問題を解く • .pcapファイルが用意されてます •
Wireshark
9.
Wireshark
10.
Wireshark • ネットワークアナライザ • ネットワークを流れるデータを覗ける •
多数のプロトコルに対応(数百種類) • マルチプラットフォーム • CTFではとりあえず入れておけばなんとかなるやつ
11.
いれよう!
12.
Usage
13.
Problem
14.
CpawCTF Q16 HTTP Trafic http://cpaw.spica.bz/questions.php?qnum=16 Problem
1
15.
Hint Wiresharkには送受信したファイルを 吐き出す機能があるらしいゾ!
16.
Answer • File →
Export Objects → HTTP → Save All • 閲覧していたHTMLやJSファイルを出力できる
17.
Answer Cont.
18.
Problem 2 ksnctf #8 Basic
is secure? http://ksnctf.sweetduet.info/problem/8
19.
Hint • Basic認証で調べる • データをよく見る
20.
Answer • WiresharkがBase64をデコードしてくれてる
21.
Easy ? • 簡単やんけ! •
(任意の)宿題として ksnctf #9 Digest is secure! http://ksnctf.sweetduet.info/problem/9 • おそらく今までどおりすぐには解けない
22.
Important things
23.
調べましょう
24.
Important thing • 調べよう •
ダイジェスト認証の仕組みとか Bluetoothの仕様とか • 調べて学めば強くなる(と思う)
25.
ITF.競プロCTF勉強#3 CTF Network ed. @prpr_man
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