added official hacktheboo2024 writeups

htb/hacktheboo2024/crypto/[Very Easy] sekur julius/release/crypto_sekur_julius/output.txt

@@ -0,0 +1 @@
+LTARDBT0ID0WPRZIWTQDD0ILDIWDJHPCSILTCINUDJG!0IWXH0XH0P0EGDDU0DU0RDCRTEI0ID0EGDKT0NDJ0IWPI0IWT0RPTHPG0RXEWTG0XH0XCHTRJGT0CD0BPIITG0WDL0BPCN0IXBTH0NDJ0PEEAN0XI.0IWT0HTRJGXIN0DU0P0IWDJHPCS0SXHIXCRI0HWXUIH0XH0TKTCIJPAAN0IWT0HPBT0PH0IWPI0DU0P0HXCVAT0HWXUI.0TCDJVW0BJBQAXCV,0IPZT0NDJG0UAPV0PCS0TCYDN0IWT0GTHI0DU0IWT0RDCITHI.0BPZT0HJGT0NDJ0LGPE0IWT0UDAADLXCV0ITMI0LXIW0IWT0WIQ0UAPV0UDGBPI0HTRJGXINDUPIWDJHPCSDGHTRJGXINDUPHXCVAT.

htb/hacktheboo2024/crypto/[Very Easy] sekur julius/release/crypto_sekur_julius/source.py

@@ -0,0 +1,24 @@
+from random import choices
+
+def julius_encrypt(msg, shift):
+    ct = ''
+    for p in msg:
+        if p == ' ':
+            ct += '0'
+        elif not ord('A') <= ord(p) <= ord('Z'):
+            ct += p
+        else:
+            o = ord(p) - 65
+            ct += chr(65 + (o + shift) % 26)
+    return ct
+
+def encrypt(msg, key):
+    for shift in key:
+        msg = julius_encrypt(msg, shift)
+    return msg
+
+msg = open('secret.txt').read().upper()
+secure_key = os.urandom(1337)
+
+with open('output.txt', 'w') as f:
+    f.write(encrypt(msg, secure_key))