<feed xmlns="http://www.w3.org/2005/Atom"> <id>https://blog.sl91994.com/</id><title>SL9-1994's blog</title><subtitle>SL9-1994's blog using Jekyll chirpy theme.</subtitle> <updated>2026-08-01T23:12:25+09:00</updated> <author> <name>SL9-1994</name> <uri>https://blog.sl91994.com/</uri> </author><link rel="self" type="application/atom+xml" href="https://blog.sl91994.com/feed.xml"/><link rel="alternate" type="text/html" hreflang="ja" href="https://blog.sl91994.com/"/> <generator uri="https://jekyllrb.com/" version="4.4.1">Jekyll</generator> <rights> © 2026 SL9-1994 </rights> <icon>/assets/img/favicons/favicon.ico</icon> <logo>/assets/img/favicons/favicon-96x96.png</logo> <entry><title>FEAT:🚩 (B-SIDE) AlpacaHack 「Long Flag Printer 2026」Medium</title><link href="https://blog.sl91994.com/posts/long_flag_printer_2026/" rel="alternate" type="text/html" title="FEAT:🚩 (B-SIDE) AlpacaHack 「Long Flag Printer 2026」Medium" /><published>2026-08-01T22:46:00+09:00</published> <updated>2026-08-01T22:46:00+09:00</updated> <id>https://blog.sl91994.com/posts/long_flag_printer_2026/</id> <content type="text/html" src="https://blog.sl91994.com/posts/long_flag_printer_2026/" /> <author> <name>SL9-1994</name> </author> <category term="CyberSecurity" /> <category term="CTF" /> <summary>コンテナの設定と通信のキープ処理を利用するMisc問題</summary> </entry> <entry><title>FEAT:🚩 Daily-AlpacaHack 「Unrevealed TXT」Easy</title><link href="https://blog.sl91994.com/posts/unrevealed_txt/" rel="alternate" type="text/html" title="FEAT:🚩 Daily-AlpacaHack 「Unrevealed TXT」Easy" /><published>2026-08-01T15:11:00+09:00</published> <updated>2026-08-01T15:15:00+09:00</updated> <id>https://blog.sl91994.com/posts/unrevealed_txt/</id> <content type="text/html" src="https://blog.sl91994.com/posts/unrevealed_txt/" /> <author> <name>SL9-1994</name> </author> <category term="CyberSecurity" /> <category term="CTF" /> <summary>権威DNSサーバのゾーン転送設定を利用して，ホスト名が不明なTXTレコードを読み取るMisc問題</summary> </entry> <entry><title>FEAT:🚩 CryptoHack 「Adrien's Signs (Modular Arithmetic)」</title><link href="https://blog.sl91994.com/posts/adriens_signs/" rel="alternate" type="text/html" title="FEAT:🚩 CryptoHack 「Adrien&amp;apos;s Signs (Modular Arithmetic)」" /><published>2026-07-30T23:37:00+09:00</published> <updated>2026-07-31T12:19:54+09:00</updated> <id>https://blog.sl91994.com/posts/adriens_signs/</id> <content type="text/html" src="https://blog.sl91994.com/posts/adriens_signs/" /> <author> <name>SL9-1994</name> </author> <category term="CyberSecurity" /> <category term="CTF" /> <summary>モジュラ演算におけるルシャンドル記号の性質を利用して，ビット化されたFlagを逆算するCrypto問題</summary> </entry> <entry><title>FEAT:🚩 Daily-AlpacaHack 「RFC100008」Easy</title><link href="https://blog.sl91994.com/posts/rfc_100008/" rel="alternate" type="text/html" title="FEAT:🚩 Daily-AlpacaHack 「RFC100008」Easy" /><published>2026-07-28T00:05:00+09:00</published> <updated>2026-07-28T00:05:00+09:00</updated> <id>https://blog.sl91994.com/posts/rfc_100008/</id> <content type="text/html" src="https://blog.sl91994.com/posts/rfc_100008/" /> <author> <name>SL9-1994</name> </author> <category term="CyberSecurity" /> <category term="CTF" /> <summary>RFC 9110 に定義されている Allow ヘッダを利用して外部から許可されたメソッドを探るWeb問題</summary> </entry> <entry><title>FEAT:🚩 Pwnable.kr 「fd (Toddler's Bottle)」</title><link href="https://blog.sl91994.com/posts/toddlers_bottle_fd/" rel="alternate" type="text/html" title="FEAT:🚩 Pwnable.kr 「fd (Toddler&amp;apos;s Bottle)」" /><published>2026-07-27T22:34:00+09:00</published> <updated>2026-07-27T22:47:55+09:00</updated> <id>https://blog.sl91994.com/posts/toddlers_bottle_fd/</id> <content type="text/html" src="https://blog.sl91994.com/posts/toddlers_bottle_fd/" /> <author> <name>SL9-1994</name> </author> <category term="CyberSecurity" /> <category term="CTF" /> <summary>file descriptor の理解を試すpwn問題</summary> </entry> </feed>
