https://thedeanangle.xyz/tags/caesar-cipher/ Recent content in Caesar Cipher on Hugo en-gb Tue, 29 Apr 2025 00:00:00 +0000 https://thedeanangle.xyz/ctf/cyber-apocalypse-ctf-2025/enchanted-cipher/ Tue, 29 Apr 2025 00:00:00 +0000 https://thedeanangle.xyz/ctf/cyber-apocalypse-ctf-2025/enchanted-cipher/ <p><img src="https://thedeanangle.xyz/images/ctf/cyberapoc/coding/enchantedcipher/1.png" alt=""></p> <h2 id="-enchanted-cipher--write-up--cyber-apocalypse-2025">🧙‍♂️ Enchanted Cipher — Write-Up | Cyber Apocalypse 2025</h2> <table> <thead> <tr> <th style="text-align: center">Details</th> <th style="text-align: left"><img src="https://thedeanangle.xyz/images/htbctf.svg" alt=""></th> </tr> </thead> <tbody> <tr> <td style="text-align: center"><strong>URL</strong></td> <td style="text-align: left">[Hack The Box :: Enchanted Cipher</td> </tr> <tr> <td style="text-align: center"><strong>Difficulty</strong></td> <td style="text-align: left">Easy</td> </tr> <tr> <td style="text-align: center"><strong>Team Rank</strong></td> <td style="text-align: left">541 / 8129</td> </tr> <tr> <td style="text-align: center"><strong>CTF Date</strong></td> <td style="text-align: left">26 Mar, 13:00</td> </tr> </tbody> </table> <hr> <h2 id="-challenge-summary">📖 Challenge Summary</h2> <p>The <strong>Grand Arcane Codex</strong> has been corrupted. To restore historical records, each entry must be deciphered from an <strong>Enchanted Shifting Cipher</strong>. This cipher encrypts messages using a Caesar-style shift, but with a twist:</p> <h3 id="-cipher-rules">🧩 Cipher Rules</h3> <ul> <li>Only <strong>alphabetic characters</strong> are encrypted; all other characters (e.g., spaces) are ignored during encryption.</li> <li>Characters are grouped into <strong>chunks of 5 letters</strong>.</li> <li>Each group is encrypted with a <strong>random Caesar shift</strong> (between 1 and 25).</li> <li>The input ends with: <ol> <li>The number of shift groups.</li> <li>A list of Caesar shift values, one for each group.</li> </ol> </li> </ul> <p>Your task is to <strong>reverse the cipher</strong>, restoring the original plaintext <strong>while preserving the formatting</strong> (spaces, punctuation, etc.).</p>