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<ol class="chapter"><li class="chapter-item expanded "><a href="index.html"><strong aria-hidden="true">1.</strong> index</a></li><li class="chapter-item expanded affix "><li class="part-title">Cryptography</li><li class="chapter-item expanded "><a href="caesar_salad.html"><strong aria-hidden="true">2.</strong> Caesar Salad</a></li><li class="chapter-item expanded "><a href="xor_everything.html"><strong aria-hidden="true">3.</strong> XOR everything, shouldn't you?</a></li><li class="chapter-item expanded "><a href="im_committed.html"><strong aria-hidden="true">4.</strong> I'm committed, or am I?</a></li><li class="chapter-item expanded "><a href="ascii_wonders.html"><strong aria-hidden="true">5.</strong> ASCII Wonders!</a></li><li class="chapter-item expanded "><a href="xor_encryption.html"><strong aria-hidden="true">6.</strong> XOR Encryption</a></li><li class="chapter-item expanded "><a href="the_two_columns.html"><strong aria-hidden="true">7.</strong> The Two Columns</a></li><li class="chapter-item expanded "><a href="a_different_one.html"><strong aria-hidden="true">8.</strong> A different one</a></li><li class="chapter-item expanded "><a href="a_tough_nut.html" class="active"><strong aria-hidden="true">9.</strong> A tough nut</a></li><li class="chapter-item expanded affix "><li class="part-title">Forensics</li><li class="chapter-item expanded "><a href="random_file.html"><strong aria-hidden="true">10.</strong> Random file</a></li><li class="chapter-item expanded "><a href="jpeg_image.html"><strong aria-hidden="true">11.</strong> JPEG Image</a></li><li class="chapter-item expanded "><a href="file_size.html"><strong aria-hidden="true">12.</strong> File Size</a></li><li class="chapter-item expanded "><a href="really_a_text_file.html"><strong aria-hidden="true">13.</strong> Really a Text File?</a></li><li class="chapter-item expanded "><a href="qr_mania.html"><strong aria-hidden="true">14.</strong> QR Mania</a></li><li class="chapter-item expanded affix "><li class="part-title">Misc</li><li class="chapter-item expanded "><a href="atm.html"><strong aria-hidden="true">15.</strong> ATM</a></li><li class="chapter-item expanded "><a href="beat_the_system.html"><strong aria-hidden="true">16.</strong> Beat the System</a></li><li class="chapter-item expanded affix "><li class="part-title">Web Exp</li><li class="chapter-item expanded "><a href="chall_1.html"><strong aria-hidden="true">17.</strong> Challenge 1</a></li><li class="chapter-item expanded "><a href="chall_2.html"><strong aria-hidden="true">18.</strong> Challenge 2</a></li><li class="chapter-item expanded "><a href="chall_3.html"><strong aria-hidden="true">19.</strong> Challenge 3</a></li><li class="chapter-item expanded "><a href="chall_4.html"><strong aria-hidden="true">20.</strong> Challenge 4</a></li></ol>
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<h1 id="a-tough-nut"><a class="header" href="#a-tough-nut">A tough nut</a></h1>
<p>Over here, the bold letters when entered into a ROT13 cipher give the key that that is used for decrypting the vigenere cipher encrypted with that key.</p>
<p>A python script to do the job.</p>
<pre><code class="language-py">#!/usr/bin/python3
from string import ascii_letters
def vigenere_decode(key, encryption):
decrypt = ""
key = key.lower()
encryption = encryption.lower()
for i in range(len(encryption)):
if encryption[i] in ascii_letters:
decrypt += chr(
(ord(encryption[i]) - ord(key[i % len(key)])) % 26 + ord("a")
)
else:
decrypt += encryption[i]
return decrypt
print(vigenere_decode("lemon", "LXFOPVEFRNHR"))
</code></pre>
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