Ddc25 on Ha1fdanhttps://ha1fdan.xyz/en/tags/ddc25/Recent content in Ddc25 on Ha1fdanHugoen-usha1fdan.xyzSat, 03 May 2025 00:00:00 +0000DDC - Nationals Junior 2025 : Writeupshttps://ha1fdan.xyz/en/posts/ddc_nationals_junior_2025/Sat, 03 May 2025 00:00:00 +0000https://ha1fdan.xyz/en/posts/ddc_nationals_junior_2025/<blockquote> <p>En kæmpe tak til DDC for at arrangere denne fantastiske begivenhed og til alle de deltagende for at gøre det til en uforglemmelig oplevelse! 🙌</p> </blockquote> <h2 id="junior-scoreboard-top-10">Junior Scoreboard (top 10):</h2> <p><img src="https://ha1fdan.xyz/ddc_nationals_2025/top_10_users.png" alt="ddc2024_scoreboard.png"></p> <hr> <h2 id="opgaver-løst">Opgaver løst:</h2> <table> <thead> <tr> <th>Challenge</th> <th>Category</th> <th>Value</th> </tr> </thead> <tbody> <tr> <td><a href="#random-aes">Random AES</a></td> <td>Cryptography</td> <td>100</td> </tr> <tr> <td><a href="#photo-album">Photo Album</a></td> <td>Web exploitation</td> <td>217</td> </tr> <tr> <td><a href="#1337guesser">1337guesser</a></td> <td>Reverse Engineering</td> <td>100</td> </tr> <tr> <td><a href="#block-party">Block Party</a></td> <td>Cryptography</td> <td>186</td> </tr> <tr> <td><a href="#unexpected-invoice">Unexpected Invoice</a></td> <td>Forensics</td> <td>353</td> </tr> <tr> <td><a href="#b%C3%B8f-baserede-v%C3%A6rdipapirer-og-emails">Bøf-baserede værdipapirer og emails</a></td> <td>Forensics</td> <td>557</td> </tr> <tr> <td><a href="#evilplot-parking-group">EvilPlot Parking Group</a></td> <td>Web exploitation</td> <td>186</td> </tr> <tr> <td><a href="#bugtracker">BugTracker</a></td> <td>Web exploitation</td> <td>100</td> </tr> <tr> <td><a href="#the-legend">The Legend</a></td> <td>Web exploitation</td> <td>709</td> </tr> <tr> <td><a href="#el-reverso">El Reverso</a></td> <td>Binary</td> <td>300</td> </tr> </tbody> </table> <p><strong>Disse opgaver gav mig 2808 points og en 6 plads i Junior kategorien.</strong></p>DDC - Regionals Junior 2025 : Writeupshttps://ha1fdan.xyz/en/posts/ddc_regionals_junior_2025/Sat, 05 Apr 2025 00:00:00 +0000https://ha1fdan.xyz/en/posts/ddc_regionals_junior_2025/<blockquote> <p>Tusind tak til DDC for at lave denne fantastiske CTF, og til alle de andre deltagere for at gøre det sjovt! Jeg havde en fantastisk tid og lærte meget. Jeg glæder mig til at se jer til nationals!</p> </blockquote> <h2 id="syddanmark-scoreboard">Syddanmark Scoreboard:</h2> <p><img src="https://ha1fdan.xyz/ddc_regionals_2025/syddanmark.png" alt="ddc2024_scoreboard.png"></p> <h2 id="global-scoreboard-top-10">Global Scoreboard (top 10):</h2> <p><img src="https://ha1fdan.xyz/ddc_regionals_2025/top10_global.png" alt="ddc2024_scoreboard.png"></p> <p><a href="https://ha1fdan.xyz/ddc_regionals_2025/Slides_RM_2025_announcement.pdf">Powerpoint med resultater</a></p> <hr> <h2 id="opgaver-løst">Opgaver løst</h2> <table> <thead> <tr> <th>Challenge</th> <th>Category</th> </tr> </thead> <tbody> <tr> <td><a href="#exponential-caesar">Exponential Caesar</a></td> <td>Crypto</td> </tr> <tr> <td><a href="#nitrogenerator">NitroGenerator</a></td> <td>Forensics</td> </tr> <tr> <td><a href="#wizardtrial">WizardTrial</a></td> <td>Reverse Engineering</td> </tr> <tr> <td><a href="#baby-session-forger">Baby session forger</a></td> <td>Misc</td> </tr> <tr> <td><a href="#katchat">KatChat</a></td> <td>Beginner</td> </tr> <tr> <td><a href="#gateway">Gateway</a></td> <td>Web exploitation</td> </tr> <tr> <td><a href="#sysmon-spectacle">sysmon-spectacle</a></td> <td>Forensics</td> </tr> <tr> <td><a href="#third-time-is-the-charm">Third time is the charm</a></td> <td>Boot2Root</td> </tr> <tr> <td><a href="#find-my-files">Find my files</a></td> <td>Boot2Root</td> </tr> <tr> <td><a href="#stuckat99">StuckAt99</a></td> <td>Binary</td> </tr> <tr> <td><a href="#systemreaper">SystemReaper</a></td> <td>Forensics</td> </tr> <tr> <td><a href="#hidden-in-plain-sight">Hidden in Plain Sight</a></td> <td>Misc</td> </tr> </tbody> </table> <p><strong>Disse opgaver gav mig 2636 points og en 3 plads i Syddanmark, og 4 plads på hele Junior platformen.</strong></p>DDC - Qualifiers Junior 2025 : Writeupshttps://ha1fdan.xyz/en/posts/ddc_qualifiers_junior_2025/Sun, 16 Mar 2025 00:00:00 +0000https://ha1fdan.xyz/en/posts/ddc_qualifiers_junior_2025/<h2 id="scoreboard">Scoreboard:</h2> <p><img src="https://ha1fdan.xyz/ddc_qual_2025/scoreboard_top10.png" alt="Scoreboard"></p> <p>Slut scoreboard: <a href="https://ha1fdan.xyz/ddc_qual_2025/scoreboard_med_score.png">Scoreboard med score (top 10)</a></p> <p><strong>Jeg var den første der kvalificerede sig på junior holdet, efter bare 24min og 44sek.</strong></p> <p><img src="https://ha1fdan.xyz/ddc_qual_2025/first_kval.png" alt="Discord Kvalifikation Besked"></p> <hr> <h2 id="opgaver-løst-i-den-rækkefølge-jeg-løste-dem">Opgaver løst (I den rækkefølge jeg løste dem):</h2> <table> <thead> <tr> <th>Challenge</th> <th>Category</th> </tr> </thead> <tbody> <tr> <td><a href="#aes-decryption">AES Decryption</a></td> <td>Cryptography</td> </tr> <tr> <td><a href="#find-frontdoor">Find Frontdoor</a></td> <td>Web exploitation</td> </tr> <tr> <td><a href="#read-the-rules">Read the rules</a></td> <td>Kvalifikation</td> </tr> <tr> <td><a href="#efterforskningen">Efterforskningen</a></td> <td>Forensics</td> </tr> <tr> <td><a href="#straba">Straba</a></td> <td>Forensics</td> </tr> <tr> <td><a href="#outxorcing">OutXORcing</a></td> <td>Reverse Engineering</td> </tr> <tr> <td><a href="#vigeneres-dictionary">Vigeneres dictionary</a></td> <td>Cryptography</td> </tr> <tr> <td><a href="#binary-encodings1">Binary-Encodings1</a></td> <td>Cryptography</td> </tr> <tr> <td><a href="#cross-site-job">Cross Site Job</a></td> <td>Web exploitation</td> </tr> <tr> <td><a href="#complete-styling-sadness">Complete Styling Sadness</a></td> <td>Web exploitation</td> </tr> <tr> <td><a href="#shutter-trace">Shutter Trace</a></td> <td>Misc</td> </tr> <tr> <td><a href="#long-live-caesar">Long live Caesar</a></td> <td>Cryptography</td> </tr> <tr> <td><a href="#hasher-is-back">Hasher is back</a></td> <td>Misc</td> </tr> <tr> <td><a href="#the-professors-lost-note">The Professors Lost Note</a></td> <td>Misc</td> </tr> <tr> <td><a href="#what-time-is-it">What time is it</a></td> <td>Reverse Engineering</td> </tr> <tr> <td><a href="#gotowin">gotowin</a></td> <td>Binary</td> </tr> <tr> <td><a href="#leaky-store">Leaky Store</a></td> <td>Web exploitation</td> </tr> <tr> <td><a href="#ping-sweep">ping-sweep</a></td> <td>Forensics</td> </tr> <tr> <td><a href="#the-gauntlet-pt-1">The Gauntlet pt 1</a></td> <td>Boot2root</td> </tr> <tr> <td><a href="#masahiro-hara">Masahiro Hara</a></td> <td>Misc</td> </tr> <tr> <td><a href="#passprotector">PassProtector</a></td> <td>Reverse Engineering</td> </tr> <tr> <td><a href="#pwn-me-good-uwu">PWN me good uwu</a></td> <td>Binary</td> </tr> <tr> <td><a href="#ddc-lounge">DDC Lounge</a></td> <td>Web exploitation</td> </tr> <tr> <td><a href="#covertchannel2">covertchannel2</a></td> <td>Forensics</td> </tr> <tr> <td><a href="#pwn-me-good-uwu---wifu-edition">PWN me good uwu - Wifu Edition</a></td> <td>Binary</td> </tr> </tbody> </table> <hr> <h3 id="aes-decryption">AES Decryption</h3> <p>You&rsquo;ve intercepted a Base64-encoded AES-encrypted message, along with a potential key. Analyze and decrypt the ciphertext to uncover the secret at:</p>