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Challenge/chall.py

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+#!/usr/bin/env python3
+
+from struct import pack, unpack
+flag = b'darkCON{XXXXXXXXXXXXXXXXXXX}'
+
+def Tup_Int(chunk):
+	return unpack("I",chunk)[0]
+
+chunks = [flag[i*4:(i+1)*4] for i in range(len(flag)//4)]
+ciphertext = ""
+
+f = open('cipher.txt','w')
+for i in range(len(chunks) - 2):
+	block = pack("I", Tup_Int(chunks[i]) ^ Tup_Int(chunks[i+2]))
+	ciphertext = 'B' + str(i) + ' : ' + str(block) + '\n'
+	f.write(ciphertext)

Challenge/cipher.txt

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+B0 : b'\nQ&4'
+B1 : b"\x17'\x0e\x0f"
+B2 : b'1X5\r'
+B3 : b'072E'
+B4 : b'\x18\x00\x15/'

Challenge/exploit.py

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+
+from struct import pack, unpack
+
+def Tup_Int(chunk):
+	return unpack("I",chunk)[0]
+
+cipher = [b'\nQ&4',b"\x17'\x0e\x0f",b'1X5\r',b'072E',b'\x18\x00\x15/']
+chunks = [b'dark',b'CON{']
+flag = []
+
+for i in range(len(cipher)):
+	block = pack("I", Tup_Int(chunks[i]) ^ Tup_Int(cipher[i]))
+	chunks.append(block)
+
+for x in chunks:
+	flag.append(x.decode())
+print(''.join(flag))
+
+#flag = darkCON{n0T_Th@t_haRd_r1Ght}

Key/exploit.py

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+#!/usr/bin/env python3
+
+from Crypto.Util.number import long_to_bytes
+import gmpy2
+ct = 43472086389850415096247084780348896011812363316852707174406536413629129
+e = 3
+print(long_to_bytes(gmpy2.iroot(ct,e)[0]).decode())
+
+#KEY = Ju5t_@_K3Y

Key/getkey.txt

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+p = 147310848610710067833452759772211595299756697892124273309283511558003008852730467644332450478086759935097628336530735607168904129699752266056721879451840506481443745340509935333411835837548485362030793140972434873394072578851922470507387225635362369992377666988296887264210876834248525673247346510754984183551
+ct = 43472086389850415096247084780348896011812363316852707174406536413629129
+e = 3